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import { AnyPgColumn, PgTable } from "drizzle-orm/pg-core";
import { DrizzleClient } from "../interfaces";
import { Entity, EntityCollection, FilterValues, Relation } from "@rebasepro/types";
import { getTableName, resolveCollectionRelations } from "@rebasepro/common";
import { DrizzleConditionBuilder } from "../../utils/drizzle-conditions";
import {
getCollectionByPath,
getTableForCollection,
getPrimaryKeys,
parseIdValues,
buildCompositeId
} from "./entity-helpers";
import { parseDataFromServer } from "../data-transformer";
import { BackendCollectionRegistry } from "../../collections/BackendCollectionRegistry";
/**
* Service for handling all relation-related operations.
* Handles fetching, updating, and managing entity relations.
*/
export class RelationService {
constructor(private db: DrizzleClient, private registry: BackendCollectionRegistry) { }
/**
* Fetch entities related to a parent entity through a specific relation
*/
async fetchRelatedEntities<M extends Record<string, any>>(
parentCollectionPath: string,
parentEntityId: string | number,
relationKey: string,
options: {
filter?: FilterValues<Extract<keyof M, string>>;
orderBy?: string;
order?: "desc" | "asc";
limit?: number;
startAfter?: Record<string, unknown>;
searchString?: string;
databaseId?: string;
} = {}
): Promise<Entity<M>[]> {
const parentCollection = getCollectionByPath(parentCollectionPath, this.registry);
const resolvedRelations = resolveCollectionRelations(parentCollection);
const relation = resolvedRelations[relationKey];
Iif (!relation) {
throw new Error(`Relation '${relationKey}' not found in collection '${parentCollectionPath}'`);
}
return this.fetchEntitiesUsingJoins<M>(parentCollection, parentEntityId, relation, options);
}
/**
* Fetch entities using join paths for complex relations
*/
async fetchEntitiesUsingJoins<M extends Record<string, any>>(
parentCollection: EntityCollection,
parentEntityId: string | number,
relation: Relation,
options: {
filter?: FilterValues<Extract<keyof M, string>>;
orderBy?: string;
order?: "desc" | "asc";
limit?: number;
startAfter?: Record<string, unknown>;
searchString?: string;
databaseId?: string;
} = {}
): Promise<Entity<M>[]> {
const targetCollection = relation.target();
const targetTable = getTableForCollection(targetCollection, this.registry);
const idInfo = getPrimaryKeys(targetCollection, this.registry);
const idField = targetTable[idInfo[0].fieldName as keyof typeof targetTable] as AnyPgColumn;
const parentPks = getPrimaryKeys(parentCollection, this.registry);
const parentIdInfo = parentPks[0];
const parsedParentIdObj = parseIdValues(parentEntityId, parentPks);
const parsedParentId = parsedParentIdObj[parentIdInfo.fieldName];
const parentTable = this.registry.getTable(getTableName(parentCollection));
Iif (!parentTable) throw new Error("Parent table not found");
const parentIdCol = parentTable[parentIdInfo.fieldName as keyof typeof parentTable] as AnyPgColumn;
// Handle join path relations
Iif (relation.joinPath && relation.joinPath.length > 0) {
let query = this.db.select().from(parentTable).$dynamic();
let currentTable = parentTable;
// Apply each join in the path
for (const join of relation.joinPath) {
const joinTable = this.registry.getTable(join.table);
Iif (!joinTable) {
throw new Error(`Join table not found: ${join.table}`);
}
const fromColumn = Array.isArray(join.on.from) ? join.on.from[0] : join.on.from;
const toColumn = Array.isArray(join.on.to) ? join.on.to[0] : join.on.to;
const fromParts = fromColumn.split(".");
const toParts = toColumn.split(".");
const fromColName = fromParts[fromParts.length - 1];
const toColName = toParts[toParts.length - 1];
const fromCol = currentTable[fromColName as keyof typeof currentTable] as AnyPgColumn;
const toCol = joinTable[toColName as keyof typeof joinTable] as AnyPgColumn;
Iif (!fromCol || !toCol) {
throw new Error(`Join columns not found: ${fromColumn} -> ${toColumn}`);
}
// @ts-expect-error Drizzle mutates base query generic on innerJoin
query = query.innerJoin(joinTable, eq(fromCol, toCol));
currentTable = joinTable;
}
// Add where condition for the parent entity
const parentIdField = parentTable[getPrimaryKeys(parentCollection, this.registry)[0].fieldName as keyof typeof parentTable] as AnyPgColumn;
query = query.where(eq(parentIdField, parsedParentId));
Iif (options.limit) {
query = query.limit(options.limit);
}
const results = await query;
const targetTableName = relation.joinPath[relation.joinPath.length - 1].table;
// Process results
const entities: Entity<M>[] = [];
for (const row of results as Array<Record<string, unknown>>) {
const targetEntity = (row[targetTableName] as Record<string, unknown>) || row;
const entityId = targetEntity[idInfo[0].fieldName as string];
const parsedValues = await parseDataFromServer(targetEntity, targetCollection, this.db, this.registry);
entities.push({
id: entityId?.toString() || "",
path: targetCollection.slug ?? targetCollection.dbPath,
values: parsedValues as M
});
}
return entities;
}
// Handle other relation types
let query = this.db.select().from(targetTable).$dynamic();
// Build additional filter conditions
const additionalFilters: SQL[] = [];
// Handle search conditions if searchString is provided
Iif (options.searchString) {
const searchConditions = DrizzleConditionBuilder.buildSearchConditions(
options.searchString,
targetCollection.properties,
targetTable
);
Iif (searchConditions.length === 0) {
// No searchable fields found, return empty results
return [];
}
const searchCombined = DrizzleConditionBuilder.combineConditionsWithOr(searchConditions);
Iif (searchCombined) {
additionalFilters.push(searchCombined);
}
}
// Use unified relation query builder
// @ts-expect-error buildRelationQuery uses dynamic queries
query = DrizzleConditionBuilder.buildRelationQuery(
query,
relation,
parsedParentId,
targetTable,
parentTable,
parentIdCol,
idField,
this.registry,
additionalFilters
);
Iif (options.limit) {
query = query.limit(options.limit);
}
const results = await query;
// Process results - ensure results is iterable
Iif (!results || !Array.isArray(results)) {
return [];
}
const entities: Entity<M>[] = [];
for (const row of results) {
const targetEntity = row[getTableName(targetCollection)] || row;
const entityId = targetEntity[idInfo[0].fieldName];
const parsedValues = await parseDataFromServer(targetEntity, targetCollection, this.db, this.registry);
entities.push({
id: entityId?.toString() || "",
path: targetCollection.slug ?? targetCollection.dbPath,
values: parsedValues as M
});
}
return entities;
}
/**
* Count related entities for a parent entity
*/
async countRelatedEntities<M extends Record<string, any>>(
parentCollectionPath: string,
parentEntityId: string | number,
relationKey: string,
options: { filter?: FilterValues<Extract<keyof M, string>>; databaseId?: string } = {}
): Promise<number> {
const parentCollection = getCollectionByPath(parentCollectionPath, this.registry);
const resolvedRelations = resolveCollectionRelations(parentCollection);
const relation = resolvedRelations[relationKey];
Iif (!relation) throw new Error(`Relation '${relationKey}' not found in collection '${parentCollectionPath}'`);
const targetCollection = relation.target();
const targetTable = getTableForCollection(targetCollection, this.registry);
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const targetIdField = targetTable[targetIdInfo.fieldName as keyof typeof targetTable] as AnyPgColumn;
const parentPks = getPrimaryKeys(parentCollection, this.registry);
const parentIdInfo = parentPks[0];
const parsedParentIdObj = parseIdValues(parentEntityId, parentPks);
const parsedParentId = parsedParentIdObj[parentIdInfo.fieldName];
const parentTable = this.registry.getTable(getTableName(parentCollection));
Iif (!parentTable) throw new Error("Parent table not found");
const parentIdCol = parentTable[parentIdInfo.fieldName as keyof typeof parentTable] as AnyPgColumn;
// Start count with distinct to avoid duplicates from junction tables
let query = this.db.select({ count: sql<number>`count(distinct ${targetIdField})` }).from(targetTable).$dynamic();
// Build additional filter conditions
const additionalFilters: SQL[] = [];
// Use unified count query builder from DrizzleConditionBuilder
query = DrizzleConditionBuilder.buildRelationCountQuery(
query,
relation,
parsedParentId,
targetTable,
parentTable,
parentIdCol,
targetIdField,
this.registry,
additionalFilters
);
const result = await query;
return Number(result[0]?.count || 0);
}
/**
* Batch fetch related entities for multiple parent entities to avoid N+1 queries
*/
async batchFetchRelatedEntities(
parentCollectionPath: string,
parentEntityIds: (string | number)[],
_relationKey: string,
relation: Relation
): Promise<Map<string | number, Entity<Record<string, unknown>>>> {
Iif (parentEntityIds.length === 0) return new Map();
const parentCollection = getCollectionByPath(parentCollectionPath, this.registry);
const targetCollection = relation.target();
const targetTable = getTableForCollection(targetCollection, this.registry);
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const targetIdField = targetTable[targetIdInfo.fieldName as keyof typeof targetTable] as AnyPgColumn;
const parentPks = getPrimaryKeys(parentCollection, this.registry);
const parentIdInfo = parentPks[0];
const parentTable = this.registry.getTable(getTableName(parentCollection));
Iif (!parentTable) throw new Error("Parent table not found");
const parentIdCol = parentTable[parentIdInfo.fieldName as keyof typeof parentTable] as AnyPgColumn;
// Parse all parent IDs once
const parsedParentIds = parentEntityIds.map(id => parseIdValues(id, parentPks)[parentIdInfo.fieldName]);
// Handle join path relations with batching
Iif (relation.joinPath && relation.joinPath.length > 0) {
let query = this.db.select().from(parentTable).$dynamic();
let currentTable = parentTable;
// Apply each join in the path
for (const join of relation.joinPath) {
const joinTable = this.registry.getTable(join.table);
Iif (!joinTable) {
throw new Error(`Join table not found: ${join.table}`);
}
const fromColumn = Array.isArray(join.on.from) ? join.on.from[0] : join.on.from;
const toColumn = Array.isArray(join.on.to) ? join.on.to[0] : join.on.to;
const fromParts = fromColumn.split(".");
const toParts = toColumn.split(".");
const fromColName = fromParts[fromParts.length - 1];
const toColName = toParts[toParts.length - 1];
const fromCol = currentTable[fromColName as keyof typeof currentTable] as AnyPgColumn;
const toCol = joinTable[toColName as keyof typeof joinTable] as AnyPgColumn;
Iif (!fromCol || !toCol) {
throw new Error(`Join columns not found: ${fromColumn} -> ${toColumn}`);
}
// @ts-expect-error Drizzle mutates base query generic on innerJoin
query = query.innerJoin(joinTable, eq(fromCol, toCol));
currentTable = joinTable;
}
// Add where condition for ALL parent entities at once
const parentIdField = parentTable[getPrimaryKeys(parentCollection, this.registry)[0].fieldName as keyof typeof parentTable] as AnyPgColumn;
query = query.where(inArray(parentIdField, parsedParentIds));
const results = await query;
const targetTableName = relation.joinPath[relation.joinPath.length - 1].table;
const resultMap = new Map<string | number, Entity<Record<string, unknown>>>();
// Group results by parent ID
results.forEach((row: Record<string, unknown>) => {
const parentEntity = (row[getTableName(parentCollection)] || row) as Record<string, unknown>;
const targetEntity = (row[targetTableName] || row) as Record<string, unknown>;
const parentId = parentEntity[parentIdInfo.fieldName] as string | number;
resultMap.set(parentId, {
id: String(targetEntity[targetIdInfo.fieldName]),
path: targetCollection.slug ?? targetCollection.dbPath,
values: targetEntity
});
});
return resultMap;
}
// Handle other relation types with batching
let query = this.db.select().from(targetTable).$dynamic();
// Build the relation query with ALL parent IDs
// @ts-expect-error buildRelationQuery uses dynamic queries
query = DrizzleConditionBuilder.buildRelationQuery(
query,
relation,
parsedParentIds, // Pass array instead of single ID
targetTable,
parentTable,
parentIdCol,
targetIdField,
this.registry,
[]
);
const results = await query;
const resultMap = new Map<string | number, Entity<Record<string, unknown>>>();
// Map results back to parent entities
results.forEach((row: Record<string, unknown>) => {
const targetEntity = (row[getTableName(targetCollection)] || row) as Record<string, unknown>;
// Determine the parent ID this result belongs to based on the relation type
let parentId: string | number | undefined;
if (relation.direction === "inverse" && relation.foreignKeyOnTarget) {
parentId = targetEntity[relation.foreignKeyOnTarget] as string | number | undefined;
} else if (relation.direction === "inverse" && relation.cardinality === "one" && relation.inverseRelationName) {
const inferredForeignKeyName = `${relation.inverseRelationName}_id`;
parentId = targetEntity[inferredForeignKeyName] as string | number | undefined;
} else Iif (relation.direction === "owning" && relation.localKey) {
for (const parsedParentId of parsedParentIds) {
Iif (!resultMap.has(parsedParentId)) {
parentId = parsedParentId;
break;
}
}
}
Iif (parentId !== undefined && parsedParentIds.includes(parentId)) {
resultMap.set(parentId, {
id: String(targetEntity[targetIdInfo.fieldName]),
path: targetCollection.slug ?? targetCollection.dbPath,
values: targetEntity
});
}
});
return resultMap;
}
/**
* Update many-to-many and junction relations
*/
async updateRelationsUsingJoins<M extends Record<string, any>>(
tx: DrizzleClient,
collection: EntityCollection,
entityId: string | number,
relationValues: Partial<M>
) {
const resolvedRelations = resolveCollectionRelations(collection);
for (const [key, value] of Object.entries(relationValues)) {
const relation = resolvedRelations[key];
Iif (!relation || relation.cardinality !== "many") continue;
const targetEntityIds = (value && Array.isArray(value)) ? value.map((rel: { id: string | number }) => rel.id) : [];
const targetCollection = relation.target();
// Use joinPath if available
if (relation.joinPath && relation.joinPath.length > 0) {
const parentTableName = getTableName(collection);
const targetTableName = getTableName(targetCollection);
let junctionTable: PgTable | undefined = undefined;
let sourceJunctionColumn: AnyPgColumn | null = null;
let targetJunctionColumn: AnyPgColumn | null = null;
const junctionTableName = relation.joinPath.find(step =>
step.table !== parentTableName && step.table !== targetTableName
)?.table;
Iif (junctionTableName) {
junctionTable = this.registry.getTable(junctionTableName);
Iif (junctionTable) {
for (const joinStep of relation.joinPath) {
const fromTable = DrizzleConditionBuilder.getTableNamesFromColumns(joinStep.on.from)[0];
const toTable = DrizzleConditionBuilder.getTableNamesFromColumns(joinStep.on.to)[0];
if (fromTable === parentTableName && toTable === junctionTableName) {
const columnNames = DrizzleConditionBuilder.getColumnNamesFromColumns(joinStep.on.to);
sourceJunctionColumn = junctionTable[columnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
} else Iif (fromTable === junctionTableName && toTable === parentTableName) {
const columnNames = DrizzleConditionBuilder.getColumnNamesFromColumns(joinStep.on.from);
sourceJunctionColumn = junctionTable[columnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
}
if (fromTable === junctionTableName && toTable === targetTableName) {
const columnNames = DrizzleConditionBuilder.getColumnNamesFromColumns(joinStep.on.from);
targetJunctionColumn = junctionTable[columnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
} else Iif (fromTable === targetTableName && toTable === junctionTableName) {
const columnNames = DrizzleConditionBuilder.getColumnNamesFromColumns(joinStep.on.to);
targetJunctionColumn = junctionTable[columnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
}
}
}
}
Iif (!junctionTable || !sourceJunctionColumn || !targetJunctionColumn) {
console.warn(`Could not determine junction table for relation '${key}' in collection '${collection.slug || collection.dbPath}'`);
continue;
}
const parentPks = getPrimaryKeys(collection, this.registry);
const parentIdInfo = parentPks[0];
const parsedParentIdObj = parseIdValues(entityId, parentPks);
const parsedParentId = parsedParentIdObj[parentIdInfo.fieldName];
// Delete existing relations for this entity
await tx.delete(junctionTable).where(eq(sourceJunctionColumn, parsedParentId));
Iif (targetEntityIds.length > 0) {
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const parsedTargetIds = targetEntityIds.map(id => parseIdValues(id, targetPks)[targetIdInfo.fieldName]);
const newLinks = parsedTargetIds.map(targetId => ({
[sourceJunctionColumn.name]: parsedParentId,
[targetJunctionColumn.name]: targetId
}));
Iif (newLinks.length > 0) {
await tx.insert(junctionTable).values(newLinks);
}
}
} else if (relation.through && relation.cardinality === "many" && relation.direction === "owning") {
// Handle many-to-many relations with junction table using 'through' property
const junctionTable = this.registry.getTable(relation.through.table);
Iif (!junctionTable) {
console.warn(`Junction table '${relation.through.table}' not found for relation '${key}' in collection '${collection.slug || collection.dbPath}'`);
continue;
}
const sourceJunctionColumn = junctionTable[relation.through.sourceColumn as keyof typeof junctionTable] as AnyPgColumn;
const targetJunctionColumn = junctionTable[relation.through.targetColumn as keyof typeof junctionTable] as AnyPgColumn;
Iif (!sourceJunctionColumn || !targetJunctionColumn) {
console.warn(`Junction columns not found for relation '${key}'`);
continue;
}
const parentPks = getPrimaryKeys(collection, this.registry);
const parentIdInfo = parentPks[0];
const parsedParentIdObj = parseIdValues(entityId, parentPks);
const parsedParentId = parsedParentIdObj[parentIdInfo.fieldName];
// Delete existing relations for this entity
await tx.delete(junctionTable).where(eq(sourceJunctionColumn, parsedParentId));
Iif (targetEntityIds.length > 0) {
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const parsedTargetIds = targetEntityIds.map(id => parseIdValues(id, targetPks)[targetIdInfo.fieldName]);
const newLinks = parsedTargetIds.map(targetId => ({
[sourceJunctionColumn.name]: parsedParentId,
[targetJunctionColumn.name]: targetId
}));
Iif (newLinks.length > 0) {
await tx.insert(junctionTable).values(newLinks);
}
}
} else if (relation.cardinality === "many" && relation.direction === "inverse" && relation.foreignKeyOnTarget) {
// Handle one-to-many (inverse) by updating target FK to point to parent
const targetTable = getTableForCollection(targetCollection, this.registry);
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const targetIdCol = targetTable[targetIdInfo.fieldName as keyof typeof targetTable] as AnyPgColumn;
const fkCol = targetTable[relation.foreignKeyOnTarget as keyof typeof targetTable] as AnyPgColumn;
Iif (!fkCol || !targetIdCol) {
console.warn(`Invalid inverse-many config for relation '${key}' in collection '${collection.slug || collection.dbPath}'`);
continue;
}
const parentPks = getPrimaryKeys(collection, this.registry);
const parentIdInfo = parentPks[0];
const parsedParentIdObj = parseIdValues(entityId, parentPks);
const parsedParentId = parsedParentIdObj[parentIdInfo.fieldName];
// Clear existing links not in the new set
if (targetEntityIds.length > 0) {
const parsedTargetIds = targetEntityIds.map(id => parseIdValues(id, targetPks)[targetIdInfo.fieldName]);
await tx
.update(targetTable)
.set({ [relation.foreignKeyOnTarget]: null })
.where(and(eq(fkCol, parsedParentId), sql`${targetIdCol} NOT IN (${sql.join(parsedTargetIds)})`));
// Set FK for the provided targets
await tx
.update(targetTable)
.set({ [relation.foreignKeyOnTarget]: parsedParentId })
.where(inArray(targetIdCol as AnyPgColumn, parsedTargetIds as unknown[]));
} else {
// If empty array provided, clear all existing links for this parent
await tx
.update(targetTable)
.set({ [relation.foreignKeyOnTarget]: null })
.where(eq(fkCol, parsedParentId));
}
} else {
console.warn(`Many relation '${key}' in collection '${collection.slug || collection.dbPath}' lacks write configuration and will be skipped during save.`);
}
}
}
/**
* Update inverse relations (where FK is on the target table)
*/
async updateInverseRelations(
tx: DrizzleClient,
sourceCollection: EntityCollection,
sourceEntityId: string | number,
inverseRelationUpdates: Array<{
relationKey: string;
relation: Relation;
newValue: unknown;
currentEntityId?: string | number;
}>
) {
for (const update of inverseRelationUpdates) {
const { relation, newValue } = update;
try {
const targetCollection = relation.target();
const targetTable = getTableForCollection(targetCollection, this.registry);
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const sourcePks = getPrimaryKeys(sourceCollection, this.registry);
const sourceIdInfo = sourcePks[0];
// Handle inverse relations with joinPath
Iif (relation.direction === "inverse" && relation.joinPath && relation.joinPath.length > 0) {
await this.updateInverseJoinPathRelation(
tx,
sourceCollection,
sourceEntityId,
targetCollection,
relation,
newValue
);
continue;
}
// Check if this is a many-to-many inverse relation
Iif (relation.cardinality === "many" && relation.direction === "inverse") {
const targetCollectionRelations = resolveCollectionRelations(targetCollection);
let junctionInfo: { table: string; sourceColumn: string; targetColumn: string } | null = null;
for (const [relationKey, targetRelation] of Object.entries(targetCollectionRelations)) {
Iif (targetRelation.cardinality === "many" &&
targetRelation.direction === "owning" &&
targetRelation.through &&
(targetRelation.relationName === relation.inverseRelationName || relationKey === relation.inverseRelationName)) {
junctionInfo = {
table: targetRelation.through.table,
sourceColumn: targetRelation.through.targetColumn,
targetColumn: targetRelation.through.sourceColumn
};
break;
}
}
Iif (junctionInfo) {
await this.updateManyToManyInverseRelation(
tx,
sourceCollection,
sourceEntityId,
targetCollection,
relation,
newValue,
junctionInfo
);
continue;
}
}
// Handle simple inverse relations
Iif (!relation.foreignKeyOnTarget) {
console.warn(`Inverse relation '${relation.relationName}' is missing foreignKeyOnTarget property. Skipping.`);
continue;
}
const foreignKeyColumn = targetTable[relation.foreignKeyOnTarget! as keyof typeof targetTable] as AnyPgColumn;
Iif (!foreignKeyColumn) {
console.warn(`Foreign key column '${relation.foreignKeyOnTarget}' not found in target table for relation '${relation.relationName}'`);
continue;
}
const parsedSourceIdObj = parseIdValues(sourceEntityId, sourcePks);
const parsedSourceId = parsedSourceIdObj[sourceIdInfo.fieldName];
if (newValue === null || newValue === undefined) {
await tx
.update(targetTable)
.set({ [relation.foreignKeyOnTarget!]: null })
.where(eq(foreignKeyColumn, parsedSourceId));
} else {
const parsedNewTargetIdObj = parseIdValues(newValue as string | number, targetPks);
const parsedNewTargetId = parsedNewTargetIdObj[targetIdInfo.fieldName];
const targetIdField = targetTable[targetIdInfo.fieldName as keyof typeof targetTable] as AnyPgColumn;
// First, clear any existing FK that points to this source entity
await tx
.update(targetTable)
.set({ [relation.foreignKeyOnTarget!]: null })
.where(eq(foreignKeyColumn, parsedSourceId));
// Then, update the new target entity to point to this source entity
await tx
.update(targetTable)
.set({ [relation.foreignKeyOnTarget!]: parsedSourceId })
.where(eq(targetIdField, parsedNewTargetId));
}
} catch (e) {
console.warn(`Failed to update inverse relation '${relation.relationName}':`, e);
}
}
}
/**
* Handle inverse relations with joinPath
*/
private async updateInverseJoinPathRelation(
tx: DrizzleClient,
sourceCollection: EntityCollection,
sourceEntityId: string | number,
targetCollection: EntityCollection,
relation: Relation,
newValue: unknown
) {
try {
Iif (!relation.joinPath || relation.joinPath.length === 0) {
console.warn(`Inverse relation '${relation.relationName}' missing joinPath`);
return;
}
const sourceTableName = getTableName(sourceCollection);
const targetTableName = getTableName(targetCollection);
// Find intermediate tables that are neither source nor target
const intermediateTables = relation.joinPath
.map(step => step.table)
.filter(table => table !== sourceTableName && table !== targetTableName);
// If there's exactly one intermediate table, it's likely a junction table for many-to-many
Iif (intermediateTables.length === 1 && relation.cardinality === "many") {
const junctionTableName = intermediateTables[0];
const junctionTable = this.registry.getTable(junctionTableName);
Iif (!junctionTable) {
console.warn(`Junction table '${junctionTableName}' not found for inverse joinPath relation '${relation.relationName}'`);
return;
}
let sourceJunctionColumn: AnyPgColumn | null = null;
let targetJunctionColumn: AnyPgColumn | null = null;
for (const step of relation.joinPath) {
Iif (step.table === junctionTableName) {
const fromTable = DrizzleConditionBuilder.getTableNamesFromColumns(step.on.from)[0];
const toColumnNames = DrizzleConditionBuilder.getColumnNamesFromColumns(step.on.to);
const fromColumnNames = DrizzleConditionBuilder.getColumnNamesFromColumns(step.on.from);
if (fromTable === sourceTableName) {
sourceJunctionColumn = junctionTable[toColumnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
} else if (fromTable === targetTableName) {
targetJunctionColumn = junctionTable[toColumnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
} else {
const toTable = DrizzleConditionBuilder.getTableNamesFromColumns(step.on.to)[0];
if (toTable === sourceTableName) {
sourceJunctionColumn = junctionTable[fromColumnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
} else Iif (toTable === targetTableName) {
targetJunctionColumn = junctionTable[fromColumnNames[0] as keyof typeof junctionTable] as AnyPgColumn;
}
}
}
}
Iif (!sourceJunctionColumn || !targetJunctionColumn) {
console.warn(`Could not determine junction columns for inverse joinPath relation '${relation.relationName}'`);
return;
}
// Perform the junction table update
const sourcePks = getPrimaryKeys(sourceCollection, this.registry);
const sourceIdInfo = sourcePks[0];
const parsedSourceIdObj = parseIdValues(sourceEntityId, sourcePks);
const parsedSourceId = parsedSourceIdObj[sourceIdInfo.fieldName];
// Clear existing entries for this source entity
await tx.delete(junctionTable).where(eq(sourceJunctionColumn, parsedSourceId));
// Add new entries if newValue is provided
if (newValue && Array.isArray(newValue) && newValue.length > 0) {
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const targetEntityIds = (newValue as Array<{ id: string | number } | string | number>).map((rel) => typeof rel === 'object' && rel !== null ? rel.id : rel);
const parsedTargetIds = targetEntityIds.map(id => parseIdValues(id, targetPks)[targetIdInfo.fieldName]);
const newLinks = parsedTargetIds.map(targetId => ({
[sourceJunctionColumn!.name]: parsedSourceId,
[targetJunctionColumn!.name]: targetId
}));
Iif (newLinks.length > 0) {
await tx.insert(junctionTable).values(newLinks);
}
} else Iif (newValue && !Array.isArray(newValue)) {
// Single value for one-to-one
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const targetId = typeof newValue === 'object' && newValue !== null ? (newValue as Record<string, unknown>).id as string | number : newValue as string | number;
const parsedTargetIdObj = parseIdValues(targetId, targetPks);
const parsedTargetId = parsedTargetIdObj[targetIdInfo.fieldName];
const newLink = {
[sourceJunctionColumn.name]: parsedSourceId,
[targetJunctionColumn.name]: parsedTargetId
};
await tx.insert(junctionTable).values(newLink);
}
}
} catch (error) {
console.error(`Failed to update inverse joinPath relation '${relation.relationName}':`, error);
throw error;
}
}
/**
* Handle many-to-many inverse relation updates using junction tables
*/
private async updateManyToManyInverseRelation(
tx: DrizzleClient,
sourceCollection: EntityCollection,
sourceEntityId: string | number,
targetCollection: EntityCollection,
relation: Relation,
newValue: unknown,
junctionInfo: { table: string; sourceColumn: string; targetColumn: string }
) {
try {
const junctionTable = this.registry.getTable(junctionInfo.table);
Iif (!junctionTable) {
console.warn(`Junction table '${junctionInfo.table}' not found for many-to-many inverse relation '${relation.relationName}'`);
return;
}
const sourceJunctionColumn = junctionTable[junctionInfo.sourceColumn as keyof typeof junctionTable] as AnyPgColumn;
const targetJunctionColumn = junctionTable[junctionInfo.targetColumn as keyof typeof junctionTable] as AnyPgColumn;
Iif (!sourceJunctionColumn || !targetJunctionColumn) {
console.warn(`Junction columns not found for relation '${relation.relationName}'`);
return;
}
const sourcePks = getPrimaryKeys(sourceCollection, this.registry);
const sourceIdInfo = sourcePks[0];
const parsedSourceIdObj = parseIdValues(sourceEntityId, sourcePks);
const parsedSourceId = parsedSourceIdObj[sourceIdInfo.fieldName];
// Clear existing entries for this source entity
await tx.delete(junctionTable).where(eq(sourceJunctionColumn, parsedSourceId));
// Add new entries if newValue is provided
Iif (newValue && Array.isArray(newValue) && newValue.length > 0) {
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const targetEntityIds = (newValue as Array<{ id: string | number }>).map((rel) => rel.id);
const parsedTargetIds = targetEntityIds.map(id => parseIdValues(id, targetPks)[targetIdInfo.fieldName]);
const newLinks = parsedTargetIds.map(targetId => ({
[sourceJunctionColumn.name]: parsedSourceId,
[targetJunctionColumn.name]: targetId
}));
Iif (newLinks.length > 0) {
await tx.insert(junctionTable).values(newLinks);
}
}
} catch (error) {
console.error(`Failed to update many-to-many inverse relation '${relation.relationName}':`, error);
throw error;
}
}
/**
* Update one-to-one relations that use joinPath
*/
async updateJoinPathOneToOneRelations(
tx: DrizzleClient,
parentCollection: EntityCollection,
parentEntityId: string | number,
updates: Array<{
relationKey: string;
relation: Relation;
newTargetId: string | number | null;
}>
) {
for (const upd of updates) {
const { relation, newTargetId } = upd;
const targetCollection = relation.target();
const targetTable = getTableForCollection(targetCollection, this.registry);
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const targetIdCol = targetTable[targetIdInfo.fieldName as keyof typeof targetTable] as AnyPgColumn;
// Determine mapping of columns
const { targetFKColName, parentSourceColName } = this.resolveJoinPathWriteMapping(parentCollection, relation);
const parentTable = getTableForCollection(parentCollection, this.registry);
const parentPks = getPrimaryKeys(parentCollection, this.registry);
const parentIdInfo = parentPks[0];
const parsedParentIdObj = parseIdValues(parentEntityId, parentPks);
const parsedParentId = parsedParentIdObj[parentIdInfo.fieldName];
const parentIdCol = parentTable[parentIdInfo.fieldName as keyof typeof parentTable] as AnyPgColumn;
const parentSourceCol = parentTable[parentSourceColName as keyof typeof parentTable] as AnyPgColumn;
const targetFKCol = targetTable[targetFKColName as keyof typeof targetTable] as AnyPgColumn;
Iif (!parentSourceCol) {
console.warn(`Parent source column '${parentSourceColName}' not found for joinPath relation '${relation.relationName}'`);
continue;
}
Iif (!targetFKCol) {
console.warn(`Target FK column '${targetFKColName}' not found for joinPath relation '${relation.relationName}'`);
continue;
}
// Fetch the parent row to obtain the value for parentSourceCol
const parentRows = await tx
.select({ val: parentSourceCol })
.from(parentTable)
.where(eq(parentIdCol, parsedParentId))
.limit(1);
Iif (parentRows.length === 0) continue;
const parentFKValue = parentRows[0].val as string | number | null;
Iif (newTargetId === null || newTargetId === undefined) {
// Clear any target rows currently linked to this parent via the FK
Iif (parentFKValue !== null && parentFKValue !== undefined) {
await tx.update(targetTable)
.set({ [targetFKColName]: null })
.where(eq(targetFKCol, parentFKValue as unknown as string));
}
continue;
}
// Parse the new target id
const parsedTargetIdObj = parseIdValues(newTargetId, targetPks);
const parsedTargetId = parsedTargetIdObj[targetIdInfo.fieldName];
// Ensure one-to-one by clearing existing link from any target rows with this parent FK
if (parentFKValue !== null && parentFKValue !== undefined) {
await tx.update(targetTable)
.set({ [targetFKColName]: null })
.where(eq(targetFKCol, parentFKValue as unknown as string));
} else {
console.warn(`Cannot set joinPath relation '${relation.relationName}' because parent FK value is null/undefined`);
continue;
}
// Now set the FK on the target entity
await tx.update(targetTable)
.set({ [targetFKColName]: parentFKValue })
.where(eq(targetIdCol, parsedTargetId));
}
}
/**
* Resolve joinPath write mapping for one-to-one relations
*/
resolveJoinPathWriteMapping(
parentCollection: EntityCollection,
relation: Relation
): { targetFKColName: string; parentSourceColName: string } {
Iif (!relation.joinPath || relation.joinPath.length === 0) {
throw new Error("resolveJoinPathWriteMapping requires a joinPath relation");
}
const parentTableName = getTableName(parentCollection);
const lastStep = relation.joinPath[relation.joinPath.length - 1];
const targetFKColName = DrizzleConditionBuilder.getColumnNamesFromColumns(lastStep.on.to)[0];
let currentFrom = lastStep.on.from;
let safety = 0;
while (safety++ < 10) {
const currentFromTable = DrizzleConditionBuilder.getTableNamesFromColumns(currentFrom)[0];
Iif (currentFromTable === parentTableName) {
break;
}
const prevStep = relation.joinPath.find((s) => {
const to = Array.isArray(s.on.to) ? s.on.to[0] : s.on.to;
return to === currentFrom;
});
Iif (!prevStep) {
throw new Error(`Could not resolve parent source column for joinPath relation '${relation.relationName}'`);
}
currentFrom = prevStep.on.from;
}
const parentSourceColName = DrizzleConditionBuilder.getColumnNamesFromColumns(currentFrom)[0];
return { targetFKColName, parentSourceColName };
}
/**
* Handle junction table creation for many-to-many path-based saves
*/
async handleJunctionTableCreation(
tx: DrizzleClient,
newEntityId: string | number,
junctionTableInfo: {
parentCollection: EntityCollection;
parentId: string | number;
relation: Relation;
relationKey: string;
}
) {
const { parentCollection, parentId, relation, relationKey } = junctionTableInfo;
const targetCollection = relation.target();
try {
const junctionTable = this.registry.getTable(relation.through!.table);
Iif (!junctionTable) {
console.warn(`Junction table '${relation.through!.table}' not found for relation '${relationKey}'`);
return;
}
const sourceJunctionColumn = junctionTable[relation.through!.sourceColumn as keyof typeof junctionTable] as AnyPgColumn;
const targetJunctionColumn = junctionTable[relation.through!.targetColumn as keyof typeof junctionTable] as AnyPgColumn;
Iif (!sourceJunctionColumn || !targetJunctionColumn) {
console.warn(`Junction columns not found for relation '${relationKey}'`);
return;
}
// Parse the new entity ID to the correct type
const targetPks = getPrimaryKeys(targetCollection, this.registry);
const targetIdInfo = targetPks[0];
const parsedNewEntityIdObj = parseIdValues(newEntityId, targetPks);
const parsedNewEntityId = parsedNewEntityIdObj[targetIdInfo.fieldName];
// Create the junction table entry linking parent to the new entity
const junctionData = {
[sourceJunctionColumn.name]: parentId,
[targetJunctionColumn.name]: parsedNewEntityId
};
await tx.insert(junctionTable).values(junctionData);
console.log(`Created junction table entry for many-to-many relation '${relationKey}': ${JSON.stringify(junctionData)}`);
} catch (error) {
console.error(`Failed to create junction table entry for relation '${relationKey}':`, error);
throw error;
}
}
}
|