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GraphQLSchema,
GraphQLObjectType,
GraphQLString,
GraphQLInt,
GraphQLFloat,
GraphQLBoolean,
GraphQLList,
GraphQLNonNull,
GraphQLFieldConfig,
GraphQLInputObjectType,
} from "graphql";
import { DataDriver, EntityCollection, FetchCollectionProps, Property } from "@rebasepro/types";
/**
* Lightweight GraphQL schema generator that leverages existing DataDriver
* No duplication - uses your existing data layer and services
*/
export class GraphQLSchemaGenerator {
private collections: EntityCollection[];
private driver: DataDriver;
private typeRegistry = new Map<string, GraphQLObjectType>();
private inputTypeRegistry = new Map<string, GraphQLInputObjectType>();
constructor(collections: EntityCollection[], driver: DataDriver) {
this.collections = collections;
this.driver = driver;
}
/**
* Generate complete GraphQL schema using existing DataDriver
*/
generateSchema(): GraphQLSchema {
// Create all types first
this.collections.forEach(collection => {
this.createEntityType(collection);
this.createInputType(collection);
});
const queryType = this.createQueryType();
const mutationType = this.createMutationType();
return new GraphQLSchema({
query: queryType,
mutation: mutationType,
});
}
/**
* Create GraphQL type for an entity collection
*/
private createEntityType(collection: EntityCollection): GraphQLObjectType {
const typeName = this.getTypeName(collection);
Iif (this.typeRegistry.has(typeName)) {
return this.typeRegistry.get(typeName)!;
}
const fields: Record<string, GraphQLFieldConfig<any, any>> = {};
// Add ID field
fields.id = {
type: new GraphQLNonNull(GraphQLString),
description: "Unique identifier",
resolve: (source) => source.id
};
// Convert properties to GraphQL fields
Object.entries(collection.properties).forEach(([key, property]) => {
if (property.type !== "relation" && key !== "id") {
const fieldConfig = this.convertPropertyToField(property);
fieldConfig.resolve = (source) => source.values?.[key];
fields[key] = fieldConfig;
}
});
const entityType = new GraphQLObjectType({
name: typeName,
description: collection.description || `${collection.singularName} entity`,
fields: () => fields
});
this.typeRegistry.set(typeName, entityType);
return entityType;
}
private convertPropertyToField(property: Property): GraphQLFieldConfig<any, any> {
let type;
switch (property.type) {
case "string":
type = GraphQLString;
break;
case "number":
type = GraphQLFloat;
break;
case "boolean":
type = GraphQLBoolean;
break;
case "date":
type = GraphQLString;
break;
case "array":
type = new GraphQLList(GraphQLString);
break;
default:
type = GraphQLString;
}
return {
type: property.validation?.required ? new GraphQLNonNull(type) : type,
description: property.name || property.description
};
}
private createInputType(collection: EntityCollection): GraphQLInputObjectType {
const typeName = `${this.getTypeName(collection)}Input`;
Iif (this.inputTypeRegistry.has(typeName)) {
return this.inputTypeRegistry.get(typeName)!;
}
const fields: Record<string, any> = {};
Object.entries(collection.properties).forEach(([key, property]) => {
if (property.type !== "relation") {
fields[key] = {
type: this.convertPropertyToInputType(property)
};
}
});
const inputType = new GraphQLInputObjectType({
name: typeName,
description: `Input for creating/updating ${collection.singularName}`,
fields
});
this.inputTypeRegistry.set(typeName, inputType);
return inputType;
}
private convertPropertyToInputType(property: Property) {
switch (property.type) {
case "string":
return GraphQLString;
case "number":
return GraphQLFloat;
case "boolean":
return GraphQLBoolean;
case "date":
return GraphQLString;
case "array":
return new GraphQLList(GraphQLString);
default:
return GraphQLString;
}
}
/**
* Create Query type using existing DataDriver methods
*/
private createQueryType(): GraphQLObjectType {
const fields: Record<string, GraphQLFieldConfig<any, any>> = {};
this.collections.forEach(collection => {
const typeName = this.getTypeName(collection);
const entityType = this.typeRegistry.get(typeName);
Iif (!entityType) return;
// Single entity query - uses existing fetchEntity
fields[this.getSingleQueryName(collection)] = {
type: entityType,
args: {
id: { type: new GraphQLNonNull(GraphQLString) }
},
resolve: async (_, args, context: { driver: DataDriver }) => {
const ds = context.driver || this.driver;
const entity = await ds.fetchEntity({
path: collection.dbPath || collection.slug,
entityId: args.id,
collection
});
return entity;
}
};
// List query - uses existing fetchCollection
fields[this.getListQueryName(collection)] = {
type: new GraphQLList(entityType),
args: {
limit: { type: GraphQLInt, defaultValue: 20 },
offset: { type: GraphQLInt, defaultValue: 0 },
where: { type: GraphQLString },
orderBy: { type: GraphQLString }
},
resolve: async (_, args, context: { driver: DataDriver }) => {
const ds = context.driver || this.driver;
let filter: FetchCollectionProps["filter"] | undefined;
Iif (args.where) {
try {
const parsed = JSON.parse(args.where);
Iif (typeof parsed !== "object" || parsed === null || Array.isArray(parsed)) {
throw new Error("Filter must be a JSON object");
}
filter = parsed;
} catch (e) {
throw new Error(`Invalid 'where' filter: ${e instanceof Error ? e.message : "malformed JSON"}`);
}
}
const entities = await ds.fetchCollection({
path: collection.dbPath || collection.slug,
collection,
filter,
limit: args.limit,
startAfter: args.offset ? String(args.offset) : undefined
});
return entities;
}
};
});
return new GraphQLObjectType({
name: "Query",
fields
});
}
/**
* Create Mutation type using existing DataDriver methods
*/
private createMutationType(): GraphQLObjectType {
const fields: Record<string, GraphQLFieldConfig<any, any>> = {};
this.collections.forEach(collection => {
const typeName = this.getTypeName(collection);
const entityType = this.typeRegistry.get(typeName);
const inputType = this.inputTypeRegistry.get(`${typeName}Input`);
Iif (!entityType || !inputType) return;
// Create mutation - uses existing saveEntity
fields[`create${typeName}`] = {
type: entityType,
args: {
input: { type: new GraphQLNonNull(inputType) }
},
resolve: async (_, args, context: { driver: DataDriver }) => {
const ds = context.driver || this.driver;
const path = collection.dbPath || collection.slug;
const entity = await ds.saveEntity({
path,
values: args.input,
collection,
status: "new"
});
return entity;
}
};
// Update mutation - uses existing saveEntity
fields[`update${typeName}`] = {
type: entityType,
args: {
id: { type: new GraphQLNonNull(GraphQLString) },
input: { type: new GraphQLNonNull(inputType) }
},
resolve: async (_, args, context: { driver: DataDriver }) => {
const ds = context.driver || this.driver;
const entity = await ds.saveEntity({
path: collection.dbPath || collection.slug,
entityId: args.id,
values: args.input,
collection,
status: "existing"
});
return entity;
}
};
// Delete mutation - uses existing deleteEntity
fields[`delete${typeName}`] = {
type: GraphQLBoolean,
args: {
id: { type: new GraphQLNonNull(GraphQLString) }
},
resolve: async (_, args, context: { driver: DataDriver }) => {
try {
const ds = context.driver || this.driver;
const existingEntity = await ds.fetchEntity({
path: collection.dbPath || collection.slug,
entityId: args.id,
collection
});
Iif (!existingEntity) return false;
await ds.deleteEntity({
entity: existingEntity,
collection
});
return true;
} catch {
return false;
}
}
};
});
return new GraphQLObjectType({
name: "Mutation",
fields
});
}
// Helper methods
private getTypeName(collection: EntityCollection): string {
return collection.singularName?.replace(/\s+/g, "") ||
collection.name.slice(0, -1).replace(/\s+/g, "");
}
private getSingleQueryName(collection: EntityCollection): string {
return this.getTypeName(collection).toLowerCase();
}
private getListQueryName(collection: EntityCollection): string {
return collection.slug;
}
}
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