All files / src HasOneRelation.ts

89.13% Statements 41/46
64% Branches 16/25
100% Functions 7/7
89.13% Lines 41/46
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import neo4js, { ModelInstance } from "./index";
import { RelationType } from "./Relation";
 
function getRelationString(
  label: string,
  relationType: RelationType,
  variable: string = ""
) {
  return `${
    !relationType.out && !relationType.any ? "<" : ""
  }-[${variable}:${label}]-${
    !relationType.out && !relationType.any ? "" : ">"
  }`;
}
 
export async function get(
  instance: ModelInstance<any>,
  label: string,
  relationType: RelationType
): Promise<any> {
  const relationString = getRelationString(label, relationType);
  const result = await neo4js.run(
    `
    MATCH (a:${this.src.label} {guid:{_srcGuid}})${relationString}(b:${
      this.dest.label
    })
    RETURN b
  `,
    { _srcGuid: instance.props.guid }
  );
 
  if (result.length === 0) {
    return Promise.resolve(null);
  }
 
  Iif (result.length > 1) {
    return Promise.reject("hasOne has more than one relations");
  }
 
  return Promise.resolve(this.dest._createModelInstance(result[0].b));
}
 
export async function create(
  instance: ModelInstance<any>,
  label: string,
  relationType: RelationType,
  props: any
): Promise<any> {
  const destInstance = await this.dest.create(props);
 
  const relationString = getRelationString(label, relationType);
  const result = await neo4js.run(
    `
    MATCH (a:${this.src.label} {guid:{srcGuid}})${relationString}(b:${
      this.dest.label
    })
    DETACH DELETE b
  `,
    { srcGuid: instance.props.guid }
  );
 
  await neo4js.run(
    `
    MATCH
      (a:${this.src.label} {guid:{srcGuid}}),
      (b:${this.dest.label} {guid:{destGuid}})
    MERGE (a)${relationString}(b)
  `,
    { srcGuid: instance.props.guid, destGuid: destInstance.props.guid }
  );
 
  return Promise.resolve(destInstance);
}
 
export async function remove(
  instance: ModelInstance<any>,
  label: string,
  relationType: RelationType
): Promise<any> {
  const relationString = getRelationString(label, relationType, "c");
  const result = await neo4js.run(
    `
    MATCH (a:${this.src.label} {guid:{srcGuid}})${relationString}(b:${
      this.dest.label
    })
    DELETE c
    `,
    { srcGuid: instance.props.guid }
  );
 
  return Promise.resolve(result._stats);
}
 
export async function add(
  instance: ModelInstance<any>,
  label: string,
  relationType: RelationType,
  destInstance: ModelInstance<any>
): Promise<boolean> {
  const relationString = getRelationString(label, relationType);
  const result = await neo4js.run(
    `
    MATCH
      (a:${this.src.label} {guid:{srcGuid}}),
      (b:${this.dest.label} {guid:{destGuid}})
    MERGE (a)${relationString}(b)
  `,
    { srcGuid: instance.props.guid, destGuid: destInstance.props.guid }
  );
 
  Eif (result._stats.relationshipsCreated === 1) {
    return Promise.resolve(true);
  }
 
  return Promise.resolve(false);
}
 
export async function hasOne(
  instance: ModelInstance<any>,
  label: string,
  relationType: RelationType
): Promise<boolean> {
  const relationString = getRelationString(label, relationType);
  const result = await neo4js.run(
    `
    MATCH
      (a:${this.src.label} {guid:{srcGuid}})${relationString}(b:${
      this.dest.label
    })
    RETURN b
  `,
    { srcGuid: instance.props.guid }
  );
 
  if (result.length === 1) {
    return Promise.resolve(true);
  } else Iif (result.length > 1) {
    return Promise.reject(
      new Error("HasOne relation has more than one relations")
    );
  }
 
  return Promise.resolve(false);
}
 
export async function update(
  instance: ModelInstance<any>,
  label: string,
  relationType: RelationType,
  newProps: any
): Promise<any> {
  const relationString = getRelationString(label, relationType);
  let props: any = await neo4js.run(
    `
    MATCH (a:${this.src.label} {guid:{srcGuid}})${relationString}(b:${
      this.dest.label
    })
    RETURN b
  `,
    { srcGuid: instance.props.guid }
  );
 
  if (props.length === 0) {
    return Promise.resolve(true);
  } else Iif (props.length > 1) {
    return Promise.reject(
      new Error("HasOne relation has more than one relations")
    );
  }
  props = props[0].b;
 
  const destInstance = await this.dest.update({ guid: props.guid }, newProps);
  Eif (destInstance.length === 1) {
    return Promise.resolve(destInstance[0]);
  }
 
  return Promise.reject(new Error("Problem with the update"));
}