mevn-orm/dist/src/relationships.js

simple ORM for express js

import { BelongsToRelation, HasManyRelation, HasOneRelation, } from './relation.js';
/** Builds relationship methods that run against the active Knex instance. */
const createRelationshipMethods = (getDB) => ({
    hasOne(Related, localKey, foreignKey) {
        const table = new Related().table;
        const keyValue = localKey ?? this.id;
        const relationKey = foreignKey ?? `${this.modelName}_id`;
        if (keyValue === undefined) {
            return new HasOneRelation(Related, null);
        }
        const query = getDB()(table).where({ [relationKey]: keyValue });
        return new HasOneRelation(Related, query);
    },
    hasMany(Related, localKey, foreignKey) {
        const table = new Related().table;
        const keyValue = localKey ?? this.id;
        const relationKey = foreignKey ?? `${this.modelName}_id`;
        if (keyValue === undefined) {
            return new HasManyRelation(Related, null);
        }
        const query = getDB()(table).where({ [relationKey]: keyValue });
        return new HasManyRelation(Related, query);
    },
    belongsTo(Related, foreignKey, ownerKey = 'id') {
        const table = new Related().table;
        const relationKey = foreignKey ?? `${new Related().modelName}_id`;
        const relationValue = this[relationKey];
        if (relationValue === undefined || relationValue === null) {
            return new BelongsToRelation(Related, null);
        }
        const query = getDB()(table).where({ [ownerKey]: relationValue });
        return new BelongsToRelation(Related, query);
    },
});
export { createRelationshipMethods };