sequelize/lib/associations/mixin.js

Sequelize is a promise-based Node.js ORM tool for Postgres, MySQL, MariaDB, SQLite, Microsoft SQL Server, Amazon Redshift and Snowflake’s Data Cloud. It features solid transaction support, relations, eager and lazy loading, read replication and more.

"use strict";
const _ = require("lodash");
const HasOne = require("./has-one");
const HasMany = require("./has-many");
const BelongsToMany = require("./belongs-to-many");
const BelongsTo = require("./belongs-to");
function isModel(model, sequelize) {
  return model && model.prototype && model.prototype instanceof sequelize.Sequelize.Model;
}
const Mixin = {
  hasMany(target, options = {}) {
    if (!isModel(target, this.sequelize)) {
      throw new Error(`${this.name}.hasMany called with something that's not a subclass of Sequelize.Model`);
    }
    const source = this;
    options.hooks = options.hooks === void 0 ? false : Boolean(options.hooks);
    options.useHooks = options.hooks;
    Object.assign(options, _.omit(source.options, ["hooks"]));
    if (options.useHooks) {
      this.runHooks("beforeAssociate", { source, target, type: HasMany }, options);
    }
    const association = new HasMany(source, target, options);
    source.associations[association.associationAccessor] = association;
    association._injectAttributes();
    association.mixin(source.prototype);
    if (options.useHooks) {
      this.runHooks("afterAssociate", { source, target, type: HasMany, association }, options);
    }
    return association;
  },
  belongsToMany(target, options = {}) {
    if (!isModel(target, this.sequelize)) {
      throw new Error(`${this.name}.belongsToMany called with something that's not a subclass of Sequelize.Model`);
    }
    const source = this;
    options.hooks = options.hooks === void 0 ? false : Boolean(options.hooks);
    options.useHooks = options.hooks;
    options.timestamps = options.timestamps === void 0 ? this.sequelize.options.timestamps : options.timestamps;
    Object.assign(options, _.omit(source.options, ["hooks", "timestamps", "scopes", "defaultScope"]));
    if (options.useHooks) {
      this.runHooks("beforeAssociate", { source, target, type: BelongsToMany }, options);
    }
    const association = new BelongsToMany(source, target, options);
    source.associations[association.associationAccessor] = association;
    association._injectAttributes();
    association.mixin(source.prototype);
    if (options.useHooks) {
      this.runHooks("afterAssociate", { source, target, type: BelongsToMany, association }, options);
    }
    return association;
  },
  getAssociations(target) {
    return Object.values(this.associations).filter((association) => association.target.name === target.name);
  },
  getAssociationForAlias(target, alias) {
    return this.getAssociations(target).find((association) => association.verifyAssociationAlias(alias)) || null;
  }
};
function singleLinked(Type) {
  return function(target, options = {}) {
    const source = this;
    if (!isModel(target, source.sequelize)) {
      throw new Error(`${source.name}.${_.lowerFirst(Type.name)} called with something that's not a subclass of Sequelize.Model`);
    }
    options.hooks = options.hooks === void 0 ? false : Boolean(options.hooks);
    options.useHooks = options.hooks;
    if (options.useHooks) {
      source.runHooks("beforeAssociate", { source, target, type: Type }, options);
    }
    const association = new Type(source, target, Object.assign(options, source.options));
    source.associations[association.associationAccessor] = association;
    association._injectAttributes();
    association.mixin(source.prototype);
    if (options.useHooks) {
      source.runHooks("afterAssociate", { source, target, type: Type, association }, options);
    }
    return association;
  };
}
Mixin.hasOne = singleLinked(HasOne);
Mixin.belongsTo = singleLinked(BelongsTo);
module.exports = Mixin;
module.exports.Mixin = Mixin;
module.exports.default = Mixin;
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