belongs-to.js
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'use strict';
var Utils = require('./../utils')
, Helpers = require('./helpers')
, Transaction = require('../transaction')
, Association = require('./base')
, util = require('util');
module.exports = (function() {
var BelongsTo = function(source, target, options) {
Association.call(this);
this.associationType = 'BelongsTo';
this.source = source;
this.target = target;
this.options = options;
this.scope = options.scope;
this.isSingleAssociation = true;
this.isSelfAssociation = (this.source === this.target);
this.as = this.options.as;
if (Utils._.isObject(this.options.foreignKey)) {
this.foreignKeyAttribute = this.options.foreignKey;
this.foreignKey = this.foreignKeyAttribute.name || this.foreignKeyAttribute.fieldName;
} else {
this.foreignKeyAttribute = {};
this.foreignKey = this.options.foreignKey;
}
if (this.as) {
this.isAliased = true;
this.options.name = {
singular: this.as
};
} else {
this.as = this.target.options.name.singular;
this.options.name = this.target.options.name;
}
if (!this.options.foreignKey) {
this.options.foreignKey = Utils._.camelizeIf(
[
Utils._.underscoredIf(this.as, this.source.options.underscored),
this.target.primaryKeyAttribute
].join('_'),
!this.source.options.underscored
);
}
this.identifier = this.foreignKey || Utils._.camelizeIf(
[
Utils._.underscoredIf(this.options.name.singular, this.target.options.underscored),
this.target.primaryKeyAttribute
].join('_'),
!this.target.options.underscored
);
this.targetIdentifier = this.target.primaryKeyAttribute;
this.associationAccessor = this.as;
this.options.useHooks = options.useHooks;
// Get singular name, trying to uppercase the first letter, unless the model forbids it
var singular = Utils.uppercaseFirst(this.options.name.singular);
this.accessors = {
get: 'get' + singular,
set: 'set' + singular,
create: 'create' + singular
};
};
util.inherits(BelongsTo, Association);
// the id is in the source table
BelongsTo.prototype.injectAttributes = function() {
var newAttributes = {};
newAttributes[this.identifier] = Utils._.defaults(this.foreignKeyAttribute, { type: this.options.keyType || this.target.rawAttributes[this.targetIdentifier].type });
if (this.options.constraints !== false) {
this.options.onDelete = this.options.onDelete || 'SET NULL';
this.options.onUpdate = this.options.onUpdate || 'CASCADE';
}
Helpers.addForeignKeyConstraints(newAttributes[this.identifier], this.target, this.source, this.options);
Utils.mergeDefaults(this.source.rawAttributes, newAttributes);
this.identifierField = this.source.rawAttributes[this.identifier].field || this.identifier;
// Sync attributes and setters/getters to DAO prototype
this.source.refreshAttributes();
Helpers.checkNamingCollision(this);
return this;
};
// Add getAssociation method to the prototype of the model instance
BelongsTo.prototype.injectGetter = function(instancePrototype) {
var association = this;
instancePrototype[this.accessors.get] = function(options) {
var where = {};
where[association.targetIdentifier] = this.get(association.identifier);
options = association.target.__optClone(options) || {};
options.where = {
$and: [
options.where,
where
]
};
if (options.limit === undefined) options.limit = null;
var model = association.target;
if (options.hasOwnProperty('scope')) {
if (!options.scope) {
model = model.unscoped();
} else {
model = model.scope(options.scope);
}
}
return model.find(options);
};
return this;
};
// Add setAssociaton method to the prototype of the model instance
BelongsTo.prototype.injectSetter = function(instancePrototype) {
var association = this;
instancePrototype[this.accessors.set] = function(associatedInstance, options) {
options = options || {};
var value = associatedInstance;
if (associatedInstance instanceof association.target.Instance) {
value = associatedInstance[association.targetIdentifier];
}
this.set(association.identifier, value);
if (options.save === false) return;
options = Utils._.extend({
fields: [association.identifier],
allowNull: [association.identifier],
association: true
}, options);
// passes the changed field to save, so only that field get updated.
return this.save(options);
};
return this;
};
// Add createAssociation method to the prototype of the model instance
BelongsTo.prototype.injectCreator = function(instancePrototype) {
var association = this;
instancePrototype[this.accessors.create] = function(values, fieldsOrOptions) {
var instance = this
, options = {};
if ((fieldsOrOptions || {}).transaction instanceof Transaction) {
options.transaction = fieldsOrOptions.transaction;
}
return association.target.create(values, fieldsOrOptions).then(function(newAssociatedObject) {
return instance[association.accessors.set](newAssociatedObject, options);
});
};
return this;
};
return BelongsTo;
})();