has-one.js
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'use strict';
var Utils = require('./../utils')
, Helpers = require('./helpers')
, Transaction = require('../transaction');
module.exports = (function() {
var HasOne = function(srcDAO, targetDAO, options) {
this.associationType = 'HasOne';
this.source = srcDAO;
this.target = targetDAO;
this.options = options;
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.fieldName;
} else {
this.foreignKeyAttribute = {};
this.foreignKey = this.options.foreignKey;
}
if (this.as) {
this.isAliased = true;
} else {
this.as = Utils.singularize(this.target.name, this.target.options.language);
}
if (!this.options.foreignKey) {
this.options.foreignKey = Utils._.camelizeIf(
[
Utils._.underscoredIf(Utils.singularize(this.source.name, this.target.options.language), this.target.options.underscored),
this.source.primaryKeyAttribute
].join('_'),
!this.source.options.underscored
);
}
this.identifier = this.options.foreignKey;
this.sourceIdentifier = this.source.primaryKeyAttribute;
this.associationAccessor = this.as;
this.options.useHooks = options.useHooks;
this.accessors = {
get: Utils._.camelize('get_' + this.as),
set: Utils._.camelize('set_' + this.as),
create: Utils._.camelize('create_' + this.as)
};
};
// the id is in the target table
HasOne.prototype.injectAttributes = function() {
var newAttributes = {}
, keyType = this.source.rawAttributes[this.sourceIdentifier].type;
newAttributes[this.identifier] = Utils._.defaults(this.foreignKeyAttribute, { type: this.options.keyType || keyType });
Utils._.defaults(this.target.rawAttributes, newAttributes);
if (this.options.constraints !== false) {
this.options.onDelete = this.options.onDelete || 'SET NULL';
this.options.onUpdate = this.options.onUpdate || 'CASCADE';
}
Helpers.addForeignKeyConstraints(this.target.rawAttributes[this.identifier], this.source, this.target, this.options);
// Sync attributes and setters/getters to DAO prototype
this.target.refreshAttributes();
if (this.source.rawAttributes.hasOwnProperty(this.as)) {
throw new Error("Naming collision between attribute '" + this.as + "' and association '" + this.as + "' on model " + this.source.name + '. To remedy this, change either foreignKey or as in your association definition');
}
return this;
};
HasOne.prototype.injectGetter = function(instancePrototype) {
var association = this;
instancePrototype[this.accessors.get] = function(params) {
var where = {};
params = params || {};
params.where = (params.where && [params.where]) || [];
where[association.identifier] = this.get(association.sourceIdentifier);
params.where.push(where);
params.where = new Utils.and(params.where);
return association.target.find(params);
};
return this;
};
HasOne.prototype.injectSetter = function(instancePrototype) {
var association = this;
instancePrototype[this.accessors.set] = function(associatedInstance, options) {
var instance = this;
return instance[association.accessors.get](options).then(function(oldInstance) {
if (oldInstance) {
oldInstance[association.identifier] = null;
return oldInstance.save(Utils._.extend({}, options, {
fields: [association.identifier],
allowNull: [association.identifier],
association: true
}));
}
}).then(function() {
if (associatedInstance) {
if (!(associatedInstance instanceof association.target.Instance)) {
var tmpInstance = {};
tmpInstance[association.target.primaryKeyAttribute] = associatedInstance;
associatedInstance = association.target.build(tmpInstance, {
isNewRecord: false
});
}
associatedInstance.set(association.identifier, instance.get(association.sourceIdentifier));
return associatedInstance.save(options);
}
return null;
});
};
return this;
};
HasOne.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(associationInstance) {
return instance[association.accessors.set](associationInstance, options);
});
};
return this;
};
return HasOne;
})();