has-one.js
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var Utils = require("./../utils")
, DataTypes = require('./../data-types')
module.exports = (function() {
var HasOne = function(srcDAO, targetDAO, options) {
this.associationType = 'HasOne'
this.source = srcDAO
this.target = targetDAO
this.options = options
this.isSelfAssociation = (this.source.tableName == this.target.tableName)
if(this.isSelfAssociation && !this.options.foreignKey && !!this.options.as) {
this.options.foreignKey = Utils._.underscoredIf(Utils.singularize(this.options.as) + "Id", this.options.underscored)
}
this.associationAccessor = this.isSelfAssociation
? Utils.combineTableNames(this.target.tableName, this.options.as || this.target.tableName)
: this.options.as || this.target.tableName
this.accessors = {
get: Utils._.camelize('get_' + (this.options.as || Utils.singularize(this.target.tableName))),
set: Utils._.camelize('set_' + (this.options.as || Utils.singularize(this.target.tableName)))
}
}
// the id is in the target table
HasOne.prototype.injectAttributes = function() {
var newAttributes = {}
this.identifier = this.options.foreignKey || Utils._.underscoredIf(Utils.singularize(this.source.tableName) + "Id", this.options.underscored)
newAttributes[this.identifier] = { type: DataTypes.INTEGER }
Utils._.defaults(this.target.rawAttributes, newAttributes)
// Sync attributes to DAO proto each time a new assoc is added
this.target.DAO.prototype.attributes = Object.keys(this.target.DAO.prototype.rawAttributes);
return this
}
HasOne.prototype.injectGetter = function(obj) {
var self = this
obj[this.accessors.get] = function(params) {
var id = this.id
, where = {}
where[self.identifier] = id
if (!Utils._.isUndefined(params)) {
if (!Utils._.isUndefined(params.attributes)) {
params = Utils._.extend({where: where}, params)
}
} else {
params = {where: where}
}
return self.target.find(params)
}
return this
}
HasOne.prototype.injectSetter = function(obj) {
var self = this
, options = self.options || {}
obj[this.accessors.set] = function(associatedObject) {
var instance = this;
return new Utils.CustomEventEmitter(function(emitter) {
instance[self.accessors.get]().success(function(oldObj) {
if(oldObj) {
oldObj[self.identifier] = null
oldObj.save()
}
if(associatedObject) {
associatedObject[self.identifier] = instance.id
associatedObject
.save()
.success(function() { emitter.emit('success', associatedObject) })
.error(function(err) { emitter.emit('error', err) })
} else {
emitter.emit('success', null)
}
})
}).run()
}
return this
}
return HasOne
})()