has-one.js
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var Utils = require("./../utils")
, DataTypes = require('./../data-types')
, 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 (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(
[this.source.name, 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] = { type: this.options.keyType || keyType }
Utils._.defaults(this.target.rawAttributes, newAttributes)
Helpers.addForeignKeyConstraints(this.target.rawAttributes[this.identifier], this.source, this.target, this.options)
// Sync attributes and setters/getters to DAO prototype
this.target.refreshAttributes()
return this
}
HasOne.prototype.injectGetter = function(instancePrototype) {
var association = this
instancePrototype[this.accessors.get] = function(params) {
var where = {}
params = params || {}
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 new Utils.CustomEventEmitter(function(emitter) {
instance[association.accessors.get]().success(function(oldInstance) {
if (oldInstance) {
oldInstance[association.identifier] = null
oldInstance
.save(Utils._.extend({}, options, {
fields: [association.identifier],
allowNull: [association.identifier],
association: true
}))
.success(function() {
if (associatedInstance) {
associatedInstance.set(association.identifier, instance.get(association.sourceIdentifier))
associatedInstance.save(options).proxy(emitter)
} else {
emitter.emit('success', null)
}
})
} else {
if (associatedInstance) {
associatedInstance.set(association.identifier, instance.get(association.sourceIdentifier))
associatedInstance.save(options).proxy(emitter)
} else {
emitter.emit('success', null)
}
}
})
}).run()
}
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 new Utils.CustomEventEmitter(function(emitter) {
association.target
.create(values, fieldsOrOptions)
.proxy(emitter, { events: ['error', 'sql'] })
.success(function(associationInstance) {
instance[association.accessors.set](associationInstance, options)
.proxy(emitter)
})
}).run()
}
return this
};
return HasOne
})()