belongs-to.js
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var Utils = require("./../utils")
, DataTypes = require('./../data-types')
, Helpers = require('./helpers')
module.exports = (function() {
var BelongsTo = function(srcDAO, targetDAO, options) {
this.associationType = 'BelongsTo'
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.source.options.underscored)
}
this.associationAccessor = this.isSelfAssociation
? Utils.combineTableNames(this.target.tableName, this.options.as || this.target.tableName)
: this.options.as || this.target.tableName
}
// the id is in the source table
BelongsTo.prototype.injectAttributes = function() {
var newAttributes = {}
this.identifier = this.options.foreignKey || Utils._.underscoredIf(Utils.singularize(this.target.tableName) + "Id", this.source.options.underscored)
newAttributes[this.identifier] = { type: this.options.keyType || DataTypes.INTEGER }
Helpers.addForeignKeyConstraints(newAttributes[this.identifier], this.target, this.source, this.options)
Utils._.defaults(this.source.rawAttributes, newAttributes)
// Sync attributes to DAO proto each time a new assoc is added
this.source.DAO.prototype.attributes = Object.keys(this.source.DAO.prototype.rawAttributes);
return this
}
BelongsTo.prototype.injectGetter = function(obj) {
var self = this
, accessor = Utils._.camelize('get_' + (this.options.as || Utils.singularize(this.target.tableName)))
obj[accessor] = function(params) {
var id = this[self.identifier]
if (!Utils._.isUndefined(params)) {
if (!Utils._.isUndefined(params.where)) {
params.where = Utils._.extend({id:id}, params.where)
} else {
params.where = {id: id}
}
} else {
params = id
}
return self.target.find(params)
}
return this
}
BelongsTo.prototype.injectSetter = function(obj) {
var self = this
, accessor = Utils._.camelize('set_' + (this.options.as || Utils.singularize(this.target.tableName)))
obj[accessor] = function(associatedObject) {
this[self.identifier] = associatedObject ? associatedObject.id : null
// passes the changed field to save, so only that field get updated.
return this.save([ self.identifier ])
}
return this
}
return BelongsTo
})()