belongs-to.js
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var Utils = require("./../utils")
, DataTypes = require('./../data-types')
var BelongsTo = module.exports = function(srcModel, targetModel, options) {
this.source = srcModel
this.target = targetModel
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.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: DataTypes.INTEGER }
Utils._.extend(this.source.attributes, Utils.simplifyAttributes(newAttributes))
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() {
var id = obj[self.identifier]
return self.target.find(id)
}
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) {
obj[self.identifier] = associatedObject ? associatedObject.id : null
return obj.save()
}
return this
}