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| /*!
* mongoskin - collection.js
*
* Copyright(c) 2011 - 2012 kissjs.org
* Copyright(c) 2012 fengmk2 <fengmk2@gmail.com>
* MIT Licensed
*/
"use strict";
/**
* Module dependencies.
*/
var __slice = Array.prototype.slice;
var Collection = require('mongodb').Collection;
var SkinCursor = require('./cursor').SkinCursor;
var helper = require('./helper');
var utils = require('./utils');
/**
* Constructor
*/
var SkinCollection = exports.SkinCollection = utils.makeSkinClass(Collection);
/**
* bind extend functions to collection
*
* e.g.
*
* db.bind('article').bind({
* getPostByAuthor: function(id, callback) {
* this.findOne({author_id: id}, callback);
* }
* });
*
*/
SkinCollection.prototype.bind = function(extendObject) {
for(var key in extendObject) {
Eif(typeof extendObject[key] == 'function') {
this[key] = extendObject[key].bind(this);
} else {
this[key] = extendObject[key];
}
}
}
SkinCollection.prototype._open = function(callback) {
var collection_args = this._collection_args.concat([callback]);
this._skin_db.open(function(err, db) {
Iif(err) return callback(err);
db.collection.apply(db, collection_args);
});
}
/*
* find is a special method, because it could return a SkinCursor instance
*/
SkinCollection.prototype._find = SkinCollection.prototype.find;
/**
* same args as find, but use Array as callback result but not use Cursor
*
* findItems(args, function (err, items) {});
*
* same as
*
* find(args).toArray(function (err, items) {});
*
* or using `mongodb.collection.find()`
*
* find(args, function (err, cursor) {
* cursor.toArray(function (err, items) {
* });
* });
*
* @param {Object} [query]
* @param {Object} [options]
* @param {Function(err, docs)} callback
* @return {SkinCollection} this
* @api public
*/
SkinCollection.prototype.findItems = function (query, options, callback) {
var args = __slice.call(arguments);
var fn = args[args.length - 1];
args[args.length - 1] = function (err, cursor) {
if (err) {
return fn(err);
}
cursor.toArray(fn);
};
this.find.apply(this, args);
return this;
};
/**
* find and cursor.each(fn).
*
* @param {Object} [query]
* @param {Object} [options]
* @param {Function(err, item)} eachCallback
* @return {SkinCollection} this
* @api public
*/
SkinCollection.prototype.findEach = function (query, options, eachCallback) {
var args = __slice.call(arguments);
var fn = args[args.length - 1];
args[args.length - 1] = function (err, cursor) {
if (err) {
return fn(err);
}
cursor.each(fn);
};
this.find.apply(this, args);
return this;
};
/**
* Operate by object.`_id`
*
* @param {String} methodName
* @param {String|ObjectID|Number} id
* @param {Arguments|Array} args
* @return {SkinCollection} this
* @api private
*/
SkinCollection.prototype._operateById = function (methodName, id, args) {
args = __slice.call(args);
args[0] = {_id: helper.toObjectID(id)};
this[methodName].apply(this, args);
return this;
};
/**
* Find one object by _id.
*
* @param {String|ObjectID|Number} id, doc primary key `_id`
* @param {Function(err, doc)} callback
* @return {SkinCollection} this
* @api public
*/
SkinCollection.prototype.findById = function (id, callback) {
return this._operateById('findOne', id, arguments);
};
/**
* Update doc by _id.
* @param {String|ObjectID|Number} id, doc primary key `_id`
* @param {Object} doc
* @param {Function(err)} callback
* @return {SkinCollection} this
* @api public
*/
SkinCollection.prototype.updateById = function (id, doc, callback) {
var oldCb = callback;
var _this = this;
if (callback) {
callback = function(error, res) {
oldCb.call(_this, error, res.result);
};
}
return this._operateById('update', id, [id, doc, callback]);
};
/**
* Remove doc by _id.
* @param {String|ObjectID|Number} id, doc primary key `_id`
* @param {Function(err)} callback
* @return {SkinCollection} this
* @api public
*/
SkinCollection.prototype.removeById = function (id, callback) {
var oldCb = callback;
var _this = this;
if (callback) {
callback = function(error, res) {
oldCb.call(_this, error, res.result.n);
};
}
return this._operateById('remove', id, [id, callback]);
};
/**
* Creates a cursor for a query that can be used to iterate over results from MongoDB.
*
* @param {Object} query
* @param {Object} options
* @param {Function(err, docs)} callback
* @return {SkinCursor|SkinCollection} if last argument is not a function, then returns a SkinCursor,
* otherise return this
* @api public
*/
SkinCollection.prototype.find = function (query, options, callback) {
var args = __slice.call(arguments);
if(this.isOpen()) {
return this._native.find.apply(this._native, args);
}
if (args.length > 0 && typeof args[args.length - 1] === 'function') {
this._find.apply(this, args);
return this;
} else {
var cursor = new SkinCursor();
cursor._skin_collection = this;
cursor._find_args = args;
return cursor;
}
};
|