/
collection_proxy.js
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/
collection_proxy.js
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var PROXY = {}
, _ = require('underscore');
function _apply(collection, fn, args) {
return collection[fn].apply(collection, args);
}
Object.defineProperty(PROXY, 'namespacer', {value: require('./namespacer'), writable: true});
Object.defineProperty(PROXY, 'mapper', {value: require('./mapper'), writable: true});
/**
* Proxies calls
*
* @param {Object} model
* @param {Object} options
* @param {Array} args
* @param {Function} callback
*/
PROXY.proxy = function (model, options, args, callback) {
var fn = options.method
, arguments_length = arguments.length;
model.getCollection(function (error, collection) {
// noop
if (arguments_length < 4) {
callback = function () {};
}
if (error) {
return callback(error, null);
}
if (options.namespacing && model.namespaces && model.namespaces[options.namespace]) {
// has side effects, alters args
PROXY.namespacer.filter(model.namespaces, options.namespace, fn, args);
}
if (options.mapping && model.maps) {
// has side effects, alters args
PROXY.mapper.map(model.maps, fn, args);
}
// overwritten method with hooks, or custom method
if (typeof PROXY[fn] !== 'undefined' && (typeof collection[fn] !== 'undefined' ? options.hooks : true)) {
return PROXY[fn](model, collection, args, callback);
// driver method or hooks disabled
} else {
args[args.length - 1] = callback;
_apply(collection, fn, args);
}
});
};
/**
* Calls `find` + `toArray`
*
* @param {Object} model
* @param {Object} collection
* @param {Array} args
* @param {Function} callback
*/
PROXY.findArray = function (model, collection, args, callback) {
args[args.length - 1] = function (error, cursor) {
cursor.toArray(callback);
};
_apply(collection, 'find', args);
};
/**
* Calls `insert`
* and triggers the `beforeInsert` and `afterInsert` hooks
*
* @param {Object} model
* @param {Object} collection
* @param {Array} args
* @param {Function} callback
*/
PROXY.insert = function (model, collection, args, callback) {
args[args.length - 1] = function (error, ret) {
if (error) return callback(error, null);
model.afterInsert(args[0], function (error, _) {
callback(error, ret);
});
};
if (!Array.isArray(args[0])) {
args[0] = [args[0]];
}
model.beforeInsert(args[0], function (error, documents) {
if (error) return callback(error, null);
args[0] = documents;
_apply(collection, 'insert', args);
});
};
/**
* Calls `findAndModify` or `update`
* and triggers the `beforeUpdate` and `afterUpdate` hooks
*
* @param {Object} model
* @param {Object} collection
* @param {Array} args
* @param {Function} callback
*/
['findAndModify', 'update'].forEach(function (method) {
PROXY[method] = function (model, collection, args, callback) {
var update_index = method === 'update' ? 1 : 2;
args[args.length - 1] = function (error, ret) {
if (error) {
return callback(error, null);
}
model.afterUpdate(args[0], args[update_index], function (error, _) {
callback(error, ret);
});
};
model.beforeUpdate(args[0], args[update_index], function (error, _query, _update) {
if (error) {
return callback(error, null);
}
args[0] = _query;
args[update_index] = _update;
_apply(collection, method, args);
});
};
});
/**
* Calls `remove`
* and triggers the `beforeRemove` and `afterRemove` hooks
*
* @param {Object} model
* @param {Object} collection
* @param {Array} args
* @param {Function} callback
*/
PROXY.remove = function (model, collection, args, callback) {
args[args.length - 1] = function (error, ret) {
if (error) {
return callback(error, null);
}
model.afterRemove(args[0], function (error, _) {
callback(error, ret);
});
};
model.beforeRemove(args[0], function (error, _query) {
if (error) {
return callback(error, null);
}
args[0] = _query;
_apply(collection, 'remove', args);
});
};
/**
* Calls `mapReduce` + `find`
*
* @param {Object} model
* @param {Object} collection
* @param {Array} args
* @param {Function} callback
*/
PROXY.mapReduceCursor = function (model, collection, args, callback) {
args[args.length - 1] = function (error, collection) {
if (error) {
callback(error, null);
} else {
collection.find(callback);
}
};
_apply(collection, 'mapReduce', args);
};
/**
* Calls `mapReduce` + `find` + `toArray`
*
* @param {Object} model
* @param {Object} collection
* @param {Array} args
* @param {Function} callback
*/
PROXY.mapReduceArray = function (model, collection, args, callback) {
PROXY.mapReduceCursor(model, collection, args, function (error, cursor) {
if (error) {
callback(error, null);
} else {
cursor.toArray(callback);
}
});
};
module.exports = PROXY;