Mongoshawk is a MongoDB object modeling for NodeJS.
- Paul Duthoit (Creator)
First install NodeJS and MongoDB. Then:
$ npm install mongoshawkThe current stable branch is master. More updates will be added for the 0.3.x release series.
First, we need to define a connection. Your app can use one or more databases. Use Mongoshawk.createConnection. createConnection take the parameters connectionName, databaseName, databaseServerConfig, databaseOption, callback.
var Mongoshawk = require('mongoshawk');
var connectionName = "main";
var databaseName = "my_database";
var databaseServerConfig = {
host: "127.0.0.1",
port: "27017"
};
var databaseOption = {};
// Create connection
Mongoshawk.createConnection(connectionName, databaseName, databaseServerConfig, databaseOption, function(err, connection) {
// If error
if(err) {
throw err;
}
console.log('Connection to database is established' + '\r');
});Once connected, the callback function is trigged with the parameters err, connection. The connection is a mongodb object. If the callback function is not defined, you can retrieve the connection object by using Mongoshawk.getConnection('connectionName').
Models are defined through the Mongoshawk interface with the Schema interface.
var Mongoshawk = require('mongoshawk');
var Schema = Mongoshawk.Schema;
var modelName = "User";
var databaseConnection = Mongoshawk.getConnection("main");
var collectionName = "user";
var schema = new Schema({
name : String,
email : String,
date : Date
});
// Add model
Mongoshawk.addModel(modelName, databaseConnection, collectionName, schema);You can catch more informations about how to structure your model schema on the Mongoshawk Documentation (available soon).
The following example shows some of these features:
var Mongoshawk = require('mongoshawk');
var Schema = Mongoshawk.Schema;
var ValidationRule = Mongoshawk.ValidationRule;
// Set schema
var schema = new Schema({
name : { type: String, required: "create" },
email : { type: String, validation: new ValidationRule("email") },
contacts : [ { type: Schema.Types.ObjectId } ],
date : { type: Date, default: Date.now, required: true }
}, { allowUndefinedFields: false });Once we define a model through Mongoshawk.addModel, we can access it through functions Mongoshawk.getModels and Mongoshawk.getModel.
var Mongoshawk = require('mongoshawk');
var allMyModel = Mongoshawk.getModels();
var oneOfMyModel = Mongoshawk.getModel('MyModelName');Or just do it all at once
var MyModel = Mongoshawk.addModel('ModelName', myDatabaseConnection, 'myCollectionName', mySchema);We can then instantiate it, and list documents from the collection:
var Mongoshawk = require('mongoshawk');
var MyModel = Mongoshawk.getModel('MyModelName');
var myModelInstance = new MyModel();
// List documents
myModelInstance.list({}, { field_i_want: 1 }, function(err, datas) {
// ...
});You can also show, create, update, remove, etc. For more details, check out the Mongoshawk Documentation (available soon).
One of the most powerful features of Mongoshawk is the ability to link relational mapping provided by the Model. The two relational mapping types are references and relationships.
The references allow you to retrieve edge objects defined in a Schema.Types.ObjectId field of a Model.
First, we need to define the reference. Use Model.addReference. Model.addReference take the parameters fieldPath, reference.
var Mongoshawk = require('mongoshawk');
var MyModel = Mongoshawk.getModel('MyModelName');
var AnotherModel = Mongoshawk.getModel('AnotherModelName');
// Add reference
myModel.addReference('field_path', AnotherModel);The reference parameter of the Model.addReference can also be a function.
var Mongoshawk = require('mongoshawk');
var MyModel = Mongoshawk.getModel('MyModelName');
var AnotherModel = Mongoshawk.getModel('AnotherModelName');
// Set reference function
var refFunction = function(filter, fields, options, callback) {
var anotherModelInstance = new AnotherModel();
filter = { '$and': [ { a_field: 'a value' }, filter ] };
anOtherModelInstance.list(filter, fields, options, callback);
};
// Add reference
myModel.addReference('field_path', refFunction);You can also define reference of multiple Models or functions. For more details, check out the Mongoshawk Documentation (available soon).
Once the reference defined, we can retrieve documents with its edge documents:
var Mongoshawk = require('mongoshawk');
var MyModel = Mongoshawk.getModel('MyModelName');
var myModelInstance = new MyModel();
// Show a document without populate edges
myModelInstance.show(anId, { field_i_want: 1, edge_i_want: 1 }, function(err, datas) {
/* datas = {
_id: '1a',
field_i_want: 'a value',
edge_i_want: '2b'
} */
});
// Show a document with populated edges
myModelInstance.show(anId, { field_i_want: 1, edge_i_want: { '$fields': { field_i_want: 1 } } }, function(err, datas) {
/* datas = {
_id: '1a',
field_i_want: 'a value',
edge_i_want: {
_id: '2b',
field_i_want: 'another value'
}
} */
});The relationships allow you to retrieve edge objects referenced in another Model.
First, we need to define the relationship. Use Model.addRelationship. Model.addRelationship take the parameters fieldPath, relationship.
var Mongoshawk = require('mongoshawk');
var MyModel = Mongoshawk.getModel('MyModelName');
var AnotherModel = Mongoshawk.getModel('AnotherModelName');
// Add relationship
myModel.addRelationship('field_path', { ref: AnotherModel, refPath: 'relationship_field_path' });The relationship.ref parameter of the Model.addRelationship can also be a function.
var Mongoshawk = require('mongoshawk');
var MyModel = Mongoshawk.getModel('MyModelName');
var AnotherModel = Mongoshawk.getModel('AnotherModelName');
// Set relationship function
var relFunction = function(filter, fields, options, callback) {
var anotherModelInstance = new AnotherModel();
filter = { '$and': [ { a_field: 'a value' }, filter ] }
anOtherModelInstance.list(filter, fields, options, callback);
};
// Add relationship
myModel.addRelationship('field_path', { ref: relFunction, refPath: 'relationship_field_path' });You can also define relationship by providing a condition in place of a refPath. For more details, check out the Mongoshawk Documentation (available soon).
Once the relationship defined, we can retrieve documents with its edge documents:
var Mongoshawk = require('mongoshawk');
var MyModel = Mongoshawk.getModel('MyModelName');
var myModelInstance = new MyModel();
// Show a document with populated edges
myModelInstance.show(anId, { field_i_want: 1, edges_i_want: { '$fields': { field_i_want: 1 } } }, function(err, datas) {
/* datas = {
_id: '1a',
field_i_want: 'a value',
edges_i_want: [ {
_id: '2b',
field_i_want: 'another value'
} ]
} */
});The driver being used defaults to node-mongodb-native.
Find the API docs here (available soon).
Copyright (c) 2015 Paul Duthoit <duthoit.paul@gmail.com>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.