promised-jugglingdb-model-loader

An extended JugglingDB Schema class to help with loading model definitions from separate files.

Usage

Example directory structure

index.js
model-definition /
    user.js
    user /
        profile.js
derpy-models /
    herp.js
    herp /
        derp.js
    foo /
        bar /
            baz.js

JavaScript

index.js

var SchemaWithLoader = require('promised-jugglingdb-model-loader');
 
var schema = new SchemaWithLoader('redis',{
    port        : 6379,
    //settings to pass to loader
    modelLoader : {
        // [optional]
        // [default] = require.main.filename
        // Will set the base directory that
        // relative "directory" properties are resolved
        // from.
        rootDirectory : '.',
 
        // [optional]
        // [default] = 'model-definition'
        // Will set the directory (or directories)
        // that should be searched for model
        // definitions.
        directory     : 'model-definition'
 
        // For multiple directories...
        directory     : [
            'model-definition',
            'derpy-modules'
        ]
    }
});
 
 
// Resolves to user.js
// is found in model-definition, meaning final path
// relative to rootDirectory is
// "model-definition/user.js"
var User = schema.loadDefinition('User');
 
// Resolves to user/profile.js
// is found in model-definition, meaning final path
// relative to rootDirectory is
// "model-definition/user/profile.js"
var UserProfile = schema.loadDefinition('UserProfile');
 
// Resolves to herp/derp.js
// is found in derpy-models, meaning final path
// relative to rootDirectory is
// "derpy-models/herp/derp.js"
var Herp = schema.loadDefinition('Herp');
 
// Resolves to herp/derp.js
// is found in derpy-models, meaning final path
// relative to rootDirectory is
// "derpy-models/herp/derp.js"
var HerpDerp = schema.loadDefinition('HerpDerp');
 
// Resolves to foo/bar/baz.js
// is found in derpy-models, meaning final path
// relative to rootDirectory is
// "derpy-models/foo/bar/baz.js"
var FooBarBaz = schema.loadDefinition('FooBarBaz');

Names should be camel-cased, as that defines the directory structure that the loader will be searching through.

Definition File

Format

The module.exports property needs to be a function that accepts one argument. This argument will be a reference to the SchemaWithLoader instance that called loadDefinition().

Example Definition Files

user.js

module.exports = function (schema) {
    var User = schema.define('User',{
        name  : String,
        email : String
    });
 
    return User;
};

user/profile.js

In this file, a UserProfile belongs to just one user, which means that a call to UserProfile.belongsTo is required. Since schema is an instance of SchemaWithLoader, you can call loadDefinition('User') to load the User definition if it hasn't been and return it. If User has already been loaded previously, it will be returned without executing another definition loading operation.

var Schema = require('promised-jugglingdb').Schema;
 
module.exports = function (schema) {
    var UserProfile = schema.define('UserProfile',{
        bio : Schema.Text
    });
    UserProfile.belongsTo(schema.loadDefinition('User'),{
        as         : 'profile',
        foreignKey : 'userId'
    });
    return UserProfile;
};

TODO formal documentation of method calls.