resourcer

resourcer (alpha)

resource-oriented object-relational mapper for document databases.

introduction

engines

database

file

memory

Defining resources

Here's the simplest of resources:

var Creature = resourcer.define('creature');

The returned Creature object is a resource constructor, in other words, a function.

Now let's add some properties to this constructor:

Creature.property('diet'); // Defaults to String
Creature.property('vertebrate', Boolean);
Creature.property('belly', Array);

And add a method to the prototype:

Creature.prototype.feed = function (food) {
    this.belly.push(food);
};

Now lets instantiate a Creature, and feed it:

var wolf = new(Creature)({
    diet:      'carnivor',
    vertebrate: true
});
wolf.feed('squirrel');

You can also define resources this way:

var Creature = resourcer.define('creature', function () {
    this.property('diet');
    this.property('vertebrate', Boolean);
    this.property('belly', Array);

    this.prototype.feed = function (food) {
        this.belly.push(food);
    };
});

Defining properties with Resource.property

Resource.property(name, type='string', options={})

Lets define a legs property, which is the number of legs the creature has:

Creature.property('legs', Number);

Note that this form is equivalent:

Creature.property('legs', 'number');

If we wanted to constrain the possible values the property could take, we could pass in an object as the last parameter:

Creature.property('legs', Number, {
    required: true,

    minimum: 0,
    maximum: 8,

    assert: function (val) {
        return val % 2 === 0;
    }
});

Now resourcer won't let Creature instances be saved unless the legs property has a value between 0 and 8, and is even,

This style is also valid for defining properties:

Creature.property('legs', Number)
        .required()
        .minimum(0)
        .maximum(8)
        .assert(function (val) { return val % 2 === 0 });

If you want to access and modify an already defined property, you can do it this way:

Creature.properties['legs'].maximum(6);

Saving and fetching resources

Wolf.create({ name: 'Wolverine', age: 68 }, function (err, wolf) {
    if (err) { throw new(Error)(err) }

    console.log(wolf); // { _id: 42, resource: 'wolf', name: 'Wolverine', age: 68 }

    wolf.age ++;
    wolf.save(function (err) {
        if (! err) console.log('happy birthday ' + wolf.name + '!');
    });
});

Wolf.get(42, function (e, wolf) {
    if (e) { throw new(Error)(e) }

    wolf.update({ fur: 'curly' }, function (e, wolf) {
        console.log(wolf.fur); // "curly"
    });
});

Resource constructor methods

These methods are available on all user-defined resource constructors, as well as on the default resourcer.Resource constructor.

Resource.get(id, [callback])

Fetch a resource by id.

Resource.update(id, properties, [callback])

Update a resource with properties.

Resource.destroy(id, [callback])

Destroy a resource by id.

Resource.all([callback])

Fetches all resources of this type.

Resource.save(properties, [callback])

Resource.create(properties, [callback])

Resource prototype methods

These are the prototype methods, available on resource instances created with the new operator.

Resource.prototype.save([callback])

Resource.prototype.update(properties, [callback])

Resource.prototype.destroy([callback])

Resource.prototype.reload([callback])