placid

Placid is an ActiveRecord-ish model using a REST API for storage. The REST API can be any backend you choose or create yourself, provided it follows some basic conventions.

Documentation is on rdoc.info.

$ gem install placid

Define a subclass with the name of your REST model:

class Person < Placid::Model
end

and you'll get these class methods, and their REST equivalents, automatically:

Person.list              # GET     /people
Person.create(attrs)     # POST    /person      (attrs)
Person.find(id)          # GET     /person/:id
Person.destroy(id)       # DELETE  /person/:id
Person.update(id, attrs) # PUT     /person/:id  (attrs)

By default, placid assumes that your REST API is running on localhost. To change this, set:

Placid::Config.rest_url = 'http://my.rest.host:8080'

Each model has a field that is used for uniquely identifying instances. This would be called the "primary key" in a relational database. If you don't specify the name of the field, id is assumed. If your model uses a different field name, you can specify it like this:

class Person < Placid::Model
  unique_id :email
end

The Placid::Model base class includes helper methods for basic HTTP requests, the most important of which is request. You can use these from any model instance, or call them from custom methods you define on your model. For example:

class Person < Placid::Model
  unique_id :email

  def add_phone(phone_number)
    request(:put, model, id, 'add_phone', phone_number)
  end
end

jenny = Person.new(:email => 'jenny@example.com')

Now, calling this:

jenny.add_phone('867-5309')

Is the same as:

jenny.request(:put, 'person', 'jenny@example.com', 'add_phone', '867-5309')

By default, Placid assumes that your REST pathnames use the snake_case version of your model's name. That is, if you have these models:

class Person < Placid::Model
end

class HomeAddress < Placid::Model
end

then Placid will use these REST paths:

/person
/home_address

To override this behavior for a single model, simply define the model class method. For instance, if the REST path for HomeAddress should be addr, do:

class HomeAddress < Placid::Model
  def self.model
    'addr'
  end
end

If you want to override this behavior for all models in your app, create a shared base class derived from Placid::Model, and override the model class method there. For example, if your REST paths use the exact CamelCase model name, you could do:

class Model < Placid::Model
  def self.model
    self.name
  end
end

class Person < Model
end

class HomeAddress < Model
end

This configuration will use REST paths like:

/Person
/HomeAddress

The MIT License

Copyright (c) 2012 Eric Pierce, Automation Excellence, Society for Human Resource Management

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.