RowsController
==============
[![Gem Version](https://badge.fury.io/rb/rows_controller.svg)](https://badge.fury.io/rb/rows_controller)
[![Build Status](https://travis-ci.org/matique/rows_controller.png?branch=master)](https://travis-ci.org/matique/rows_controller)

DRYs Rails controllers. Imagine replacing that @order by 'resource' in the
controllers/views and, imho, an area for DRYing appears.
Instead of:

    class OrdersController < ApplicationController
     .....
     private
      def order_params
       params.require(:order).permit(:name)
      end
    end

use:

    class OrdersController < RowsController  # < ApplicationController
     private
      def resource_whitelist
       %i{ name }
      end
    end

I.e. RowsController defines all the usual methods (index, show, edit,...).

The methods may be redefined in OrdersController overwriting the
methods from RowsController.

Low level methods like 'resources' may be redefined as well.
An example:

    def resources
      @_resources ||= model_class.paginate(page: params[:page])
    end

RowsController inherites from ApplicationController, i.e. all the helpers
defined there will be available.


Customizing of views
--------------------

RowsController initializes some instance variables used in the views
(e.g. @order, @orders; legacy @row & @rows are still supported).
Furthermore, the helpers resource, resources, set_resource and
set_resources are available. You guess their usage.

Providing e.g. an "#{Rails.root}/app/views/order/index.html.erb"
overwrites the default RowsController view as Rails will first look
into the directory "#{Rails.root}/app/views" before looking
into the RowsController.

Similarly, partials '\_row\_buttons' and '\_list\_footer' may be overwritten
as well.


model_class
-----------

RowsController guesses the model from params[:controller]. This can
be changed by e.g.:

    class OrdersController < RowsController
      model_class Booking
      ...

The model class can be retrieved with the helper model_class.


Rails 5
-------

This gem is intended for Rails 5.
Older Rails versions may use "gem 'rows_controller', '= 2.0.8'".

Rails 4
-------

This gem is intended for Rails 4.
Older Rails versions may use "gem 'rows_controller', '= 1.1.9'".

Rails 4 introduced strong parameters.
To support them a private method 'resource_whitelist' is required
in the controllers.
Alternatively you may define the private method 'resource_params'
in the controller to filter params.


## Enhancements

### copy

The method "copy" was added to the RowsExtController.
"copy" is like "new", however its attributes are initialized
from an existing resource.
The "id" of the cloned resource is set to nil.

Usage of "copy" requires a defining in config/routes.rb. An example:

    resources :orders
      get 'copy', on: :member
    end

### columns

Add a class method 'column_headers' to the model
returning the columns to be displayed by '#index'.
Default is to display the columns returned by 'content_columns',
a class method which returns the columns defined by the ActiveRecord model.


## Installation and Testing

As usual:

    gem 'rows_controller' # in Gemfile
    bundle
    ( cd spec/dummy; rake db:create db:migrate )
    rake


## Credits

Inspiration from the web.
Look for:

- Radiant
- inherited_resources
- decent_exposure

Copyright (c) 2009-2017 [Dittmar Krall], released under the MIT license.