First naive implementation of Articles controller.

articles_controller.rb

class Api::Private::ArticlesController < Api::Private::BaseController
  before_filter :find_or_create_article, except: [:index]

  def index
    @articles = Article.scoped

    if params[:state] == Article::PENDING
      @articles = Article.pending.order(:published_at)
    elsif params[:state] == Article::APPROVED
      @articles = Article.approved.order('approved_at DESC')
    elsif params[:query]
      @articles = articles_search(params[:query]).order('articles.created_at DESC')
    end

    respond_with @articles, each_serializer: article_serializer, root: 'articles'
  end
  
  private

  def articles_search(search_criteria)
    Article.includes(:categories).where('title LIKE ? OR categories.name LIKE ?', "%#{search_criteria}%", "%#{search_criteria}%")
  end

  #####
  # ...
  # The rest of the methods ommited
  # ...
  #####

end