/app/controllers/blogs_controller.rb

class BlogsController < ApplicationController
  before_action :authenticate_user!, only: [:edit, :new, :update, :destroy]
  before_action :set_blog, only: [:show, :edit, :update, :destroy]

  # GET /blogs
  # GET /blogs.json
  def index
    if params[:q].present?
      @q = Blog.ransack(params[:q])
      @blogs = @q.result(distinct: true).order('created_at DESC')
    elsif params[:tag].present?
      @blogs = Blog.tagged_with(params[:tag]).order('created_at DESC')
    else
      @blogs = Blog.all.order('created_at DESC')
    end
  end

  # GET /blogs/1
  # GET /blogs/1.json
  def show
  end

  # GET /blogs/new
  def new
    @blog = Blog.new
  end

  # GET /blogs/1/edit
  def edit
    authorize @blog
  end

  # POST /blogs
  # POST /blogs.json
  def create
    @blog = Blog.new(blog_params)
    @blog.user = current_user

    respond_to do |format|
      if @blog.save
        format.html { redirect_to @blog, notice: 'Blog was successfully created.' }
        format.json { render :show, status: :created, location: @blog }
      else
        format.html { render :new }
        format.json { render json: @blog.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /blogs/1
  # PATCH/PUT /blogs/1.json
  def update
    authorize @blog
    respond_to do |format|
      if @blog.update(blog_params)
        format.html { redirect_to @blog, notice: 'Blog was successfully updated.' }
        format.json { render :show, status: :ok, location: @blog }
      else
        format.html { render :edit }
        format.json { render json: @blog.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /blogs/1
  # DELETE /blogs/1.json
  def destroy
    authorize @blog
    @blog.destroy
    respond_to do |format|
      format.html { redirect_to blogs_url, notice: 'Blog was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_blog
      @blog = Blog.friendly.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def blog_params
      params.require(:blog).permit(:title, :content, :publish, :tag_list, :image_url)
    end
end