title: Rails 5.1.2 Ajax remote: true not working
body: <p>I would like to implement ajax to create a post, without recharging the page and not going to the show (I following a tutorial) but is not working.</p>
  
  <p>in the _form.html.haml you can see remote:true in the form helper</p>
  
  <pre><code>= form_for @post,remote: true do |f| 
    - if @post.errors.any?
    #error_explanation
    %h2= "#{pluralize(@post.errors.count, "error")} prohibited this post 
    from being saved:"
      %ul
        - @post.errors.full_messages.each do |message|
          %li= message
  
    .mdl-textfield.mdl-js-textfield.full-width
      = f.text_area :body, class:"mdl-textfield__input"
      = f.label :body, "Comparte con la Comunidad", class:"mdl-
      textfield__label"
    .actions.text-right
      = f.submit 'Publicar', class:"mdl-button mdl-js-button mdl-button--
      raised mdl-button--colored"
  </code></pre>
  
  <p>however when the post is created, the application redirect to the show of the post created recently in html format, it should be stay in the form.</p>
  
  <p>I don't know if the version of Rails 5.1.2 has a issue, but in Rails 4 with only typing remote: true the application stay in the form after the submit action.</p>
  
  <p>post controller:</p>
  
  <pre><code>class PostsController &lt; ApplicationController
    before_action :set_post, only: [:show, :edit, :update, :destroy]
  
    # GET /posts
    # GET /posts.json
    def index
      @posts = Post.all
    end
  
    # GET /posts/1
    # GET /posts/1.json
    def show
    end
  
    # GET /posts/new
    def new
      @post = Post.new
    end
  
    # GET /posts/1/edit
    def edit
    end
  
    # POST /posts
    # POST /posts.json
    def create
      @post = current_user.posts.new(post_params)
  
      respond_to do |format|
        if @post.save
          format.html { redirect_to @post, notice: 'Post was successfully created.' }
          format.json { render :show, status: :created, location: @post }
        else
          format.html { render :new }
          format.json { render json: @post.errors, status: :unprocessable_entity }
        end
     end
  end
  
  # PATCH/PUT /posts/1
  # PATCH/PUT /posts/1.json
  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to @post, notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end
  
  # DELETE /posts/1
  # DELETE /posts/1.json
  def destroy
    @post.destroy
    respond_to do |format|
      format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' }
      format.json { head :no_content }
    end
  end
  
  private
  # Use callbacks to share common setup or constraints between actions.
  def set_post
    @post = Post.find(params[:id])
  end
  
  # Never trust parameters from the scary internet, only allow the white list through.
  def post_params
    params.require(:post).permit(:body)
  end
  end
  </code></pre>
  
  <p>also I have a show.js.erb file to render a view to see the body of the post after he is created.</p>
  
  <p>show.js.erb</p>
  
  <pre><code>$('#posts').append("&lt;%= render j @post %&gt;")
  </code></pre>
  
  <p>_post.haml</p>
  
  <pre><code>%article
    =post.body
  </code></pre>