Question

I’m making a conventional forum in Rails to practice. I have a Topic model and a nested Post model. Topics can have many Posts.

Topics#Show has a list of @topic.posts and then a new Post form.

# Topics#Show
def show
  @topic = Topic.find(params[:id])
  @post = @topic.posts.new
end

Submitting a new post sends it to Posts#Create

# Posts#Create
  def create
    @topic = Topic.find(params[:topic_id])
    @post = @topic.posts.new(params[:post])
    @post.user = current_user
    if @post.save
      redirect_to @topic, :notice => "Successfully created post."
    else
      render :action => 'new' # <-- Unsure what to do here
    end
  end

If the Post fails to save, I want it to render Topics#Show and display the validation errors there.

From what I understand, params don’t persist through a redirect_to because a 302 redirect starts a new request.

Answer 1

You should render the topics/show view. So instead of

render :action => 'new' # <-- Unsure what to do here

Do:

render :template => 'topics/show'