undefined method `model_name' with simple_form on Rails 5

Question

I'm getting an undefined method 'model_name' error with simple_form when I want to edit a basic post on Rails 5.

show.html.haml:

= link_to "Edit", edit_post_path(@post)

edit.html.haml:

= simple_form_for @post do |f|
    = f.input :title
    = f.input :link
    = f.input :description

    = f.button :submit

posts_controller.rb:

def show
  @post = Post.find(params[:id])
end

def edit
end

def update
  if @post.update(post_params)
    redirect_to @post
  else
    render 'edit'
  end
end

Any idea?

This would have been far more obvious, had you posted the full error message -- Which, presumably, said "...for nil:NilClass", implying that your @post variable was nil. — Tom Lord
– Tom Lord, Commented Nov 17, 2016 at 15:28

Andrey Deineko · Accepted Answer · 2016-11-17 14:24:14Z

0

def edit
  @post = Post.find(params[:id]) # <=========
end

answered Nov 17, 2016 at 14:24

Andrey Deineko

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