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Forum_posts edit coming up as nil

Erick Sitter asked in General

ActionView::Template::Error (First argument in form cannot contain nil or be empty):
1: <%= form_for [@forum_thread, @forum_post] do |f| %>
2:

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3:

4: <%= f.text_area :body, placeholder: "Add a comment", rows: 10, class: "form-control"$
app/views/forum_posts/form.html.erb:1:in `_app_views_forum_postsform_html_erb_3822141534$
app/views/forum_threads/forum_posts/edit.html.erb:2:in `_app_views_forum_threads_forum_posts
$

Forum Posts Controller

class ForumThreads::ForumPostsController < ApplicationController
before_action :authenticate_user!
before_action :set_forum_thread
def create
@forum_post = @forum_thread.forum_posts.new forum_post_params
@forum_post.user = current_user

if @forum_post.save
  redirect_to forum_thread_path(@forum_thread, anchor: "forum_post_#{@forum_post.id}"), not$
else
  redirect_to @forum_thread, alert: "Unable to save your post"
end

end

def edit
end

def update
if @forum_post.update(forum_post_params)
redirect_to @forum_post
else
render 'edit'
end
end

private

def set_forum_thread
  @forum_thread = ForumThread.find(params[:forum_thread_id])
end

def forum_post_params
  params.require(:forum_post).permit(:body)
end

end

So ActionView::Template::Error (First argument in form cannot contain nil or be empty) means that when you call your form_for, one of the variables you passed in was nil. That means either forum_thread or forum_post in this was nil <%= form_for [@forum_thread, @forum_post] do |f| %>

It looks like you've got the before_action to set the forum_thread variable, but none on the edit action (or update) to set the forum_post. So most likely the forum_post is nil causing it to throw that error. Set that variable and you should be all set!

Thanks, got it!

But had to move it to edit.

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