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Forum_posts edit coming up as nil
ActionView::Template::Error (First argument in form cannot contain nil or be empty):
1: <%= form_for [@forum_thread, @forum_post] do |f| %>
2:
Reply to thread
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!