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POFirst argument in form cannot contain nil or be empty (acts_as_commentable error)
 

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  1. POFirst argument in form cannot contain nil or be empty (acts_as_commentable error)
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    <p>So I'm trying to get the acts_as_commentable_with_threading gem working in my app. I would like to allow the users to comment on specific events (events/show.html). I don't think I've set it up properly as I'm getting the below error.</p> <p><strong>error:</strong></p> <p>Showing /Users/user/Sites/new_work/app/views/events/show.html.erb where line #36 raised:</p> <pre><code>First argument in form cannot contain nil or be empty &lt;/div&gt; &lt;div class="name"&gt;&lt;/div&gt; &lt;div id="comments"&gt; &lt;%= form_for @comment do |f| %&gt; &lt;---- it's referring to this line &lt;div&gt;&lt;%= f.hidden_field :event_id, value: @event.id %&gt;&lt;/div&gt; &lt;div&gt;&lt;%= f.text_field :body, row: 20, placeholder: "Leave a comment" %&gt;&lt;/div&gt; &lt;%= f.submit "Post Comment" %&gt; </code></pre> <p><strong>comments_controller.rb</strong></p> <pre><code>class CommentsController &lt; ApplicationController before_filter :load_commentable def index @comments = @commentable.current_user.comments end def new @comment = @commentable.current_user.comments.new end def create @comment = @commentable.current_user.comments.new(params[:comment]) if @comment.save redirect_to @commentable, notice: "Comment created." else render :new end end private def load_commentable resource, id = request.path.split('/')[1, 2] @commentable = resource.singularize.classify.constantize.find(id) end end </code></pre> <p><strong>comment.rb snippit only</strong></p> <pre><code>class Comment &lt; ActiveRecord::Base attr_accessible :title, :body, :subject acts_as_nested_set :scope =&gt; [:commentable_id, :commentable_type] validates :body, :presence =&gt; true validates :user, :presence =&gt; true # NOTE: install the acts_as_votable plugin if you # want user to vote on the quality of comments. #acts_as_votable belongs_to :commentable, :polymorphic =&gt; true # NOTE: Comments belong to a user belongs_to :user </code></pre> <p><strong>event.rb</strong></p> <pre><code>class Event &lt; ActiveRecord::Base attr_accessible :title, :description, :location, :date, :time, :event_date acts_as_commentable has_many :comments, as: :commentable belongs_to :user after_create :update_event_date def update_event_date date = self.date.to_s time = self.time hour = Time.parse(time).strftime("%H:%M:%S").to_s event_date = (date + ' ' + hour).to_time self.update_attributes(event_date: event_date) end end </code></pre> <p><strong>comments/form.html.erb</strong></p> <pre><code>&lt;%= form_for [@commentable, @comment] do |f| %&gt; &lt;% if @comment.errors.any? %&gt; &lt;div class="error_messages"&gt; &lt;h3&gt;Please correct the following errors.&lt;/h3&gt; &lt;ul&gt; &lt;% @comment.errors.full_messages.each do |msg| %&gt; &lt;li&gt;&lt;%= msg %&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;% end %&gt; &lt;div class="field"&gt; &lt;%= f.text_field :body, rows: 10, placeholder: "Leave a comment" %&gt; &lt;/div&gt; &lt;div class="actions"&gt; &lt;%= f.submit "Post comment", class: "btn" %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p><strong>events_controller.rb</strong></p> <pre><code>class EventsController &lt; ApplicationController before_filter :authenticate_user! def index @user = current_user @events = Event.all end def new @event = Event.new end # def create # @event = Event.new(params[:event]) # if @event.save # redirect_to :action =&gt; 'index' # else # @events = Event.find(:all) # render :action =&gt; 'new' # end # end def create @event = current_user.events.new(event_params) respond_to do |format| if @event.save format.html { redirect_to :back, notice: 'Event was successfully created.' } format.json { render action: 'show', status: :created, location: @event } format.js else format.html { render action: 'new' } format.json { render json: @event.errors, status: :unprocessable_entity } format.js end end end def show @event = Event.find(params[:id]) end def edit @event = Event.find(params[:id]) end def update @event = Event.find(params[:id]) if @event.update_attributes(params[:event]) flash[:success] = "Event updated." redirect_to @event else render 'edit' end end def destroy @event = Event.find(params[:id]) @event.destroy respond_to do |format| format.html {redirect_to :back} format.js end end private # Use callbacks to share common setup or constraints between actions. def set_event @event = Event.find(params[:id]) end </code></pre> <p><strong>routes.rb</strong></p> <pre><code>New_app::Application.routes.draw do # get 'auth/:provider/callback', to: 'sessions#create' # get 'auth/failure', to: redirect('/') root to: "home#landing" devise_for :users, :controllers =&gt; {:registrations =&gt; "users/registrations", :sessions =&gt; "users/sessions", :passwords =&gt; "users/passwords", :omniauth_callbacks =&gt; "users/omniauth_callbacks" } get "welcome", to: "home#welcome", as: 'welcome' devise_scope :user do # get "edit/edit_account", :to =&gt; "devise/registrations#edit_account", :as =&gt; "account_registration" get 'edit/edit_account' =&gt; 'users/registrations#account_registration', as: :edit_account end # patch '/users/:id', to: 'users#update', as: 'user' get 'profile/:id' =&gt; "users#show", as: :profile get 'disconnect' =&gt; 'users#disconnect' resources :users do resources :questions end resources :photos resources :events do resources :comments end post "/events/add_new_comment" =&gt; "events#add_new_comment", :as =&gt; "add_new_comment_to_events", :via =&gt; [:event] resources :questions end </code></pre> <p><strong>rake routes for comments</strong></p> <pre><code>event_comments GET /events/:event_id/comments(.:format) comments#index POST /events/:event_id/comments(.:format) comments#create new_event_comment GET /events/:event_id/comments/new(.:format) comments#new edit_event_comment GET /events/:event_id/comments/:id/edit(.:format) comments#edit event_comment GET /events/:event_id/comments/:id(.:format) comments#show PATCH /events/:event_id/comments/:id(.:format) comments#update PUT /events/:event_id/comments/:id(.:format) comments#update DELETE /events/:event_id/comments/:id(.:format) comments#destroy </code></pre>
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