How to access hidden_field in controller in Ruby on rails - ruby

Question

Question: How to access hidden field value post_id from file view/comments/_comment.html.erb and use it in controllers/dashboards_controller.rb?
- there are 2 controllers - dashboard and comments, and using gem act_as_commentable_with_threading
Now I get: ActiveRecord::RecordNotFound in DashboardsController#index Couldn't find Post without an ID
config/routes.rb
resources :comments, :only => [:create, :destroy]
controllers/dashboards_controller.rb
class DashboardsController < ApplicationController
def index
#post = Post.new
#user = current_user
#newest_users = User.newest_players
#feed_posts = Post.paginate(:page => params[:page], :per_page => 8)
#last_clubs = Club.last_clubs
#commented_post = Post.find(params[:post_id])
# trying to access params from view/comments/_comment.html.erb
# comments is another controller...
# do other operations with #commented_post
#comments = #commented_post.comment_threads.order('created_at desc')
#new_comment = Comment.build_from(#commented_post, current_user, '')
end
end
view/comments/_comment.html.erb
Add comment
place for a comment form
<div class="comment-form">
<%= form_for :comment, :remote => true do |f| %>
<%=f.hidden_field 'post_id', post.id %>
# need to use this value in dasboard controller
<%=f.text_field :body %>
<% end %>
</div>
view/dashboards/_feed_post.html.erb
<ul class="post-items">
<%if #feed_posts.any? %>
<% #feed_posts.each do |post| %>
<li>
<span class="image"><%= image_tag post.image.url(:message) if post.image?%></span>
<span class="content"><%= post.text_html %></span>
<span class="tags">Tags:<%= post.tag_list %></span>
<span class="meta">
Posted <%= time_ago_in_words(post.created_at) %> ago.
| <%= post.user.full_name %>
</span>
<%= render 'comments/form' ,:locals => { :comment => #new_comment, :post_id => post.id } %>
<%= render 'comments/comment', :collection => #comments, :as => :comment, :post_id => post.id %>
</li>
<% end %>
<% end %>
</ul>
view/dashboards/index
<div class="row">
<div class="span7">
<!--form for creating a new post-->
<section>
<%= render :template => 'posts/new' %>
</section>
<!--dashboard feed_post-->
<section>
<%= render :partial => 'dashboards/feed_post' %>
</section>
</div>

Answer 1

you are using f.hidden_field so you will get
<%=f.hidden_field 'post_id', post.id %>
will create following html ref hidden_field
<input type="hidden" id="comment_post_id" name="comment[post_id]" value="#{comment.post_id}" />
so you can access this as following in your controller
params[:comment][:post_id]
so use following instead
#commented_post = Post.find(params[:comment][:post_id])
if you want 'post_id' in params[:post_id] use hidden_field_tag like following
<%= hidden_field_tag 'post_id', post.id %>