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POHow can I only display an add review form if a user hasn't already submited a review?
 

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  1. POHow can I only display an add review form if a user hasn't already submited a review?
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    <p>Hi I'm a super beginner and working on my first app, I have a table of venues and users can add reviews to the venues. I would like to be able to hide the review form to users once they have submitted a review, to stop them from submitting more.</p> <p>This is what I have now:</p> <p><b>add review form on venue show page</b></p> <pre><code>&lt;% if reviewed? %&gt; &lt;%= form_for [@venue, @review], :class =&gt; 'rating_ballot' do |f| %&gt; &lt;%= f.label("value_1", content_tag(:span, '1'), {:class=&gt;"rating", :id=&gt;"1"}) %&gt; &lt;%= radio_button_tag("review[rating]", 1, :class =&gt; 'rating_button') %&gt; &lt;%= f.label("value_2", content_tag(:span, '2'), {:class=&gt;"rating", :id=&gt;"2"}) %&gt; &lt;%= radio_button_tag("review[rating]", 2, :class =&gt; 'rating_button') %&gt; &lt;%= f.label("value_3", content_tag(:span, '3'), {:class=&gt;"rating", :id=&gt;"3"}) %&gt; &lt;%= radio_button_tag("review[rating]", 3, :class =&gt; 'rating_button') %&gt; &lt;%= f.label("value_4", content_tag(:span, '4'), {:class=&gt;"rating", :id=&gt;"4"}) %&gt; &lt;%= radio_button_tag("review[rating]", 4, :class =&gt; 'rating_button') %&gt; &lt;%= f.label("value_5", content_tag(:span, '5'), {:class=&gt;"rating", :id=&gt;"5"}) %&gt; &lt;%= radio_button_tag("review[rating]", 5, :class =&gt; 'rating_button') %&gt; &lt;br&gt; &lt;p&gt;title: &lt;br&gt; &lt;%= f.text_field :title %&gt;&lt;/p&gt;&lt;br&gt; &lt;%= submit_tag %&gt; &lt;% end %&gt; &lt;% end %&gt; </code></pre> <p><b>application controller </b></p> <pre><code>class ApplicationController &lt; ActionController::Base helper :all # include all helpers, all the time protect_from_forgery # See ActionController::RequestForgeryProtection for details helper_method :reviewed? protected def reviewed? true end private def current_user @current_user ||= User.find(session[:user_id]) if session[:user_id] end end </code></pre> <p>I cant figure out what the reviewed? helper should be to allow me to do this, any help is greatly appreciated!</p> <p><b>edit</b></p> <p>I've added the has_reviewed helper to the application controller, it now shows this error:</p> <pre><code>Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id Extracted source (around line #79): 76: &lt;%= render :partial =&gt; 'reviews/review', :collection =&gt; @venue.reviews %&gt; 77: &lt;/div&gt; 78: 79: &lt;% if reviewed? %&gt; </code></pre> <p><b>application controller</b></p> <pre><code>class ApplicationController &lt; ActionController::Base helper :all # include all helpers, all the time protect_from_forgery # See ActionController::RequestForgeryProtection for details helper_method :current_user helper_method :has_reviewed helper_method :reviewed? protected def reviewed? Review.has_reviewed(@current_user.id, venue.id) end def has_reviewed !Review.where(:user_id=&gt;user,:venue_id=&gt;venue).blank? end private def current_user @current_user ||= User.find(session[:user_id]) if session[:user_id] end end </code></pre> <p><b>another edit</b></p> <p>I've changed the reviewed? helper method to:</p> <pre><code> def reviewed? if current_user Review.has_reviewed(@current_user.id, @venue.id) else nil end end </code></pre> <p>but it gives undefined method `has_reviewed' for # error</p> <p><b>schema</b></p> <p>A venue has many reviews</p> <p>A user has many reviews</p> <p>A review belongs to a user and a venue</p> <p>the routes looks like this:</p> <pre><code>App::Application.routes.draw do resources :sessions resources :users resources :venues do resources :reviews end end </code></pre>
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