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PORails 3: CSRF with form_tag
 

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  1. PORails 3: CSRF with form_tag
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    <p><strong>QUICK BACKGROUND</strong></p> <p>I have a model where a <code>facility</code> has_many <code>managers</code> through <code>relationships</code>. The relationship model holds one additional attribute, <code>admin</code>, which is a boolean. Then, for each facility, I have a page that allows an admin/some user to mark <code>managers</code>'s as <code>admin</code> or not. They do this through checkboxes. I am using devise for managers. Everything is pretty much done like the first 2 minutes of this railscast:</p> <p><a href="http://railscasts.com/episodes/165-edit-multiple-revised?view=comments" rel="nofollow">http://railscasts.com/episodes/165-edit-multiple-revised?view=comments</a></p> <p><strong>THE PROBLEM(S)</strong></p> <p>The issue is, when I submit the form_tag, I get:</p> <p><strong>1.</strong> WARNING: Can't verify CSRF token authenticity</p> <p><strong>2.</strong> It then resets my user session (logs me out of devise), so I have to log back in to continue working.</p> <p>If I remove <code>protect from forgery</code> from the application controller, everything works smoothly but obviously I don't want to do that as my fix.</p> <p>So, how can I avoid this CSFR issue with form_tag? </p> <p><strong>THE FORM</strong> (updated)</p> <pre><code>&lt;%= form_tag admin_relationships_path, method: :put do %&gt; &lt;table&gt; &lt;tr&gt; &lt;th&gt;&lt;/th&gt; &lt;th&gt;Person Name&lt;/th&gt; &lt;th&gt;Admin&lt;/th&gt; &lt;/tr&gt; &lt;% @relationships.each do |relationship| %&gt; &lt;tr&gt; &lt;td&gt;&lt;%= check_box_tag "relationship_ids[]", relationship.id %&gt;&lt;/td&gt; **&lt;%= hidden_field_tag :authenticity_token, form_authenticity_token %&gt;** &lt;td&gt;&lt;%= User.find(relationship.user_id).full_name %&gt;&lt;/td&gt; &lt;td&gt;&lt;%= relationship.admin ? "Yes" : "No" %&gt;&lt;/td&gt; &lt;td&gt;&lt;%= link_to 'Remove', relationship, method: :delete, **remote: true** %&gt;&lt;/td&gt; &lt;/tr&gt; &lt;% end %&gt; &lt;/table&gt; &lt;%= submit_tag "Make Checked Admins" %&gt; &lt;% end %&gt; </code></pre> <p>The contoller.</p> <pre><code>class RelationshipsController &lt; ApplicationController def destroy @relationship = Relationship.find(params[:id]) @relationship.destroy respond_to do |format| format.html { redirect_to "/facilities/1679/invite", notice: " Manager has been deleted." } format.json { head :no_content } end end </code></pre> <p>The log.</p> <pre><code>Started DELETE "/relationships/52" for 127.0.0.1 at 2013-11-26 14:30:11 -0500 Processing by RelationshipsController#destroy as JS Parameters: {"id"=&gt;"52"} WARNING: Can't verify CSRF token authenticity User Load (0.3ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 38 LIMIT 1 (0.1ms) BEGIN (0.1ms) COMMIT Relationship Load (0.2ms) SELECT `relationships`.* FROM `relationships` WHERE `relationships`.`id` = 52 LIMIT 1 (0.1ms) BEGIN SQL (0.2ms) DELETE FROM `relationships` WHERE `relationships`.`id` = 52 (0.4ms) COMMIT Redirected to http://localhost:3000/facilities/1679/invite Completed 302 Found in 10ms (ActiveRecord: 1.6ms) Started DELETE "/facilities/1679/invite" for 127.0.0.1 at 2013-11-26 14:30:11 -0500 ActionController::RoutingError (No route matches [DELETE] "/facilities/1679/invite"): </code></pre> <p>Request Headers:</p> <p><code>Accept</code>, <code>Accept-Encoding</code>, <code>Accept-Language</code>, <code>Connection</code>, <code>Cookie</code>, <code>Host</code>, <code>Origin</code>, <code>Referer</code>, <code>User-Agent</code>, <code>X-Requested-With</code></p> <p><strong>THE ANSWER</strong></p> <p>As the poster below mentioned, my CSFR token was not being received on the page. Although, I had the <code>&lt;%= csrf_meta_tag %&gt;</code> in my application layout and admin layout, and I was actually rendering the application layout, the form was on a Devise page.</p> <p>So I needed to place the <code>&lt;%= csrf_meta_tag %&gt;</code> code in <code>devise.html.erb.</code> You can find the troubleshooting below.</p>
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