Styjun

I'm trying to create an new ActiveRecord relationship taking current_user's id and assignment's id as foreign keys with a simple button press by the user. The user would be accepting the assignment and it would create that new association in a record. I already tested the models in the console and accept/decline work correctly as intended.

The error says when I click the button:
ActiveRecord::RecordNotFound in ContractsController#create

The form_for hidden_field doesn't pass assignment.id correctly, the parameter says:
"utf8"=>"✓", "authenticity_token"=>"dkGBIQxS06xiu9GR6+aYLgA6ZArgFD5iipl7HKDCFPdXhDKjX6dSajrLlrwvLlj4IzGutcX1lT51IhM5ksxt4Q==", "assignment_id"=>[""], "commit"=>"Accept"

As you can see, the assignment_id is blank. Not sure if I'm doing it right so, what's the correct way to do this?

I basically copied the code from Michael Hartl's tutorial on making Twitter, the concept is similar to an user following another user. I've already verified that the assignment record exists using find(#) in rails console myself.

_accept.html.erb

<%= form_for(current_user.active_contracts.build, local: true) do |f| %>
 <div><%= hidden_field_tag :assignment_id, @assignment.id %></div>
 <%= f.submit "Accept", class: "btn btn-primary" %>
<% end %>

ContractController.rb

 def create
 @assignment = Assignment.find(params[:assignment_id])
 current_user.accept(@assignment)
 redirect_to @assignment
 end

assignment#index

 <div class="col-md-9">
 <h2><%= assignment.event_title %></h2><br>
 <strong>Date: </strong><%= assignment.date_start.strftime("%D") %><br>
 <strong>Time: </strong><%= assignment.time_start.strftime("%I:%M %p") %> to <%= assignment.time_end.strftime("%I:%M %p") %><br>
 <strong>Address:</strong><br>
 <address><%= assignment.addressline1 %><br>
 <% if !assignment.addressline2.blank? %>
 <%= assignment.addressline2 %><br>
 <% end %>
 <%= assignment.city %>, <%= assignment.state %> <%= assignment.zip %>
 </address>
 </div>
 <% if assignment.user_id == current_user.id %>
 <div class="col-md-3">
 <%= link_to "Update", title_assignment_path(assignment), class: "btn btn-primary btn-block" %>
 </div>
 <% end %>
 <% if current_user.ssp? %>
 <div class="col-md-3">
 <%= render 'accept' %>
 </div>
 <% end %>
 </div>
 <% end %>
 </div>