passing parameters through link_to method in ruby on rails 4 -

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i have index view shows available classes want link "sign class" redirects me "sign up" form , fill other values , when sign created saves values filled plus foreign key of class passed via link method

classes index:

<h1>listof classes</h1>  <table>   <thead>     <tr>       <th>id</th>       <th>name</th>       <th>description</th>       <th>actions</th>     </tr>   </thead>   <tbody>     <% @classes.each |class| %>       <tr>         <td><%= class.id %></td>         <td><%= class.name %></td>         <td><%= class.description %></td>         <td><%= link_to 'sign up!', new_sign_up_path(:class_id => class.id), method: :post %></td>        </tr>     <% end %>   </tbody> </table>

sign_up controller:

class signupscontroller < applicationcontroller   before_action :set_sign_ups, only: [:show, :edit, :update, :destroy]    # /sign_ups/new   def new     @sign_up = signup.new   end      def set_sign_ups       @sign_up = signup.find(params[:id])     end      def sign_up_params       params.require(:sign_up).permit(:date, :status, :type, :class_id)     end end

and sign ups form:

<%= form_for(@sign_up) |f| %>    <div class="field">     <%= f.label :date %><br>     <%= f.date_select :date %>   </div>   <div class="field">     <%= f.label :status %><br>     <%= f.check_box :status %>   </div>   <div class="field">     <%= f.label :type %><br>     <%= f.number_field :type %>   </div>     <div class="field">     <%= f.hidden_field :class_id %>   </div>   <div class="actions">     <%= f.submit %>   </div> <% end %>

when save it doesn't save the class_id... i've tried parsing integer i've tried without hidden field allways passes blank en saving... ideas?

you passing in params[:class_id] parameter on link_to. form object class_id attribute expecting @sign_up object have class_id attribute.

basically new action you'll need set @sign_up class_id parameters:

def new   @sign_up = signup.new   @sign_up.class_id = params[:class_id] if params.has_key?(:class_id) end

this set class_id parameter passed in link_to url.

then form should work okay because f.hidden_field @ current value of class_id on @sign_up , set value of input. doesn't matter haven't saved @ point - form_for use unsaved state populate inputs.


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