CODEWITHSUNDEEP
ruby-on-railsrubycontrollerparameter-passing
jamesdlivesinatree
jamesdlivesinatree

Reputation: 730

Passing ID to Controller from Object in Rails

I'm trying to simply pass an object (dgroup) to another controller's (tplans) index action. I'm performing a lookup based on a foreign key, so I am passing it an object id that it must filter on, but it doesn't seem to be working. This is my code:

Within the dgroup's index.html:

<% @dgroups.each do |dgroup| %>
<tr>
<td><%= dgroup.id %></td>
<td><%= link_to 'Show TPlans', tplans_path(dgroup) %></td>
<td><%= link_to 'Edit', edit_dgroup_path(dgroup) %></td>
<td><%= link_to 'Destroy', dgroup, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>

Within tplan's controller:

def index
  @dgid = Dgroup.find(params[:id])
  @tplans = @dgid.tplans

  respond_to do |format|
    format.html # index.html.erb
    format.json { render json: @tplans }
end
end

What am I doing wrong? Note that If I replace:

@dgid = Dgroup.find(params[:id])

with 

@dgid = Dgroup.find(1)

the code works, just obviously does not find the object that I want. I was just doing this to make sure the controller code was structured correctly.

Upvotes: 1

Views: 1596

Answers (2)

Deepika
Deepika

Reputation: 826

You are passing an object dgroup to your links instead of passing an id.

Try

<% @dgroups.each do |dgroup| %>
<tr>
<td><%= dgroup = dgroup.id %></td>
<td><%= link_to 'Show TPlans', tplans_path(dgroup) %></td>
<td><%= link_to 'Edit', edit_dgroup_path(dgroup) %></td>
<td><%= link_to 'Destroy', dgroup, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>

or 

<% @dgroups.each do |dgroup| %>
<tr>
<td><%= dgroup.id %></td>
<td><%= link_to 'Show TPlans', tplans_path(dgroup.id) %></td>
<td><%= link_to 'Edit', edit_dgroup_path(dgroup.id) %></td>
<td><%= link_to 'Destroy', dgroup.id, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>

Upvotes: 0

user2323194
user2323194

Reputation: 81

I suspect your params[:id] is coming nil.

try 

 <td><%= link_to 'Show TPlans', tplans_path(:id => dgroup.id) %></td>

you will get it in your index method.

the reason is if you rake:routes you will see 

 tplans GET    /tplans(.:format)          {:action=>"index", :controller=>"tplas"}

Upvotes: 2

Related Questions