Rails button_to doesn't hide parameters

Question

I just can't get things right inside button_to. What is wrong with the following code? I get the error message missing required keys: [:callsign]. Attempt 1:

<%= button_to messages_user_path,
              callsign: @character.callsign,
              params: {
                recipient_callsign: notice.character.callsign
              },
              class: 'btn btn-default btn-xs post_button',
              id: 'message_envelope' do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

This also fails with the same error message: Attempt 2:

<%= button_to messages_user_path(
                params: {
                  callsign: @character.callsign,
                  recipient_callsign: notice.character.callsign
                }
              ),
              class: 'btn btn-default btn-xs post_button',
              id: 'message_envelope' do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

This version shows the page, but it doesn't hide the recipient_callsign, which can be seen in the url. This defeats the object of using button_to in the first place because I don't want recipient_callsign in the url. Why doesn't it hide recipient_callsign? Attempt 3:

<%= button_to messages_user_path(
                callsign: @character.callsign,
                params: {
                  recipient_callsign: notice.character.callsign
                }
              ),
              class: 'btn btn-default btn-xs post_button',
              id: 'message_envelope' do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

max · Accepted Answer · 2015-10-12 18:42:38Z

1

<%= button_to 'Button text', messages_user_path(callsign: @character.callsign),
   class: 'btn btn-default btn-xs post_button',
   id: 'message_envelope',
   params: {
     recipient_callsign: notice.character.callsign
   }
  do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

First lets separate the path helper method:

messages_user_path(callsign: @character.callsign)

Path and url helpers take a hash. Any keys provided except the named keys will be added to the query string.

Take this example:

micropost_path(id: 6)    
=> "/microposts/6"
micropost_path(id: 6, foo: 'bar')
=> "/microposts/6?foo=bar"

The signature for button_to is basically:

<%= button_to 'text', action, options = {} %>

You add inputs to the form with the params option.

{
  class: 'btn btn-default btn-xs post_button',
  id: 'message_envelope',
  params: {
     recipient_callsign: notice.character.callsign
   }
}

http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-button_to

edited Oct 12, 2015 at 18:42

answered Oct 12, 2015 at 18:31

max

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2 Comments

Bazley Over a year ago

Excellent, thank you. Although it only worked once I removed 'Button text' ( stackoverflow.com/questions/14986559/… )

max Over a year ago

Oh, yeah, you where using a block :)

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