Rails select helper - Default selected value, how?

Question

Here is a piece of code I\'m using now:

<%= f.select :project_id, @project_select %>

How to modify it to make its default value equal

Answer 1

<%= f.select :project_id, @project_select, :selected => params[:pid] %>

Answer 2

Mike Bethany's answer above worked to set a default value when a new record was being created and still have the value the user selected show in the edit form. However, I added a model validation and it would not let me submit the form. Here's what worked for me to have a model validation on the field and to show a default value as well as the value the user selected when in edit mode.

  <div class="field">
    <%= f.label :project_id, 'my project id', class: "control-label" %><br>
    <% if @work.new_record? %>
      <%= f.select :project_id, options_for_select([['Yes', true], ['No', false]], true), {}, required: true, class: "form-control" %><br>
    <% else %>
      <%= f.select :project_id, options_for_select([['Yes', true], ['No', false]], @work.project_id), {}, required: true, class: "form-control" %><br>
    <% end %>
  </div>

model validation

  validates :project_id, presence: true

Answer 3

Alternatively, you could set the :project_id attribute in the controller, since the first argument of f.select pulls that particular attribute.