How can I make a radio button selected by default?

[planon]

I need the default value to be "Lbs", and this is how I set it up:


=f.input :weight_unit, :label=>"Unit", :collection=>["Lbs","Kg"], :as=>:radio, :priority=>["Lbs"]


But it's not working. Does anyone know how this can be done?

[Ingo Gambin]

my first choice to preset radio- or checkbox-selections would be setting them in the new-action of the according controller

#app/models/user.rb

class User < ActiveRecord::Base

  belongs_to :department

end

#app/models/department.rb

class Department < ActiveRecord::Base

  has_many :users

end

#app/controllers/users_controller.rb

  # GET /users/new

  # GET /users/new.xml

  def new

    @user = User.new

    @user.department_id= Department.find_by_name('IT')

    respond_to do |format|

      format.html # new.html.erb

      format.xml  { render :xml => @user }

    end

  end

#app/views/users/_form.html.erb 

<%= simple_form_for(@user) do |f| %>

  <%= f.input :name %><br />

  <%= f.input :age %>

  <%= f.association :department, :as => :radio %>

  <%= f.button :submit %>

<% end %>

In your case you might just preset your 'new' object in your objects controller new-action with the according string 

def new 

   @myobject = Myobject.new

   @myobject.weight_unit= "Lbs"

   respond_to

    ...

end

2011/3/29 planon <spocks...@gmail.com>

[Carlos Antonio da Silva]

You can also give the :checked option, Instead of :priority. It might not be an array also, if you don't want more than one item to be selected.

--
At.
Carlos A. da Silva