Unsure about how to use rails 3 check_box - ruby-on-rails-3

Question

I have a User form as follows, with a checkbox to set the user as admin:
<%= form_for #user do |f| %>
<%= render 'shared/error_messages', :object => f.object %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :email %><br />
<%= f.text_field :email %>
</div>
<div class="field">
<%= f.label :password %><br />
<%= f.password_field :password %>
</div>
<div class="field">
<%= f.label :password_confirmation, "Confirmation" %><br />
<%= f.password_field :password_confirmation %>
</div>
<%= hidden_field_tag :group_id, #group.id %>
**<div class="field">
<%= f.check_box :admin %>
</div>**
<div class="actions">
<%= f.submit "Sign up" %>
</div>
<% end %>
My Users table is as follows
create_table "users", :force => true do |t|
t.string "name"
t.datetime "created_at"
t.datetime "updated_at"
t.string "email"
t.string "encrypted_password"
t.string "salt"
t.boolean "admin", :default => false
t.integer "group_id"
end
And my User create action is as follows in my Users Controller
def create
#group = Group.find(params[:group_id])
#user = #group.users.build(params[:user])
if #user.save
flash[:success] = "You have created a new user"
redirect_to groups_path
else
#title = "Sign up"
render 'new'
end
end
But when I test user.admin for true, it doesn't show as true
<% #users.each do |user| %>
<li>
<%if user.admin == true %>
<%= link_to user.name, user %>
<% end%>
</li>
<% end %>
The form works fine otherwise, only the check_box doesn't set the user.admin to true. Have I missed a key step somewhere? thanks

Answer 1

Are you sure the value is getting set to true in the database? Check it out using dbconsole:
rails dbsconsole
If not, then you may need to make sure it's accessible in your User model:
attr_accessible :admin
Also, as a side note boolean values come with a bonus question mark method in ActiveRecord, so you could do this instead:
if user.admin?