Show field only if user.is? :admin

[Gpx]

Hello I'm building a small web site. Basically there are a User and a
Event models. The associations are User has_many :events and Event
belongs_to :user.
Every user can be a guest or an administrator. I've also have a method
user.is?(:role).
If a guest creates a new event it is automatically associated to it,
instead if an admin creates an event he can choose to associate it to
whoever he wants.

So I need to hide the user field if the current_user is a guest and
set its default value to current_user.id, but if the user is an admin
he can modify the field.

I've tried this https://github.com/sferik/rails_admin/wiki/How-to-set-default-values
but is not working for me because if I set the field as "visible
false" the value is no longer passed to the controller.

Someone knows how to solve my problem?

Thanks.

[Benoit Bénézech]

Add a hidden field.

field :my_field, :hidden do

  default_value do

    ..

  end

end

field :my_field_override do

  visible do 

    bindings[:user].role == :admin

  end

end

And then deal with my_field/my_field_override in your model.

[Gpx]

There isn't just a way to set the field as hidden only under a condition?

[Benoit Bénézech]

No. Because it depends on the field's class.

But you can hack the render method (and render the field conditionally).

[Gpx]

You mean something like

render do

  if bindings[:view]._current_user.is? :admin

    #something

  else

    #something else

  end

end

But I don't know what to put where there are the comments.

[Benoit Bénézech]

#1 Copy that line:

https://github.com/sferik/rails_admin/blob/master/lib/rails_admin/config/fields/base.rb#L207

#2 Smtg like:

  bindings[:form].hidden_field(self.method_name, :value => self.value) + 

  self.pretty_value

[Gpx]

It works! Now I have only to figure out how to hide the label.

Thanks.

[Benoit Bénézech]

Yeah, you may need some JS targetting for that, since the outer CSS classes won't change and you can't control them at the moment.

[Glauco Custódio]

This post can help you: http://blog.glaucocustodio.com/2013/11/28/conditional-fields-in-rails-admin/

Bye.