Question

I am working on a Rails 3.1.1 app that is using WICE_GRID and I am stuck on this error.
I want to show a grid of Roles on the User show page. I am setting up the data in the controller like this.
User and Role are related by has_many through user_role.

def show
  @user = User.find(params[:id])
  @roles = initialize_grid(@user.roles)
end

When I run the site I get this error

Wice::WiceGridArgumentError in UsersController#show
WiceGrid: ActiveRecord model class (second argument) must be a Class derived from ActiveRecord::Base

The error is pointing to @roles = init…. line. initialize_grid does take a record arguent but that is a hash of options, not an activerecord model collection.
When I run the code in the console I see that @user.roles is

[#<Role id: 1, title: "Role1>, #<Role id: 2, title: "Role2">]

Looks like an ActiveRecord collection to me.

Any help gratefully accepted!

Answer 1

initialize_grid takes a class. You’re passing in an array of objects. It appears you want to display a user’s roles in the grid. You want something like this:

def show
  @user = User.find(params[:id])
  @roles = initialize_grid(Role, :conditions => ['user_id = ?', @user.id])
end

However, I’m guessing your roles table doesn’t have user_id in it. You likely have a mapping table called user_roles. In which case, you will want to refactor the code above. Try just running this code instead to make sure you can view Roles in a grid (unscoped).

def show
  @user = User.find(params[:id])
  @roles = initialize_grid(Role)
end