Problem with impressionist gem

[benbruscella]

If I try to use the impressionist gem with rails_admin, I get this:

gems/activerecord-3.2.8/lib/active_record/dynamic_matchers.rb:50:in `method_missing': undefined local variable or method `is_impressionable' for #<Class:0x007fa48e882658> (NameError)
  from app/models/user.rb:3:in `<class:User>'
  from app/models/user.rb:1:in `<top (required)>'
  from gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `load'
  from gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `block in load_file'
  from config/initializers/rails_admin.rb:9:in `block in <top (required)>'
  from gems/rails_admin-0.0.5/lib/rails_admin.rb:29:in `call'
  from gems/rails_admin-0.0.5/lib/rails_admin.rb:29:in `config'
  from config/initializers/rails_admin.rb:1:in `<top (required)>'

Is this a rails_admin issue or impressionist issue?

Gem home is https://github.com/charlotte-ruby/impressionist

[mshibuya]

This appears to be related to #1185, and I can reproduce the problem for this time.

[benbruscella]

Thanks for the update @mshibuya

[mshibuya]

This is initialization order problem.

When using Impressionist(or Rolify) without RailsAdmin, app's initialization process should look like:

• load and execute files in config/initializers/*.rb
• ...
• execute engines' initializers
  • Impressionist's engine initializer extends ActiveRecord::Base(which defines is_impressionable method)
• ...
• Rails loads model classes
  • User model is loaded

But, after the installation of RailsAdmin:

• load and execute files in config/initializers/*.rb
  • load and execute config/initializers/rails_admin.rb, which refers to User model
    • so Rails loads User model, but Impressionist's AR extension is not loaded yet

so gives the error.

For workaround, you can eliminate reference of model classes from config/initializers/rails_admin.rb by moving configurations to your model class, as described in Wiki:

class User < ActiveRecord::Base
  ...

  rails_admin do
    field :name, ...
  end
end

But to solve this fundamentally, I need to be more familiarized with Rails initialization process.

[benbruscella]

Any update on this? No luck moving my configuration to the model.

[mshibuya]

Can you paste your RailsAdmin initializer here?

[benbruscella]

  config.model User do
    object_label_method do
      :custom_label_method
    end
    list do
      items_per_page 100
      field :id
      field :name do
        formatted_value do
          bindings[:view].tag(:img, { :src => bindings[:object].photo_url(:icon32) }) << "  " << value 
        end
      end
      field :email
      field :sign_in_count
    end
  end

[benbruscella]

I'm guessing "list" doesn't work in a model definition. Any other ideas?

[mshibuya]

What "doesn't work" means?

And I need full content of RailsAdmin initializer, not only config.model User block.
I want to make sure that early loading of User model doesn't occur throughout entire RA initializer.

[benbruscella]

RailsAdmin.config do |config|

  config.current_user_method { current_user }

  config.main_app_name = ['The Transfer Station', 'Admin Dashboard']

  config.authorize_with :cancan, AdminAbility

  config.model User do
    object_label_method do
      :custom_label_method
    end
    list do
      items_per_page 100
      field :id
      field :name do
        formatted_value do
          bindings[:view].tag(:img, { :src => bindings[:object].photo_url(:icon32) }) << "  " << value 
        end
      end
      field :email
      field :sign_in_count
    end
    edit do
      exclude_fields :password, :password_confirmation, :reset_password_sent_at, :remember_created_at, :sign_in_count, 
        :current_sign_in_at,
        :last_sign_in_at,
        :current_sign_in_ip,
        :last_sign_in_ip,
        :confirmation_token,
        :confirmed_at,
        :confirmation_sent_at,
        :coaching,
        :speaking
    end
  end

  config.model Course do
    list do
      items_per_page 100
      field :id
      field :title
      field :user
      field :trainer
      field :hub
      field :category_and_region
      field :starts_at
      field :status
    end
    edit do
      exclude_fields :tags, :to_delete_published, :latitude, :longitude, :gmaps,:bookmarkables, :orders
    end
  end

  config.model Hub do
    list do
      items_per_page 100
      field :name do
        formatted_value do
          bindings[:view].tag(:img, { :src => bindings[:object].logo_url(:icon32) }) << "  " << value 
        end
      end
      field :email
      field :address
      field :website
    end
    edit do
      exclude_fields :hub_members, :trainers, :administrators, :primary_administrators, :bookmarkables
    end
  end


end

[mshibuya]

I've just tried again and moving configurations to model classes works.
How did you do that?
Can you paste RA initializer and User class after moving configs?

[benbruscella]

Does this help at all?

#1428

[taavo]

Yeah, as described at the top of #1428, as long as you use 'User' instead of User, a regular initializer using config.model should defer model loading until well after initialization.

[benbruscella]

Now we have:

[RailsAdmin] Could not load model User, assuming model is non existing. (undefined local variable or method `is_impressionable' for #<Class:0x007f97e34528d8>)

[benbruscella]

did you want me to setup a fresh rails project for you to test this with?

[mshibuya]

I'm sorry for being away from here.
Create one, please!

[benbruscella]

Well, it seems to be fixed? Working repo:

https://github.com/benbruscella/raimpressionist

[davechisholm]

I'm having this same problem with the latest version of impressionist and rails admin as described here - http://stackoverflow.com/questions/24183344/conflict-between-rails-admin-and-impressionist-gems . I've tried the solutions mentioned here but still no luck - any ideas? It simply won't initialize when I have 'is_impressionable' in my model, so I have to keep commenting it out whenever I want to restart the server or generate a migration etc