RailsAdmin & letsrate Error (Rails4)

[initabas]

After installation of letsrate
when I'm trying to edit any of my model in RailsAdmin I get

ActiveRecord::Reflection::ThroughReflection#foreign_key delegated to source_reflection.foreign_key, but source_reflection is nil

but in general letsrate works!

[kiryl-t]

These links helped me to solve the problem (actually I've got the error on dashboard load)
http://stackoverflow.com/questions/16677703/source-reflection-errors-with-has-many-through
https://github.com/muratguzel/letsrate/blob/master/lib/letsrate/model.rb

Instead of writing

letsrate_rateable :content

in my model, I've copied "letsrate_rateable" method code and specified the source_type for has_many *_raters association.
So I've got something like this

has_many :rates_without_dimension, :as => :rateable, :class_name => "Rate", :dependent => :destroy, :conditions => {:dimension => nil}
has_many :raters_without_dimension, :through => :rates_without_dimension, :source => :rater

has_one :rate_average_without_dimension, :as => :cacheable, :class_name => "RatingCache",
        :dependent => :destroy, :conditions => {:dimension => nil}

has_many :content_rates, :dependent => :destroy,
         :conditions => {:dimension => :content.to_s},
         :class_name => "Rate",
         :as => :rateable

has_many :content_raters, :through => :content_rates, :source => :rater, **:source_type => "User"**

has_one :content_average, :as => :cacheable, :class_name => "RatingCache",
        :dependent => :destroy, :conditions => {:dimension => :content.to_s}

And it works.

[yawo]

Tx a lot

Your solution works fine.

There was indeed that problem.
Another one was a to_sym missing in letsrate code on

has_many "#{dimension}_raters".to_sym, :through => "#{dimension}_rates", :source => :rater

it should be

has_many "#{dimension}_raters".to_sym, :through => "#{dimension}_rates".to_sym, :source => :rater

As I had many models, I put my code in a concern under app/models/concerns.
app/models/concerns/myletsrate.rb :

require 'active_support/concern'
module Concerns::Myletsrate  extend  ActiveSupport::Concern
  module ClassMethods
    def my_letsrate_rateable(*dimensions)

      has_many :rates_without_dimension, -> { where dimension: nil}, :as => :rateable, :class_name => "Rate", :dependent => :destroy
      has_many :raters_without_dimension, :through => :rates_without_dimension, :source => :rater

      has_one :rate_average_without_dimension, -> { where dimension: nil}, :as => :cacheable,
              :class_name => "RatingCache", :dependent => :destroy


      dimensions.each do |dimension|
        has_many "#{dimension}_rates".to_sym, -> {where dimension: dimension.to_s},
                 :dependent => :destroy,
                 :class_name => "Rate",
                 :as => :rateable

        has_many "#{dimension}_raters".to_sym, :through => "#{dimension}_rates".to_sym, :source => :rater, source_type: "User"

        has_one "#{dimension}_average".to_sym, -> { where dimension: dimension.to_s },
                :as => :cacheable, :class_name => "RatingCache",
                :dependent => :destroy
      end

    end
  end
end

Then add this to config/initializers/rails_admin.rb:

config.excluded_models = Dir.glob(Rails.root.join('app/models/concerns/**.rb')).map {|p| 'Concerns::' + File.basename(p, '.rb').camelize }

Finally in each model rateable I add this

  include Concerns::Myletsrate
  my_letsrate_rateable "feelings"

It works.