Remove Ransack from Exercise edit for tags

* Also improve Ransack usage of attributes and associations

app/controllers/exercises_controller.rb

@@ -461,8 +461,7 @@ class ExercisesController < ApplicationController
   private :set_file_types
 
   def collect_set_and_unset_exercise_tags
-    @search = policy_scope(Tag).ransack(params[:q])
+    @tags = policy_scope(Tag)
-    @tags = @search.result.order(:name)
     checked_exercise_tags = @exercise.exercise_tags
     checked_tags = checked_exercise_tags.collect(&:tag).to_set
     unchecked_tags = Tag.all.to_set.subtract checked_tags

app/models/application_record.rb

@@ -15,4 +15,12 @@ class ApplicationRecord < ActiveRecord::Base
       end
     end
   end
+
+  def self.ransackable_associations(_auth_object = nil)
+    []
+  end
+
+  def self.ransackable_attributes(_auth_object = nil)
+    []
+  end
 end

app/models/execution_environment.rb

@@ -61,6 +61,10 @@ class ExecutionEnvironment < ApplicationRecord
     exposed_ports.join(', ')
   end
 
+  def self.ransackable_attributes(_auth_object = nil)
+    %w[id]
+  end
+
   private
 
   def set_default_values

app/models/exercise.rb

@@ -597,4 +597,12 @@ cause: %w[submit assess remoteSubmit remoteAssess]}).distinct
           WHERE exercise_id = #{id}
         ) AS t ON t.fv = submissions.id").distinct
   end
+
+  def self.ransackable_attributes(_auth_object = nil)
+    %w[title]
+  end
+
+  def self.ransackable_associations(_auth_object = nil)
+    %w[execution_environment]
+  end
 end

app/models/exercise_collection.rb

@@ -31,4 +31,8 @@ working_time: time_to_f(item.exercise.average_working_time)}
   def to_s
     "#{I18n.t('activerecord.models.exercise_collection.one')}: #{name} (#{id})"
   end
+
+  def self.ransackable_attributes(_auth_object = nil)
+    %w[id]
+  end
 end

app/models/proxy_exercise.rb

@@ -246,4 +246,8 @@ class ProxyExercise < ApplicationRecord
   def select_easiest_exercise(exercises)
     exercises.order(:expected_difficulty).first
   end
+
+  def self.ransackable_attributes(_auth_object = nil)
+    %w[title]
+  end
 end

app/models/request_for_comment.rb

@@ -77,6 +77,14 @@ class RequestForComment < ApplicationRecord
       # ugly, but necessary
     end
 
+    def ransackable_associations(_auth_object = nil)
+      %w[exercise submission]
+    end
+
+    def ransackable_attributes(_auth_object = nil)
+      %w[solved]
+    end
+
     private
 
     def row_number_user_sql

app/models/submission.rb

@@ -191,6 +191,10 @@ class Submission < ApplicationRecord
     result.merge(output)
   end
 
+  def self.ransackable_attributes(_auth_object = nil)
+    %w[study_group_id]
+  end
+
   private
 
   def prepared_runner

app/models/user.rb

@@ -41,4 +41,8 @@ class User < ApplicationRecord
   def to_s
     displayname
   end
+
+  def self.ransackable_attributes(_auth_object = nil)
+    %w[name email external_id consumer_id role]
+  end
 end

app/views/exercises/_form.html.slim

@@ -69,7 +69,7 @@
             thead
               tr
                 th = t('activerecord.attributes.exercise.selection')
-                th = sort_link(@search, :title, t('activerecord.attributes.tag.name'))
+                th = t('activerecord.attributes.tag.name')
                 th = t('activerecord.attributes.tag.difficulty')
               = collection_check_boxes :exercise, :tag_ids, @exercise_tags, :tag_id, :id do |b|
                 tr