Introduce per_page parameter for custom page size

app/controllers/consumers_controller.rb

@@ -28,7 +28,7 @@ class ConsumersController < ApplicationController
   private :consumer_params
 
   def index
-    @consumers = Consumer.paginate(page: params[:page])
+    @consumers = Consumer.paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/error_template_attributes_controller.rb

@@ -12,7 +12,7 @@ class ErrorTemplateAttributesController < ApplicationController
   # GET /error_template_attributes.json
   def index
     @error_template_attributes = ErrorTemplateAttribute.all.order('important DESC', :key,
-      :id).paginate(page: params[:page])
+      :id).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/error_templates_controller.rb

@@ -11,7 +11,7 @@ class ErrorTemplatesController < ApplicationController
   # GET /error_templates
   # GET /error_templates.json
   def index
-    @error_templates = ErrorTemplate.all.order(:execution_environment_id, :name).paginate(page: params[:page])
+    @error_templates = ErrorTemplate.all.order(:execution_environment_id, :name).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/execution_environments_controller.rb

@@ -121,7 +121,7 @@ class ExecutionEnvironmentsController < ApplicationController
   private :execution_environment_params
 
   def index
-    @execution_environments = ExecutionEnvironment.all.includes(:user).order(:name).paginate(page: params[:page])
+    @execution_environments = ExecutionEnvironment.all.includes(:user).order(:name).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/exercise_collections_controller.rb

@@ -6,7 +6,7 @@ class ExerciseCollectionsController < ApplicationController
   before_action :set_exercise_collection, only: %i[show edit update destroy statistics]
 
   def index
-    @exercise_collections = ExerciseCollection.all.paginate(page: params[:page])
+    @exercise_collections = ExerciseCollection.all.paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/exercises_controller.rb

@@ -103,7 +103,7 @@ raise: false
 
   def feedback
     authorize!
-    @feedbacks = @exercise.user_exercise_feedbacks.paginate(page: params[:page])
+    @feedbacks = @exercise.user_exercise_feedbacks.paginate(page: params[:page], per_page: per_page_param)
     @submissions = @feedbacks.map do |feedback|
       feedback.exercise.final_submission(feedback.user)
     end
@@ -410,7 +410,7 @@ working_time_accumulated: working_time_accumulated})
 
   def index
     @search = policy_scope(Exercise).ransack(params[:q])
-    @exercises = @search.result.includes(:execution_environment, :user).order(:title).paginate(page: params[:page])
+    @exercises = @search.result.includes(:execution_environment, :user).order(:title).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/external_users_controller.rb

@@ -10,7 +10,7 @@ class ExternalUsersController < ApplicationController
 
   def index
     @search = ExternalUser.ransack(params[:q])
-    @users = @search.result.in_study_group_of(current_user).includes(:consumer).paginate(page: params[:page])
+    @users = @search.result.in_study_group_of(current_user).includes(:consumer).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/file_templates_controller.rb

@@ -19,7 +19,7 @@ class FileTemplatesController < ApplicationController
   # GET /file_templates
   # GET /file_templates.json
   def index
-    @file_templates = FileTemplate.all.order(:file_type_id).paginate(page: params[:page])
+    @file_templates = FileTemplate.all.order(:file_type_id).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/file_types_controller.rb

@@ -33,7 +33,7 @@ class FileTypesController < ApplicationController
   private :file_type_params
 
   def index
-    @file_types = FileType.all.includes(:user).order(:name).paginate(page: params[:page])
+    @file_types = FileType.all.includes(:user).order(:name).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/internal_users_controller.rb

@@ -63,7 +63,7 @@ class InternalUsersController < ApplicationController
 
   def index
     @search = InternalUser.ransack(params[:q])
-    @users = @search.result.includes(:consumer).order(:name).paginate(page: params[:page])
+    @users = @search.result.includes(:consumer).order(:name).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/proxy_exercises_controller.rb

@@ -51,7 +51,7 @@ class ProxyExercisesController < ApplicationController
 
   def index
     @search = policy_scope(ProxyExercise).ransack(params[:q])
-    @proxy_exercises = @search.result.order(:title).paginate(page: params[:page])
+    @proxy_exercises = @search.result.order(:title).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/request_for_comments_controller.rb

@@ -23,7 +23,7 @@ class RequestForCommentsController < ApplicationController
       .where(exercises: {unpublished: false})
       .includes(submission: [:study_group])
       .order('created_at DESC')
-      .paginate(page: params[:page], total_entries: @search.result.length)
+      .paginate(page: params[:page], per_page: per_page_param, total_entries: @search.result.length)
 
     authorize!
   end
@@ -36,7 +36,7 @@ class RequestForCommentsController < ApplicationController
       .ransack(params[:q])
     @request_for_comments = @search.result
       .order('created_at DESC')
-      .paginate(page: params[:page])
+      .paginate(page: params[:page], per_page: per_page_param)
     authorize!
     render 'index'
   end
@@ -50,7 +50,7 @@ class RequestForCommentsController < ApplicationController
       .ransack(params[:q])
     @request_for_comments = @search.result
       .order('last_comment DESC')
-      .paginate(page: params[:page])
+      .paginate(page: params[:page], per_page: per_page_param)
     authorize!
     render 'index'
   end
@@ -65,7 +65,7 @@ class RequestForCommentsController < ApplicationController
     @request_for_comments = @search.result
       .joins(:exercise)
       .order('last_comment DESC')
-      .paginate(page: params[:page])
+      .paginate(page: params[:page], per_page: per_page_param)
     # let the exercise decide, whether its rfcs should be visible
     authorize(exercise)
     render 'index'

app/controllers/study_groups_controller.rb

@@ -7,7 +7,7 @@ class StudyGroupsController < ApplicationController
 
   def index
     @search = policy_scope(StudyGroup).ransack(params[:q])
-    @study_groups = @search.result.includes(:consumer).order(:name).paginate(page: params[:page])
+    @study_groups = @search.result.includes(:consumer).order(:name).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/submissions_controller.rb

@@ -65,7 +65,7 @@ class SubmissionsController < ApplicationController
 
   def index
     @search = Submission.ransack(params[:q])
-    @submissions = @search.result.includes(:exercise, :user).paginate(page: params[:page])
+    @submissions = @search.result.includes(:exercise, :user).paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/tags_controller.rb

@@ -28,7 +28,7 @@ class TagsController < ApplicationController
   private :tag_params
 
   def index
-    @tags = Tag.all.paginate(page: params[:page])
+    @tags = Tag.all.paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/controllers/tips_controller.rb

@@ -34,7 +34,7 @@ class TipsController < ApplicationController
   private :tip_params
 
   def index
-    @tips = Tip.all.paginate(page: params[:page])
+    @tips = Tip.all.paginate(page: params[:page], per_page: per_page_param)
     authorize!
   end
 

app/helpers/application_helper.rb

@@ -34,6 +34,14 @@ module ApplicationHelper
     tag.i(nil, class: 'fa fa-times')
   end
 
+  def per_page_param
+    if params[:per_page]
+      [params[:per_page].to_i, 100].min
+    else
+      WillPaginate.per_page
+    end
+  end
+
   def progress_bar(value)
     tag.div(class: value ? 'progress' : 'disabled progress') do
       tag.div(value ? "#{value}%" : '', 'aria-valuemax': 100, 'aria-valuemin': 0,