How to use concerns in routes ruby on rails - ruby-on-rails

Question

I have resources :subjects in my routes which I wants to use as optional routes by using concern.
The idea is to use DRY approach so I do not need to re-write routes lines for other case in which I do not need resources :subjects.
The links are like below and it is clear I have no subject_id in 2nd case as I do not need it:
http://localhost:3000/teacher/katherine-fleming/subjects/3/lesson_plans/3
and
http://localhost:3000/teacher/carmel-cynthia/lesson_plans/3
Right now, it stops working for both cases and saying:
ActionController::RoutingError (No route matches [GET] "/teacher
/katherine-fleming/subjects/3/lesson_plans/3"):
ActionController::RoutingError (No route matches [GET] "/teacher/carmel-
cynthia/lesson_plans/68"):
My routes for case 1 are:
resources :subjects do
concern :lesson_plans, :except => [:index] do
resources :lesson_plan_registrations
resources :comments, only: [:new, :create, :destroy]
end
end
I am trying to make them working using below code but its not working as expected.
resources :lesson_plans, concerns: :lesson_plans
What's working right now is:
resources :subjects do
resources :lesson_plans, :except => [:index] do
resources :lesson_plan_registrations
resources :comments, only: [:new, :create, :destroy]
end
end
resources :lesson_plans, :except => [:index] do
resources :lesson_plan_registrations
resources :comments, only: [:new, :create, :destroy]
end
But its something to re-write the whole code again for the case in which I do not need resources :subjects.
I want to use DRY approach so it will work for both cases.
Here are full routes.rb file:
Rails.application.routes.draw do
root 'welcome#index'
devise_for :users, controllers: {sessions: 'sessions', registrations: 'registrations', :omniauth_callbacks => 'omniauth_callbacks'}
resources :requested_schools, only: [:new, :create]
resources :tags, only: :index
resources :specializations, only: :index
resources :search, only: :index
get '/fetch_schools' => 'search#fetch_schools'
get '/fetch_subjects' => 'search#fetch_subjects'
resources :search_results do
collection do
get '/lesson_plan' => 'search_results#lesson_plan', as: :lesson_plan
get '/video' => 'search_results#video', as: :video
get '/document' => 'search_results#document', as: :document
get '/note' => 'search_results#note', as: :note
end
end
namespace :admin do
root 'dashboard#index'
get 'login' => 'sessions#new', as: :login
resources :dashboard, only: [:index]
resources :requested_schools, only: [:index, :edit, :edit, :show, :destroy] do
member do
get :accept_request
get :decline_request
get 'view_files' => 'requested_schools#view_files', as: :view_files
get 'imported_data' => 'requested_schools#imported_data', as: :imported_data
end
end
resource :users, :except => [:show, :index, :new, :create] do
member do
get :change_password
patch :update_password
end
end
end
namespace :school do
root 'dashboard#index'
resources :dashboard, :path => '/', only: [:index]
resources :departments do
resources :subjects
end
resources :class_rooms do
resources :class_room_subjects
resources :class_room_schedules
resources :class_room_registrations do
collection do
post "/student_registration" => "class_room_registrations#student_registration", as: :student_registration
end
end
end
get '/fetch_subject_teachers' => 'class_room_subjects#fetch_subject_teachers', as: :fetch_subject_teachers
resources :schools, :path => '/', only: [:index, :edit, :show, :destroy, :update] do
collection do
get :change_password
patch :update_password
get :edit_profile
patch :update_profile
get :listing
get :view_ids
match "/upload_ids" => "schools#upload_ids", via: [:get, :post]
get :autocomplete_school_name
get '/view_lesson_plan/:id' => "schools#view_lesson_plan", as: :view_lesson_plan
end
member do
get :students
get :teachers
get :lesson_plans
match '/class_rooms' => "class_rooms#index", via: [:get, :post]
end
end
end
resources :friend_requests do
member do
get '/send_friend_request/:type' => "friend_requests#send_friend_request", as: :send_friend_request
get '/decline_friend_request/:type' => "friend_requests#decline_friend_request", as: :decline_friend_request
get '/accept_friend_request/:type' => "friend_requests#accept_friend_request", as: :accept_friend_request
get '/cancel_friend_request/:type' => "friend_requests#cancel_friend_request", as: :cancel_friend_request
get '/unfriend' => "friend_requests#unfriend", as: :unfriend
end
collection do
get :friend_requests
end
end
namespace :student do
resources :students, :path => '/' do
member do
get :friends
get :lesson_plan_progress
post "/join_private_school/:school_id" => "students#join_private_school", as: :join_private_school
get "/private_schools" => "students#private_schools", as: :private_schools
end
collection do
get :departments
post :select_departments
get :list_departments
get :my_lesson_plan
get :special_lesson_plans
end
get '/view_result/:id' => "students#view_result", as: :view_result
get '/lesson_plan/:id' => "students#lesson_plan", as: :lesson_plan
get '/video/:id' => "students#video", as: :video
post '/video_comments/:id' => "students#video_comments", as: :video_comments
get '/like_video/:id' => "students#like_video", as: :like_video
get '/liked_video_users/:id' => "students#liked_video_users", as: :liked_video_users
get '/is_video_completed' => "students#is_video_completed", as: :is_video_completed
get '/assignment_result/:id' => "students#assignment_result", as: :assignment_result
end
resource :users, :except => [:show, :index, :new, :create] do
member do
get :change_password
patch :update_password
end
end
end
namespace :teacher do
resources :teachers, :path => '/' do
resources :subjects do
resources :lesson_plans, :except => [:index] do
member do
get '/change_public' => "lesson_plans#change_public", as: :change_public
get '/change_private' => "lesson_plans#change_private", as: :change_private
post '/copy_lesson_plan' => "lesson_plans#copy_lesson_plan", as: :copy_lesson_plan
get '/play_list_progress' => "lesson_plans#list_play_list_progress", as: :list_play_list_progress
end
resources :lesson_plan_registrations, :only => [:new, :create, :edit, :update]
post '/move_up_down_play_list' => 'lesson_plans#move_up_down_play_list', as: :move_up_down_play_list
resources :comments, only: [:new, :create, :destroy]
resources :videos do
member do
get '/like_video' => "videos#like_video", as: :like_video
get '/liked_video_users' => "videos#liked_video_users", as: :liked_video_users
get '/delete_video_comment' => "videos#delete_video_comment", as: :delete_video_comment
get '/is_video_completed' => "videos#is_video_completed", as: :is_video_completed
post '/copy_video' => "videos#copy_video", as: :copy_video
end
end
resources :documents do
member do
get '/download_file' => "documents#download_file", as: :download_file
get '/like_document' => "documents#like_document", as: :like_document
get '/liked_document_users' => "documents#liked_document_users", as: :liked_document_users
post '/copy_document' => "documents#copy_document", as: :copy_document
end
end
resources :notes do
member do
get '/like_note' => "notes#like_note", as: :like_note
get '/liked_note_users' => "notes#liked_note_users", as: :liked_note_users
end
end
resources :quizzes do
member do
get '/like_quiz' => "quizzes#like_quiz", as: :like_quiz
get '/liked_quiz_users' => "quizzes#liked_quiz_users", as: :liked_quiz_users
match '/change_public' => "quizzes#change_public", as: :change_public, via: [:get, :post]
get '/give_quiz' => "quizzes#give_quiz", as: :give_quiz
get '/preview_quiz' => "quizzes#preview_quiz", as: :preview_quiz
post '/copy_quiz' => "quizzes#copy_quiz", as: :copy_quiz
end
resources :questions do
collection do
get '/fetch_question_options' => 'questions#fetch_question_options'
match '/search_questions' => 'questions#search_questions', as: :search_questions, via: [:get, :post]
post '/select_questions' => 'questions#select_questions', as: :select_questions
end
end
resources :question_groups
resources :sort_questions, only: [:index]
post '/move_up_down' => 'sort_questions#move_up_down', as: :move_up_down
resources :quiz_answers, only: [:new, :create]
resources :quiz_attempts do
member do
get '/download_file' => "quiz_attempts#download_file", as: :download_file
end
end
end
resources :question_banks do
member do
get :fetch_picks
end
resources :sort_questions, only: [:index]
resources :questions do
member do
post :move
end
collection do
get '/fetch_question_options' => 'questions#fetch_question_options'
end
end
end
resources :assignments do
member do
match '/change_public' => "assignments#change_public", as: :change_public, via: [:get, :post]
get '/like_assignment' => "assignments#like_assignment", as: :like_assignment
get '/liked_assignment_users' => "assignments#liked_assignment_users", as: :liked_assignment_users
get '/download_file' => "assignments#download_file", as: :download_file
post '/copy_assignment' => "assignments#copy_assignment", as: :copy_assignment
end
resources :assignment_submissions do
member do
get '/download_file' => "assignment_submissions#download_file", as: :download_file
post '/mark_assignment' => "assignment_submissions#mark_assignment", as: :mark_assignment
end
end
end
end
end
resources :lesson_plans do
resources :videos
resources :documents
resources :notes
resources :quizzes do
member do
match '/change_public' => "quizzes#change_public", as: :change_public, via: [:get, :post]
get '/preview_quiz' => "quizzes#preview_quiz", as: :preview_quiz
end
resources :questions
resources :quiz_attempts do
member do
get '/download_file' => "quiz_attempts#download_file", as: :download_file
end
end
end
resources :question_banks
resources :assignments
end
resources :class_rooms, :only => [:index] do
resources :subjects do
resources :subject_grades, only: [:index] do
collection do
get "/mark_complete" => "subject_grades#mark_complete", as: :mark_complete
end
end
resources :class_room_subjects, only: [:update]
resources :lessons do
resources :attendances, only: [:index]
end
end
end
resources :private_schools do
resources :invitation_promo_codes
resources :private_classes do
member do
get :new_private_lesson_plan
post :create_private_lesson_plan
get "/edit_private_lesson_plan/:private_lesson_plan_id" => "private_classes#edit_private_lesson_plan", as: :edit_private_lesson_plan
post "/update_private_lesson_plan/:private_lesson_plan_id" => "private_classes#update_private_lesson_plan", as: :update_private_lesson_plan
get "/destroy_private_lesson_plan/:private_lesson_plan_id" => "private_classes#destroy_private_lesson_plan", as: :destroy_private_lesson_plan
end
end
end
member do
get :friends
get '/lesson_plans' => "lesson_plans#index", as: :lesson_plans
get '/my_class_rooms' => "class_rooms#index", as: :my_class_rooms
get :new_promo_code
post :create_promo_code
post :leave_private_school
end
collection do
get :departments
post :select_departments
get '/:teacher_id/invitation_promo_codes' => "invitation_promo_codes#index", as: :invitation_promo_codes
end
end
resource :users, :except => [:show, :index, :new, :create] do
member do
get :change_password
patch :update_password
end
end
end
get '/notifications' => 'users#notifications', as: :notifications
delete '/delete_notification/:id' => 'users#delete_notification', as: :delete_notification
get '/notification_status' => 'users#notification_status'
end

Answer 1

You can try this in your routes:
def lesson_plans
resources :lesson_plans, :except => [:index] do
resources :lesson_plan_registrations
resources :comments, only: [:new, :create, :destroy]
end
end
resources :subjects do
lesson_plans
end
lesson_plans

Answer 2

Better way,
concern :lesson_plans do
resources :lesson_plans, :except => [:index] do
resources :lesson_plan_registrations
resources :comments, only: [:new, :create, :destroy]
end
end
resources :subjects do
concerns :lesson_plans
end
concerns :lesson_plans