Couldn't find Timetable with 'id'=clas - ruby-on-rails

Question

Generated a timetable scaffold. Then later created a new action "clas" in my timetables_controller.rb.
timetables_controller.rb
class TimetablesController < ApplicationController
before_action :set_timetable, only: [:show, :edit, :update, :destroy, :clas]
def clas
#classtimetable = Timetable.where(params[:clas])
end
//other actions
def set_timetable
#timetable = Timetable.find(params[:id])
end
def timetable_params
params.require(:timetable).permit(:day, :clas, :one_teacher, :one_sub, :two_teacher, :two_sub, :three_teacher, :three_sub, :four_teacher, :four_sub, :five_teacher, :five_sub, :six_teacher, :six_sub, :seven_teacher, :seven_sub, :eight_teacher, :eight_sub)
end
end
Created form_for to the action "clas". Need to pass the select option values as params to the controller
clas.html.erb
<% form_for #classtimetable, :url => clas_timetables_path, :html => { :method => :post} do |f| %>
<div class="field">
<%= f.label "Select class" %>
<% values = ["1c", "2c", "3c", "4d", "5i"] %>
<%= f.select :clas, options_for_select(values) %>
</div>
<div class="actions">
<%= f.submit "Submit"%>
</div>
<% end %>
<% #classtimetable.each do |class_timetable| %>
<%= class_timetable.day %>
<% end %>
routes.rb
resources :timetables do
member do
get 'clas'
end
end
I need to get all the day for the class in my clas.html.erb page. Which is done by selecting the class from dropdown and submit. The value should be passed in params when i click submit.
don't know how to fix it. Any ideas?

Answer 1

Add controller in form_for tag,
<% form_for #classtimetable, :url => { :controller => "your-controller-name", :action => :clas } do |f| %>
Or you can directly write like this,
<% form_for #classtimetable, :url => clas_timetables_path, :html => { :method => :post} do |f| %>
Change before_action like,
before_action :set_timetable, only: [:show, :edit, :update, :destroy, :clas]
You would change collection to member and pass id
resources :timetables do
member do
get 'clas'
end
end

Answer 2

Try to change your form_tag like this,
<% form_for #classtimetable, :url => clas_timetables_path(#classtimetable), :method => :post do |f| %>

Answer 3

Can you try this
def clas
#classtimetable = Timetable.where(timetable_params[:clas]).first
end

Answer 4

First I recognized: You used get in routes, and post in form. So the actions won't match.
Second: You've written:
still getting the same error undefined method `model_name' for Timetable::ActiveRecord_Relation:Class
So look, how you defined #classtimetable
#classtimetable = Timetable.where(params[:clas])
This is a relation, not the ActiveRecord, you want to find by clas. The error will be thrown on this line:
<% form_for #classtimetable, :url => clas_timetables_path, :html => { :method => :post} do |f| %>
form_for expects as first argument an ActiveRecord or something similar (at least something extending ActiveModel::Naming). Since I do not see your definition of Timetable, I just guess, it has an attribute called clas and you want to find the Timetable with clas equals the selection in that form. So it would be:
#classtimetable = Timetable.find_by(clas: params[:clas])
what is the same as:
#classtimetable = Timetable.where(clas: params[:clas]).first
To get the first element from that Relation, you tried to use.
Third: Since you did define your route to be a member route, it should expect an id in clas_timetable_path. Since you load #timetable in clas action in before_filter, I think you want to have there:
<% form_for #classtimetable, :url => clas_timetables_path(#timetable), :html => { :method => :get} do |f| %>