Question

class SubjectTeachersController < ApplicationController

def new
  @st = SubjectTeacher.new   
  @tnames = Teacher.pluck(:tname)
  @subs = Subject.pluck(:sub_name)

end    

def create
   @tech = Teacher.find(params[:tname]).id
   @sub = Subject.find(params[:sub_name]).id
   @st = SubjectTeacher.create(:teacher_id => @tech, :subject_id => @sub )
    if @st.save
        flash[:notice] = " creates successfully"
    else
      render('new')
        end    
  end   
end 

I created mamy to many relationship between Subject & Teacher. SubjectTeacher is join table of Subject & Teacher. In SubjectTeacherController.

here, @tnames stores all the teacher name while @subs stores all subjects name. I want to access the id of both in controller…HOW?
Is any changes shall I do in create function? plz tel me…

Answer 1

Rails provides ‘magic’ finder methods, of the form Model.find_by_attribute.

In this case, we can use Teacher.find_by_tname(params[:tname]) and Subject.find_by_sub_name(params[:subname])