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<%= simple_form_for(@subject) do |f| %>
<%= f.error_notification %>
<%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>


<%= f.input :name %>
<%= f.association :teacher, label: "Assign a teacher to this subject", hint: "More than one teachers can be assigned to a subject", prompt: "Select teacher", :label_method => lambda { |teacher| teacher.fname + " " + teacher.lname } %>
<%= f.association :streams, as: :check_boxes, label: "Assign sets to this subject" %>


<%= f.button :submit %>

<% end %>

I am new to rails and to learn i'm creating a simple school system. In the system, there are subjects, teachers, students, forms (which are bascially grades eg. grade 1, 2...) and streams (A, B, or C). My subject and streams have a many to many association and the form and streams have a many to many association also.

For the subject creation, users enter the subject name, assign a teacher and select the streams the subject is taught in. My issue is that the streams show up but I want them to be displayed in an orderly manner according to the form they are assgined to.

Kinda like this:

Please Select the streams the subject is taught in

Form 1 streams
- A
- B
- C
Form 2 streams
- A
- B
-C

Currenrtly it shows up like this

Please Select the streams the subject is taught in

  • A
  • B
  • C
  • A
  • B
  • C

All my associations is in order it's just this I cant wrap my head around, I am using simple_form, here is the snipet of code I have.
<%= f.association :streams, as: :check_boxes, label: "Assign streams to this subject" %>

Thank you, for the help.

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