Adding Association to Join Table for HaBtM Relationship - ruby-on-rails

Question

I currently have 3 models (user, pairing, meetings), and the join table meetings_pairings.
User.rb
class User < ActiveRecord::Base
enum role: [:student, :supervisor, :admin]
has_many :students, class_name: "User",
foreign_key: "supervisor_id"
belongs_to :supervisor, class_name: "User"
has_and_belongs_to_many :pairings
end
Pairings.rb
class Pairing < ActiveRecord::Base
has_and_belongs_to_many :supervisor, class_name: 'User'
belongs_to :student, class_name: 'User'
has_and_belongs_to_many :meetings, join_table: :meetings_pairings
end
Meetings.rb
class Meeting < ActiveRecord::Base
enum status: [:available, :unavailable]
has_and_belongs_to_many :pairings, join_table: :meetings_pairings
end
Schema.rb (relevant bits)
create_table "meetings", force: :cascade do |t|
t.date "meeting_date"
t.datetime "meeting_time"
t.integer "status", default: 0, null: false
t.boolean "accepted"
end
create_table "meetings_pairings", id: false, force: :cascade do |t|
t.integer "pairing_id"
t.integer "meeting_id"
end
add_index "meetings_pairings", ["meeting_id"], name: "index_meetings_pairings_on_meeting_id"
add_index "meetings_pairings", ["pairing_id"], name: "index_meetings_pairings_on_pairing_id"
create_table "pairings", force: :cascade do |t|
t.integer "supervisor_id"
t.integer "student_id"
t.string "project_title"
end
add_index "pairings", ["student_id"], name: "index_pairings_on_student_id", unique: true
add_index "pairings", ["supervisor_id"], name: "index_pairings_on_supervisor_id"
I created the view and controller to enable a user (supervisor, which is in a pairing) to create a meeting. However I don't know how to add this association to the join table.
meetings_controller.rb
class MeetingsController < ApplicationController
def index
#meetings = Meeting.all
end
def new
#meeting = Meeting.new
end
def create
#meeting = Meeting.new(meeting_params)
if #meeting.save
redirect_to meetings_path, :notice => "Meeting Created!"
else
redirect_to meetings_path, :notice => "Meeting Failed!"
end
end
def show
#meeting = Meeting.find(params[:id])
end
private
def meeting_params
params.require(:meeting).permit(:meeting_date, :meeting_time)
end
end
Form from the view
<%= form_for #meeting do |f| %>
<div class="field">
<%= f.label :meeting_date %><br />
<%= f.text_field :meeting_date %>
</div>
<div class="field">
<%= f.label :meeting_time %><br />
<%= f.time_select :meeting_time, :ampm => true, :minute_step => 30, :default => {:hour => '9', :minute => '0'} %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
This creates an entry in the meetings table, so my question is how can I make it so that an entry is made into the join table with the pairing id of the current user who created the meeting ?

Answer 1

Decided to use a has_many :through (user-meeting-user) relationship instead. Question no longer relevant.