Katha (and related) Models + Migration

app/models/chapter.rb

@@ -4,4 +4,7 @@ class Chapter < ApplicationRecord
   belongs_to :book
   has_many :chhands, :dependent => :destroy
   has_many :pauris, :dependent => :destroy
+  has_many :tuks, :through => :pauris
+  has_many :chapter_kathas, :dependent => :destroy
+  has_many :kathas, :through => :chapter_kathas
 end

app/models/chapter_katha.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class ChapterKatha < ApplicationRecord
+  belongs_to :katha
+  belongs_to :chapter
+end

app/models/giani.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class Giani < ApplicationRecord
+  has_many :kathas, :dependent => :destroy
+end

app/models/katha.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class Katha < ApplicationRecord
+  belongs_to :giani
+  has_many :chapter_kathas, :dependent => :destroy
+  has_many :chapters, :through => :chapter_kathas, :dependent => :destroy
+end

db/migrate/20230603170655_create_kathas_and_gianis_and_chapter_kathas.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+class CreateKathasAndGianisAndChapterKathas < ActiveRecord::Migration[7.0]
+  def up
+    create_table :gianis do |t|
+      t.string :name, :null => false
+      t.string :artwork_url
+
+      t.timestamps
+    end
+
+    create_table :kathas do |t|
+      t.references :giani, :null => false, :foreign_key => true
+      t.string :title
+      t.string :public_url
+      t.string :soundcloud_url
+      t.integer :year
+
+      t.timestamps
+    end
+
+    create_table :chapter_kathas do |t|
+      t.references :chapter, :null => false, :foreign_key => true
+      t.references :katha, :null => false, :foreign_key => true
+
+      t.timestamps
+    end
+
+    # Seeding Gianis
+    Giani.create!([
+      { :id => 1, :name => 'Giani Harbhajan Singh Dhudike' },
+      { :id => 2, :name => 'Nihang Giani Sher Singh Ambala' },
+      { :id => 3, :name => 'Sant Giani Inderjit Singh Raqbewale' },
+      { :id => 4, :name => 'Bhai Sukha Singh UK' },
+      { :id => 5, :name => 'The Suraj Podcast' }
+    ])
+  end
+
+  def down
+    drop_table :gianis
+    drop_table :kathas
+    drop_table :chapter_kathas
+  end
+end