created models for chatroom

db/migrate/20180829122818_create_chat_rooms.rb

@@ -0,0 +1,8 @@
+class CreateChatRooms < ActiveRecord::Migration[5.2]
+  def change
+    create_table :chat_rooms do |t|
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20180829122930_create_chat_room_participations.rb

@@ -0,0 +1,10 @@
+class CreateChatRoomParticipations < ActiveRecord::Migration[5.2]
+  def change
+    create_table :chat_room_participations do |t|
+      t.references :user, foreign_key: true
+      t.references :chat_room, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20180829123049_create_requests.rb

@@ -0,0 +1,11 @@
+class CreateRequests < ActiveRecord::Migration[5.2]
+  def change
+    create_table :requests do |t|
+      t.references :user, foreign_key: true
+      t.references :chat_room, foreign_key: true
+      t.boolean :accepted
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20180829123204_change_column_in_requests.rb

@@ -0,0 +1,5 @@
+class ChangeColumnInRequests < ActiveRecord::Migration[5.2]
+  def change
+    change_column :requests, :accepted, :boolean, default: false
+  end
+end