Adding hashtags

db/migrate/20161105130633_create_statuses_tags_join_table.rb

@@ -0,0 +1,8 @@
+class CreateStatusesTagsJoinTable < ActiveRecord::Migration[5.0]
+  def change
+    create_join_table :statuses, :tags do |t|
+      t.index :tag_id
+      t.index [:tag_id, :status_id], unique: true
+    end
+  end
+end