forgeplus/db/migrate/20200106022157_create_project_trends.rb

class CreateProjectTrends < ActiveRecord::Migration[5.2]
  def change
    create_table :project_trends do |t|
      t.integer :user_id
      t.integer :project_id
      t.references :trend, polymorphic: true, index: true
      t.string :action_type
      t.timestamps
    end
    add_index :project_trends, [:user_id, :project_id]
  end
end