Module: Calib::SoftDeletion::MigrationEnhancable

Included in:
Devise::SoftDeletionMigrationEnhancable
Defined in:
lib/calib/soft_deletion/migration_enhancable.rb

Overview

A Module for soft deletation on MySQL and PostgreSQL.

with unique constraints(‘deleted_at = nil` couldn’t do it).

usage

create migration file

# Inlude this Modlule and edit.
class AddNameToUsers < ActiveRecord::Migration[5.1]
  include Calib::SoftDeletion::MigrationEnhancable
  def change
    add_unique_column_for_soft_deletion :users, :name      
  end
end

and migrate

Instance Method Summary collapse

Instance Method Details

#add_column_for_soft_deletion(table, filter_column = :alive) ⇒ Object

add column for soft deletation as filter_column



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# File 'lib/calib/soft_deletion/migration_enhancable.rb', line 24

def add_column_for_soft_deletion(table, filter_column = :alive)
  # @see https://qiita.com/yuba/items/70165875cfe02b03513d
  add_column table, filter_column, :integer, default: 1 # if canceled, alive=NULL for MYSQL
end

#add_unique_column_for_soft_deletion(table, unique_column, filter_column = :alive) ⇒ Object

add unique column with soft deletation column as filter_column



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# File 'lib/calib/soft_deletion/migration_enhancable.rb', line 18

def add_unique_column_for_soft_deletion(table, unique_column, filter_column = :alive)
  add_column_for_soft_deletion(table, filter_column)
  add_unique_index_for_soft_deletion(table, unique_column, filter_column)
end

#add_unique_index_for_soft_deletion(table, unique_column, filter_column = :alive) ⇒ Object

add unique index with soft deletation column as filter_column



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# File 'lib/calib/soft_deletion/migration_enhancable.rb', line 30

def add_unique_index_for_soft_deletion(table, unique_column, filter_column = :alive)
  if connection.adapter_name == 'MySQL'
    add_index table, [unique_column, filter_column], unique: true
  else
    # @see http://rny.io/rails/postgresql/2013/08/20/postgresql-indexing-in-rails.html
    add_index table, [unique_column, filter_column], unique: true, where: "#{filter_column} = 1" # for Postgresql indexes partial
  end
end