Module: StrongMigrations::SafeMethods

Included in:
Checker
Defined in:
lib/strong_migrations/safe_methods.rb

Instance Method Summary collapse

Instance Method Details

#disable_transaction ⇒ Object

hard to commit at right time when reverting so just commit at start



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# File 'lib/strong_migrations/safe_methods.rb', line 137

def disable_transaction
  if in_transaction? && !transaction_disabled
    connection.commit_db_transaction
    self.transaction_disabled = true
  end
end

#in_transaction? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strong_migrations/safe_methods.rb', line 144

def in_transaction?
  connection.open_transactions > 0
end

#safe_add_check_constraint(table, expression, *args, add_options, validate_options) ⇒ Object 



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# File 'lib/strong_migrations/safe_methods.rb', line 61

def safe_add_check_constraint(table, expression, *args, add_options, validate_options)
  @migration.reversible do |dir|
    dir.up do
      # only skip invalid constraints
      unless connection.check_constraints(table).any? { |c| c.options[:name] == validate_options[:name] && !c.options[:validate] }
        @migration.add_check_constraint(table, expression, *args, **add_options)
      end
      disable_transaction
      @migration.validate_check_constraint(table, **validate_options)
    end
    dir.down do
      @migration.remove_check_constraint(table, expression, **add_options.except(:validate))
    end
  end
end

#safe_add_foreign_key(from_table, to_table, *args, **options) ⇒ Object 



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# File 'lib/strong_migrations/safe_methods.rb', line 46

def safe_add_foreign_key(from_table, to_table, *args, **options)
  @migration.reversible do |dir|
    dir.up do
      if !connection.foreign_key_exists?(from_table, to_table, **options.merge(validate: false))
        @migration.add_foreign_key(from_table, to_table, *args, **options.merge(validate: false))
      end
      disable_transaction
      @migration.validate_foreign_key(from_table, to_table, **options.slice(:column, :name))
    end
    dir.down do
      @migration.remove_foreign_key(from_table, to_table, **options.slice(:column, :name))
    end
  end
end

#safe_add_index(*args, **options) ⇒ Object 



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# File 'lib/strong_migrations/safe_methods.rb', line 7

def safe_add_index(*args, **options)
  disable_transaction
  @migration.add_index(*args, **options.merge(algorithm: :concurrently))
end

#safe_add_reference(table, reference, *args, **options) ⇒ Object 



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# File 'lib/strong_migrations/safe_methods.rb', line 17

def safe_add_reference(table, reference, *args, **options)
  @migration.reversible do |dir|
    dir.up do
      disable_transaction
      foreign_key = options.delete(:foreign_key)
      @migration.add_reference(table, reference, *args, **options)
      if foreign_key
        # same as Active Record
        name =
          if foreign_key.is_a?(Hash) && foreign_key[:to_table]
            foreign_key[:to_table]
          else
            (ActiveRecord::Base.pluralize_table_names ? reference.to_s.pluralize : reference).to_sym
          end

        foreign_key_opts = foreign_key.is_a?(Hash) ? foreign_key.except(:to_table) : {}
        if reference
          @migration.add_foreign_key(table, name, column: "#{reference}_id", **foreign_key_opts)
        else
          @migration.add_foreign_key(table, name, **foreign_key_opts)
        end
      end
    end
    dir.down do
      @migration.remove_reference(table, reference)
    end
  end
end

#safe_by_default_method?(method) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/strong_migrations/safe_methods.rb', line 3

def safe_by_default_method?(method)
  StrongMigrations.safe_by_default && !version_safe? && [:add_index, :add_belongs_to, :add_reference, :remove_index, :add_foreign_key, :add_check_constraint, :change_column_null].include?(method)
end

#safe_change_column_null(add_args, validate_args, change_args, remove_args, table, column, default, constraints) ⇒ Object 



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# File 'lib/strong_migrations/safe_methods.rb', line 77

def safe_change_column_null(add_args, validate_args, change_args, remove_args, table, column, default, constraints)
  @migration.reversible do |dir|
    dir.up do
      unless default.nil?
        # TODO search for parent model if needed
        if connection.pool != ActiveRecord::Base.connection_pool
          raise_error :change_column_null,
            code: backfill_code(table, column, default)
        end

        model =
          Class.new(ActiveRecord::Base) do
            self.table_name = table

            def self.to_s
              "Backfill"
            end
          end

        update_sql =
          model.connection_pool.with_connection do |c|
            quoted_column = c.quote_column_name(column)
            quoted_default = c.quote_default_expression(default, c.send(:column_for, table, column))
            "#{quoted_column} = #{quoted_default}"
          end

        @migration.say("Backfilling default")
        disable_transaction
        model.unscoped.in_batches(of: 10000) do |relation|
          relation.where(column => nil).update_all(update_sql)
          sleep(0.01)
        end
      end

      add_options = add_args.extract_options!
      validate_options = validate_args.extract_options!
      remove_options = remove_args.extract_options!

      # only skip invalid constraints
      unless constraints.any? { |c| c.options[:name] == validate_options[:name] && !c.options[:validate] }
        @migration.add_check_constraint(*add_args, **add_options)
      end
      disable_transaction

      connection.begin_db_transaction
      @migration.validate_check_constraint(*validate_args, **validate_options)
      @migration.change_column_null(*change_args)
      @migration.remove_check_constraint(*remove_args, **remove_options)
      connection.commit_db_transaction
    end
    dir.down do
      down_args = change_args.dup
      down_args[2] = true
      @migration.change_column_null(*down_args)
    end
  end
end

#safe_remove_index(*args, **options) ⇒ Object 



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# File 'lib/strong_migrations/safe_methods.rb', line 12

def safe_remove_index(*args, **options)
  disable_transaction
  @migration.remove_index(*args, **options.merge(algorithm: :concurrently))
end