Class: Sequel::SimpleMigration

Inherits:
Object
  • Object
show all
Defined in:
lib/sequel/extensions/migration.rb

Overview

Migration class used by the Sequel.migration DSL, using instances for each migration, unlike the Migration class, which uses subclasses for each migration. Part of the migration extension.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initializeSimpleMigration

Don't set transaction use by default.



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# File 'lib/sequel/extensions/migration.rb', line 97

def initialize
  @use_transactions = nil
end

Instance Attribute Details

#downObject

Proc used for the down action



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# File 'lib/sequel/extensions/migration.rb', line 87

def down
  @down
end

#upObject

Proc used for the up action



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# File 'lib/sequel/extensions/migration.rb', line 90

def up
  @up
end

#use_transactionsObject

Whether to use transactions for this migration, default depends on the database.



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# File 'lib/sequel/extensions/migration.rb', line 94

def use_transactions
  @use_transactions
end

Instance Method Details

#apply(db, direction) ⇒ Object

Apply the appropriate block on the Database instance using instance_eval.

Raises:

  • (ArgumentError)


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# File 'lib/sequel/extensions/migration.rb', line 103

def apply(db, direction)
  raise(ArgumentError, "Invalid migration direction specified (#{direction.inspect})") unless [:up, :down].include?(direction)
  if prok = send(direction)
    db.instance_eval(&prok)
  end
end