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Module: Rails::Generators::Migration

Relationships & Source Files
Namespace Children
Modules:
ClassMethods
Extension / Inclusion / Inheritance Descendants
Included In:
ActiveRecord::Generators::Base, ::ActiveRecord::Generators::Migration, ActiveRecord::Generators::MigrationGenerator, ActiveRecord::Generators::ModelGenerator
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::ActiveSupport::Concern
Defined in: railties/lib/rails/generators/migration.rb

Overview

Holds common methods for migrations. It assumes that migrations has the [0-9]*_name format and can be used by another frameworks (like Sequel) just by implementing the next migration version method.

Class Method Summary

::ActiveSupport::Concern - Extended

append_features, class_methods, included

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#migration_class_name (readonly)

[ GitHub ] 

  


# File 'railties/lib/rails/generators/migration.rb', line 11



attr_reader :migration_number, :migration_file_name, :migration_class_name


  








  

    #migration_file_name   (readonly)
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/generators/migration.rb', line 11



attr_reader :migration_number, :migration_file_name, :migration_class_name


  








  

    #migration_number   (readonly)
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/generators/migration.rb', line 11



attr_reader :migration_number, :migration_file_name, :migration_class_name


  







Instance Method Details



  

    #create_migration(destination, data, config = {}, &block)  
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/generators/migration.rb', line 33



def create_migration(destination, data, config = {}, &block)
  action Rails::Generators::Actions::CreateMigration.new(self, destination, block || data.to_s, config)
end


  








  

    #migration_template(source, destination, config = {})  
  



  

    

Creates a migration template at the given destination. The difference to the default template method is that the migration version is appended to the destination file name.



The migration version, migration file name, migration class name are available as instance variables in the template to be rendered.



migration_template "migration.rb", "db/migrate/add_foo_to_bar.rb"


  



  [ GitHub ]


  

  


# File 'railties/lib/rails/generators/migration.rb', line 54



def migration_template(source, destination, config = {})
  source  = File.expand_path(find_in_source_paths(source.to_s))

  set_migration_assigns!(destination)
  context = instance_eval('binding')

  dir, base = File.split(destination)
  numbered_destination = File.join(dir, ["%migration_number%", base].join('_'))

  create_migration numbered_destination, nil, config do
    ERB.new(::File.binread(source), nil, '-', '@output_buffer').result(context)
  end
end


  








  

    #set_migration_assigns!(destination)  
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/generators/migration.rb', line 37



def set_migration_assigns!(destination)
  destination = File.expand_path(destination, self.destination_root)

  migration_dir = File.dirname(destination)
  @migration_number     = self.class.next_migration_number(migration_dir)
  @migration_file_name  = File.basename(destination, '.rb')
  @migration_class_name = @migration_file_name.camelize
end