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Class: ActiveRecord::Migration::Compatibility::V4_2

Do not use. This class is for internal use only.

Constant Summary

::ActiveRecord::Migration - Inherited

MigrationFilenameRegexp

Class Attribute Summary

::ActiveRecord::Migration - Inherited

.verbose

Specifies if migrations will write the actions they are taking to the console as they happen, along with benchmarks describing how long each step took.
.any_schema_needs_update?, .delegate, .disable_ddl_transaction

Class Method Summary

::ActiveRecord::Migration - Inherited

.[],
.check_all_pending!

Raises ::ActiveRecord::PendingMigrationError error if any migrations are pending for all database configurations in an environment.
.current_version,
.disable_ddl_transaction!

Disable the transaction wrapping this migration.
.load_schema_if_pending!, .migrate, .new, .db_configs_in_current_env, .env, .load_schema!, .pending_migrations, .check_pending_migrations, .inherited, .maintain_test_schema!, .method_missing, .nearest_delegate, .valid_version_format?

Instance Attribute Summary

::ActiveRecord::Migration - Inherited

#name, #reverting?,
#verbose

Alias for class attribute ActiveRecord::Migration.verbose
#version

Instance Method Summary

V5_0 - Inherited

#add_belongs_to

Alias for V5_0#add_reference.
#add_column, #add_reference, #create_join_table, #create_table, #compatible_table_definition

V5_1 - Inherited

#change_column, #create_table

V5_2 - Inherited

#add_timestamps, #command_recorder, #compatible_table_definition

V6_0 - Inherited

#add_belongs_to

Alias for V6_0#add_reference.
#add_reference, #compatible_table_definition

V6_1 - Inherited

#add_column, #change_column, #compatible_table_definition

V7_0 - Inherited

#add_belongs_to

Alias for V7_0#add_reference.
#add_column, #add_foreign_key, #add_index, #add_reference, #change_column, #change_column_null, #create_table, #disable_extension, #rename_table, #compatible_table_definition

V7_0::LegacyIndexName - Included

#expression_column_name?, #index_name_options, #legacy_index_name

::ActiveRecord::Migration::Current - Inherited

#change_table, #compatible_table_definition, #create_join_table, #create_table, #drop_table

::ActiveRecord::Migration - Inherited

#announce, #connection, #connection_pool, #copy, #down, #exec_migration, #execution_strategy, #method_missing,
#migrate

Execute this migration in the named direction.
#next_migration_number

Determines the version number of the next migration.
#proper_table_name

Finds the correct table name given an Active Record object.
#reversible

Used to specify an operation that can be run in one direction or another.
#revert

Reverses the migration commands for the given block and the given migrations.
#run

Runs the given migration classes.
#say

Takes a message argument and outputs it as is.
#say_with_time

Outputs text along with how long it took to run its block.
#suppress_messages

Takes a block as an argument and suppresses any output generated by the block.
#up,
#up_only

Used to specify an operation that is only run when migrating up (for example, populating a new column with its initial values).
#write, #command_recorder, #execute_block, #format_arguments, #internal_option?, #disable_ddl_transaction,
#table_name_options

Builds a hash for use in ActiveRecord::Migration#proper_table_name using the Active Record object’s table_name prefix and suffix.

Constructor Details

This class inherits a constructor from ActiveRecord::Migration

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ActiveRecord::Migration

Instance Method Details

#add_belongs_to(table_name, ref_name, **options)

Alias for #add_reference.

[ GitHub ] 

  


# File 'activerecord/lib/active_record/migration/compatibility.rb', line 438



alias :add_belongs_to :add_reference


  








  

    #add_reference(table_name, ref_name, **options)  
    Also known as: #add_belongs_to
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/migration/compatibility.rb', line 434



def add_reference(table_name, ref_name, **options)
  options[:index] ||= false
  super
end


  








  

    #add_timestamps(table_name, **options)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/migration/compatibility.rb', line 440



def add_timestamps(table_name, **options)
  options[:null] = true if options[:null].nil?
  super
end


  








  

    #compatible_table_definition(t)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/migration/compatibility.rb', line 462



def compatible_table_definition(t)
  class << t
    prepend TableDefinition
  end
  super
end


  








  

    #index_exists?(table_name, column_name, **options)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/migration/compatibility.rb', line 445



def index_exists?(table_name, column_name, **options)
  column_names = Array(column_name).map(&:to_s)
  options[:name] =
    if options[:name].present?
      options[:name].to_s
    else
      connection.index_name(table_name, column: column_names)
    end
  super
end


  








  

    #index_name_for_remove(table_name, column_name, options)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/migration/compatibility.rb', line 469



def index_name_for_remove(table_name, column_name, options)
  index_name = connection.index_name(table_name, column_name || options)

  unless connection.index_name_exists?(table_name, index_name)
    if options.key?(:name)
      options_without_column = options.except(:column)
      index_name_without_column = connection.index_name(table_name, options_without_column)

      if connection.index_name_exists?(table_name, index_name_without_column)
        return index_name_without_column
      end
    end

    raise ArgumentError, "Index name '#{index_name}' on table '#{table_name}' does not exist"
  end

  index_name
end


  








  

    #remove_index(table_name, column_name = nil, **options)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/migration/compatibility.rb', line 456



def remove_index(table_name, column_name = nil, **options)
  options[:name] = index_name_for_remove(table_name, column_name, options)
  super
end