Class: Card::Migration

Inherits:
ActiveRecord::Migration
  • Object
show all
Defined in:
lib/card/migration.rb

Direct Known Subclasses

CoreMigration

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.assume_migrated_upto_version ⇒ Object 



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# File 'lib/card/migration.rb', line 49

def assume_migrated_upto_version
  schema_mode do
    ActiveRecord::Schema.assume_migrated_upto_version schema, migration_paths
  end
end

.data_path(filename = nil) ⇒ Object 



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# File 'lib/card/migration.rb', line 55

def data_path filename=nil
  path = migration_paths.first
  File.join( [ migration_paths.first, 'data', filename ].compact )
end

.find_unused_name(base_name) ⇒ Object 



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# File 'lib/card/migration.rb', line 18

def find_unused_name base_name
  test_name = base_name
  add = 1
  while Card.exists?(test_name) do
    test_name = "#{base_name}#{add}"
    add +=1
  end
  test_name
end

.migration_paths(mig_type = type) ⇒ Object 



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# File 'lib/card/migration.rb', line 28

def migration_paths mig_type=type
  Cardio.migration_paths mig_type
end

.schema(mig_type = type) ⇒ Object 



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# File 'lib/card/migration.rb', line 32

def schema mig_type=type
  Cardio.schema mig_type
end

.schema_mode(mig_type = type) ⇒ Object 



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# File 'lib/card/migration.rb', line 40

def schema_mode mig_type=type
  new_suffix = schema_suffix mig_type
  original_suffix = ActiveRecord::Base.table_name_suffix

  ActiveRecord::Base.table_name_suffix = new_suffix
  yield
  ActiveRecord::Base.table_name_suffix = original_suffix
end

.schema_suffix(mig_type = type) ⇒ Object 



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# File 'lib/card/migration.rb', line 36

def schema_suffix mig_type=type
  Cardio.schema_suffix mig_type
end

.type ⇒ Object

Rake tasks use class methods, migrations use instance methods. To avoid repetition a lot of instance methods here just call class methods. The subclass Card::CoreMigration needs a different @type so we can’t use a class variable @@type. It has to be a class instance variable. Migrations are subclasses of Card::Migration or Card::CoreMigration but they don’t inherit the @type. The method below solves this problem.



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# File 'lib/card/migration.rb', line 14

def type
  @type || (ancestors[1] && ancestors[1].type)
end

Instance Method Details

#contentedly(&block) ⇒ Object 



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# File 'lib/card/migration.rb', line 62

def contentedly &block
  Card::Cache.reset_global
  Cardio.schema_mode '' do
    Card::Auth.as_bot do
      ActiveRecord::Base.transaction do
        begin
          yield
        ensure
          Card::Cache.reset_global
        end
      end
    end
  end
end

#data_path(filename = nil) ⇒ Object 



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# File 'lib/card/migration.rb', line 89

def data_path filename=nil
  self.class.data_path filename
end

#down ⇒ Object

Raises:

  • (ActiveRecord::IrreversibleMigration) 


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# File 'lib/card/migration.rb', line 145

def down
  raise ActiveRecord::IrreversibleMigration
end

#import_json(filename, merge_opts = {}) ⇒ Object 



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# File 'lib/card/migration.rb', line 77

def import_json filename, merge_opts={}
  Card.config.action_mailer.perform_deliveries = false
  merge_opts.reverse_merge! :output_file=>File.join(data_path,"unmerged_#{ filename }")
  Card.merge_list read_json(filename), merge_opts
end

#migrate(direction) ⇒ Object

Execute this migration in the named direction copied from ActiveRecord to wrap “up” in “contentendly”



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# File 'lib/card/migration.rb', line 104

def migrate(direction)
  return unless respond_to?(direction)

  case direction
  when :up   then announce "migrating"
  when :down then announce "reverting"
  end

  time   = nil
  ActiveRecord::Base.connection_pool.with_connection do |conn|
    @connection = conn
    if respond_to?(:change)
      if direction == :down
        recorder = CommandRecorder.new(@connection)
        suppress_messages do
          @connection = recorder
          change
        end
        @connection = conn
        time = Benchmark.measure {
          self.revert {
            recorder.inverse.each do |cmd, args|
              send(cmd, *args)
            end
          }
        }
      else
        time = Benchmark.measure { change }
      end
    else
      time = Benchmark.measure { contentedly { send(direction) } }
    end
    @connection = nil
  end

  case direction
  when :up   then announce "migrated (%.4fs)" % time.real; write
  when :down then announce "reverted (%.4fs)" % time.real; write
  end
end

#migration_paths ⇒ Object 



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# File 'lib/card/migration.rb', line 97

def migration_paths
  Cardio.paths self.class.type
end

#read_json(filename) ⇒ Object 



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# File 'lib/card/migration.rb', line 83

def read_json filename
  raw_json = File.read( data_path filename )
  json = JSON.parse raw_json
  json["card"]["value"]
end

#schema_mode ⇒ Object 



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# File 'lib/card/migration.rb', line 93

def schema_mode
  Cardio.schema_mode self.class.type
end