Class: Zena::Migrator

Inherits:
ActiveRecord::Migrator
  • Object
show all
Defined in:
lib/zena/migrator.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(direction, migrations_path, brick_name, target_version = nil) ⇒ Migrator

Returns a new instance of Migrator.

Raises:

  • (StandardError) 


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# File 'lib/zena/migrator.rb', line 84

def initialize(direction, migrations_path, brick_name, target_version = nil)
  raise StandardError.new("This database does not yet support migrations") unless ActiveRecord::Base.connection.supports_migrations?
  self.class.init_bricks_migration_table
  @direction, @migrations_path, @brick_name, @target_version = direction, migrations_path, brick_name, target_version
end

Class Method Details

.bricks_info_table_name ⇒ Object 



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# File 'lib/zena/migrator.rb', line 25

def bricks_info_table_name
  if ActiveRecord::Base.connection.tables.include?(old_bricks_info_table_name)
    old_bricks_info_table_name
  else
    schema_migrations_table_name
  end
end

.current_version(brick_name) ⇒ Object 



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# File 'lib/zena/migrator.rb', line 37

def current_version(brick_name)
  sm_table = bricks_info_table_name
  if ActiveRecord::Base.connection.table_exists?(sm_table)
    get_all_versions(brick_name).max || 0
  else
    0
  end
end

.down(migrations_path, brick_name, target_version = nil) ⇒ Object 



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# File 'lib/zena/migrator.rb', line 17

def down(migrations_path, brick_name, target_version = nil)
  self.new(:down, migrations_path, brick_name, target_version).migrate
end

.get_all_versions(brick_name) ⇒ Object 



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# File 'lib/zena/migrator.rb', line 33

def get_all_versions(brick_name)
  ActiveRecord::Base.connection.select_values("SELECT version FROM #{bricks_info_table_name} WHERE brick #{brick_name ? '=' : 'IS'} #{ActiveRecord::Base.connection.quote(brick_name)}").map(&:to_i).sort
end

.init_bricks_migration_table ⇒ Object 



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# File 'lib/zena/migrator.rb', line 46

def init_bricks_migration_table

  # Migrate from 0.11 (rails 1.2.3) to 0.13 (rails 2.3.4)
  connection = ActiveRecord::Base.connection
  sm_table = ActiveRecord::Migrator.schema_migrations_table_name
  si_table = ActiveRecord::Base.table_name_prefix + 'schema_info' + ActiveRecord::Base.table_name_suffix
  if !connection.tables.include?(sm_table) && connection.tables.include?(old_bricks_info_table_name)
    v_brick, v_schema = 0, 0
    connection.select_all("SELECT version FROM #{old_bricks_info_table_name} WHERE brick = 'zena'", "Bricks_info fix").each do |record|
      v_brick = record['version'].to_i
    end
    if v_brick > 0
      connection.select_all("SELECT version FROM #{si_table}", "Bricks_info fix").each do |record|
        v_schema = record['version'].to_i
      end
      if v_schema < v_brick
        connection.execute "UPDATE schema_info SET version = #{v_brick}"
        connection.execute "DROP TABLE #{old_bricks_info_table_name}"
        connection.initialize_schema_migrations_table
      end
    end
  end

  if !connection.tables.include?(sm_table)
    connection.initialize_schema_migrations_table
  end

  unless ActiveRecord::Base.connection.columns(schema_migrations_table_name).map{|c| c.name}.include?('brick')
    ActiveRecord::Migration.announce("adding 'brick' scope to schema_migrations")
    ActiveRecord::Migration.add_column   schema_migrations_table_name, :brick, :string
    ActiveRecord::Migration.remove_index schema_migrations_table_name,
                                               :name => 'unique_schema_migrations'
    ActiveRecord::Migration.add_index    schema_migrations_table_name, [:brick,:version],
                                               :name => 'unique_schema_migrations', :unique => true
  end
end

.migrate(migrations_path, brick_name, target_version = nil) ⇒ Object 



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# File 'lib/zena/migrator.rb', line 5

def migrate(migrations_path, brick_name, target_version = nil)
  case
    when target_version.nil?              then up(migrations_path, brick_name, target_version)
    when current_version(brick_name) > target_version then down(migrations_path, brick_name, target_version)
    else                                       up(migrations_path, brick_name, target_version)
  end
end

.old_bricks_info_table_name ⇒ Object 



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# File 'lib/zena/migrator.rb', line 21

def old_bricks_info_table_name
  ActiveRecord::Base.table_name_prefix + "bricks_info" + ActiveRecord::Base.table_name_suffix
end

.up(migrations_path, brick_name, target_version = nil) ⇒ Object 



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# File 'lib/zena/migrator.rb', line 13

def up(migrations_path, brick_name, target_version = nil)
  self.new(:up, migrations_path, brick_name, target_version).migrate
end

Instance Method Details

#migrated ⇒ Object 



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# File 'lib/zena/migrator.rb', line 90

def migrated
  @migrated_versions ||= self.class.get_all_versions(@brick_name)
end