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module MigrationsHelpers
def table(name)
Class.new(ActiveRecord::Base) { self.table_name = name }
end
def migrations_paths
ActiveRecord::Migrator.migrations_paths
end
def table_exists?(name)
ActiveRecord::Base.connection.table_exists?(name)
end
def migrations
ActiveRecord::Migrator.migrations(migrations_paths)
end
def reset_column_in_migration_models
ActiveRecord::Base.clear_cache!
described_class.constants.sort.each do |name|
const = described_class.const_get(name)
if const.is_a?(Class) && const < ActiveRecord::Base
const.reset_column_information
end
end
end
def previous_migration
migrations.each_cons(2) do |previous, migration|
break previous if migration.name == described_class.name
end
end
def migration_schema_version
self.class.metadata[:schema] || previous_migration.version
end
def schema_migrate_down!
disable_migrations_output do
ActiveRecord::Migrator.migrate(migrations_paths,
migration_schema_version)
end
reset_column_in_migration_models
end
def schema_migrate_up!
disable_migrations_output do
ActiveRecord::Migrator.migrate(migrations_paths)
end
reset_column_in_migration_models
end
def disable_migrations_output
ActiveRecord::Migration.verbose = false
yield
ensure
ActiveRecord::Migration.verbose = true
end
def migrate!
ActiveRecord::Migrator.up(migrations_paths) do |migration|
migration.name == described_class.name
end
end
end
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