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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 clear_schema_cache!
ActiveRecord::Base.connection_pool.connections.each do |conn|
conn.schema_cache.clear!
end
end
def reset_column_in_all_models
clear_schema_cache!
# Reset column information for the most offending classes **after** we
# migrated the schema up, otherwise, column information could be outdated
ActiveRecord::Base.descendants.each { |klass| klass.reset_column_information }
# Without that, we get errors because of missing attributes, e.g.
# super: no superclass method `elasticsearch_indexing' for #<ApplicationSetting:0x00007f85628508d8>
ApplicationSetting.define_attribute_methods
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_all_models
end
def schema_migrate_up!
disable_migrations_output do
ActiveRecord::Migrator.migrate(migrations_paths)
end
reset_column_in_all_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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