def import_datasource(
session: Session,
i_datasource: Model,
lookup_database: Callable[[Model], Model],
lookup_datasource: Callable[[Model], Model],
import_time: Optional[int] = None,
) -> int:
"""Imports the datasource from the object to the database.
Metrics and columns and datasource will be overrided if exists.
This function can be used to import/export datasources between multiple
superset instances. Audit metadata isn't copies over.
"""
make_transient(i_datasource)
logger.info("Started import of the datasource: %s", i_datasource.to_json())
i_datasource.id = None
i_datasource.database_id = lookup_database(i_datasource).id
i_datasource.alter_params(import_time=import_time)
# override the datasource
datasource = lookup_datasource(i_datasource)
if datasource:
datasource.override(i_datasource)
session.flush()
else:
datasource = i_datasource.copy()
session.add(datasource)
session.flush()
for metric in i_datasource.metrics:
new_m = metric.copy()
new_m.table_id = datasource.id
logger.info(
"Importing metric %s from the datasource: %s",
new_m.to_json(),
i_datasource.full_name,
)
imported_m = i_datasource.metric_class.import_obj(new_m)
if imported_m.metric_name not in [
m.metric_name for m in datasource.metrics
]:
datasource.metrics.append(imported_m)
for column in i_datasource.columns:
new_c = column.copy()
new_c.table_id = datasource.id
logger.info(
"Importing column %s from the datasource: %s",
new_c.to_json(),
i_datasource.full_name,
)
imported_c = i_datasource.column_class.import_obj(new_c)
if imported_c.column_name not in [
c.column_name for c in datasource.columns
]:
datasource.columns.append(imported_c)
session.flush()
return datasource.id
def import_simple_obj(session: Session, i_obj: Model,
lookup_obj: Callable[[Session, Model], Model]) -> Model:
make_transient(i_obj)
i_obj.id = None
i_obj.table = None
# find if the column was already imported
existing_column = lookup_obj(session, i_obj)
i_obj.table = None
if existing_column:
existing_column.override(i_obj)
session.flush()
return existing_column
session.add(i_obj)
session.flush()
return i_obj