collectionGroup method
Gets a Query for the specified collection group.
Implementation
Query<Map<String, dynamic>> collectionGroup(String collectionPath) {
assert(
collectionPath.isNotEmpty,
'a collection path must be a non-empty string',
);
assert(
!collectionPath.contains('/'),
'a collection path passed to collectionGroup() cannot contain "/"',
);
return _JsonQuery(this, _delegate.collectionGroup(collectionPath));
}