Sqlalchemy Filter Nested Jsonb Within Arrays

I have a Postgres JSONB field, with some nested arrays and other objects. from sqlalchemy.dialects.postgresql import JSONB class Family(db.Model): meta = db.Column(JSONB) jo

Solution 1:

The trick is to unnest the array or arrays using jsonb_array_elements(), and then filter:

meta_value = literal_column('meta.value', type_=JSONB)
children_value = literal_column('children.value', type_=JSONB)

Family.query.\
    with_entities(children_value['name'].astext).\
    select_from(
        Family,
        func.jsonb_array_elements(Family.meta).alias('meta'),
        func.jsonb_array_elements(
            meta_value['children']).alias('children')).\
    filter(children_value['name'].astext.contains('a'))

Note the use of literal_column() to reference the values of the set returning function jsonb_array_elements().

Another option is to use jsonb_path_query() (introduced in version 12):

name =column('name', type_=JSONB)
Family.query.\
    with_entities(name.astext).\
    select_from(
        func.jsonb_path_query(
            Family.meta,
            '$[*].children[*].name').alias('name')).\
    filter(name.astext.contains('a')).\
    all()