I'm having some difficulty using SQLAlchemy's jsonb operators to produce my
desired SQL.
Intended SQL:
SELECT *
FROM foo
WHERE foo.data->'key1' ? 'a'
...where `foo.data` is formatted like this:
{
'key1': ['a', 'b', 'c'],
'key2': ['d', 'e', 'f']
}
So, I'm trying to find records where the array associated with `key1`
contains some value, 'a' in this case.
I thought it'd be a straightforward query, like:
sess.query(Foo).filter(Foo.data['key1'].has_key('a')).all()
But this is yielding:
AttributeError: Neither 'JSONElement' object nor 'Comparator' object
has an attribute 'has_key'
So I changed the query to:
sess.query(Foo).filter(Foo.data['key1'].cast(JSONB).has_key('a')).all()
But this query produces the following SQL statement:
SELECT *
FROM foo
WHERE (foo.data->>'key1')::JSONB ? 'a'
Here, the `->>` operator is casting the jsonb value associated with key
`key1` to text, which I then have to cast back to jsonb in order to use the
`?` operator (jsonb-specific) to check if a string is contained in the
first value.
Any ideas?
Thanks.
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