Function json_object_contains_key 

pub fn json_object_contains_key<'a, L>(
    left: L,
    path: &'a str,
    key: &'a str,
) -> SQL<'a, SQLiteValue<'a>>
where
    L: ToSQL<'a, SQLiteValue<'a>>,

Builds a test that is true when the JSON object at path has the key key.

The key is appended to the path ("$" and "" mean the root object), and the result is checked with json_type(..) IS NOT NULL. key is not quoted, so it must be a plain key name.

Examples

let column = SQL::<SQLiteValue>::raw("metadata");
let condition = json_object_contains_key(column, "$", "theme");
assert_eq!(condition.sql(), "json_type( metadata , ? ) IS NOT NULL");