whereMatchesKeyInQuery method
Add a constraint to the query that requires a particular key's value matches a value for a key in the results of another ParseQuery.
Implementation
void whereMatchesKeyInQuery(String key, String keyInQuery, ParseQuery query) {
Map<String, dynamic> condition = Map();
condition.putIfAbsent("key", () => keyInQuery);
condition.putIfAbsent("query", () => query);
_addCondition(key, "\$select", condition);
}