Error - "cannot infer type for parameter 'rowType'" when using the find function with MongoDB in Ballerina

Question

I'm encountering an error with the Ballerina programming language while querying data from my MongoDB using the find function. The error message I'm getting is: 'cannot infer type for parameter 'rowType'. I have also attached an image of my query method for reference. Can you assist me in resolving this issue?"

This is my code line.

map<json>[] response = check self.mongoClient->find("stores", (), search_query)

Answer 1

Please find the API doc related to the find operation https://lib.ballerina.io/ballerinax/mongodb/4.3.0#Client

Its return type is stream<rowType, error?> | Error

This sample might be useful for you https://github.com/ballerina-platform/module-ballerinax-mongodb/blob/08170e793ac0fb1a642a5a441621968e5134c57d/mongodb/samples/query.bal#L42 (but this is a little bit old)

We can do something like this:

type Store {
    string name;
    string address;
    anydata...;
} 

stream<Store, error?> found = check mongoClient->find("stores", filter = {name: "Joe Market"});

Store is the type of record we are expecting from the collection.