Row to serde_json::Value

[amokio]

for row in rows {
        for col in &cols.metadata.col_specs {
            let value = match col.clone().col_type.id {
                ColType::Varchar | ColType::Ascii => {
                    let val: String = row.get_by_name(col.name.as_str()).unwrap().expect("");
                    println!("{:#?}", val)
                }
                ColType::Map => {
                    let map_value: Map = row.get_by_name(col.name.as_str()).unwrap().expect("");
                }
                _ => {}
            };
        }
    }

is anyone have idea how to convert the Map/List to serde_json::Value? assume the struct is unknown.

[krojew]

You can convert them into Vec/Map and then to Value.

[amokio]

You can convert them into Vec/Map and then to Value.

Not really understanding, any code snippet?

[krojew]

Here's an example how to convert a Cassandra list to a Vec: https://github.com/krojew/cdrs-tokio/blob/master/cdrs-tokio/tests/collection_types.rs#L76
You can do similar thing to a Map.

[amokio]

Here's an example how to convert a Cassandra list to a Vec: https://github.com/krojew/cdrs-tokio/blob/master/cdrs-tokio/tests/collection_types.rs#L76

You can do similar thing to a Map.

But the problem is the row structure is unknown. I need to use ColSpec to get correct type

[krojew]

Is there anything preventing you from calling as_r_rust() on the column data?

[amokio]

Is there anything preventing you from calling as_r_rust() on the column data?

No, but when I declare the new variable like HashMap<String, String (assume I don't know it's String)>, I have to provide type. But assume I don't know the map structure

[krojew]

ColTypeOptionValue contains the information about the underlying types for collections. You can use that to deserialize appropriate values and move them into serde_json::Value.

[amokio]

ColTypeOptionValue contains the information about the underlying types for collections. You can use that to deserialize appropriate values and move them into serde_json::Value.

Yes, currently using this, but not sure how to deal with nested map and triple

[krojew]

The same way you'd do it with other programming languages - recursion.

[amokio]

@krojew , any idea ?

let v: ColTypeOptionValue = col.clone().col_type.value.expect("");
            let v = match v {
                ColTypeOptionValue::CMap(key, v) => {
                    println!("{:#?} {:#?}", key.id, v);

                    // how to use key.id and v.id here?
                    let map: HashMap<?, ?> = row
                        .r_by_name::<Map>(col.name.as_str())
                        .expect("")
                        .as_r_rust()
                        .expect("");
                }
                _ => todo!(),
            };

[krojew]

You are asking a basic programming question now, which is out of scope of rust crates.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.