Update ActiveModel by JSON

[billy1624]

PR Info

• Resolve how to update dynamicly from json value #346

Added

• Set the corresponding attributes in the ActiveModel from a JSON value with ActiveModel::set_from_json method
• New error variant DbErr::Json, representing error of converting JSON value into Model

[billy1624]

But instead of setting columns one by one, why don't we convert a custom deserializable Model into ActiveModel?
https://www.sea-ql.org/SeaORM/docs/advanced-query/custom-active-model

[qyihua]

But instead of setting columns one by one, why don't we convert a custom deserializable Model into ActiveModel? https://www.sea-ql.org/SeaORM/docs/advanced-query/custom-active-model

Hi @billy1624 Thanks for your suggestion. And Sorry for the delay
The Custom Active Model is very helpful for most case of mine.
But in some use case, the keys in json is dynamic at runtime, Custom Active Model can not satisfy.
Do you have any thought of this?

[billy1624]

Hey @qyihua, if you wanna do it dynamically. I guess you need to do it via SeaQuery.

let mut stmt = Query::insert();

stmt.into_table(entity::Entity)
    .columns(cols); // List of columns

for node_json in node_json_batch.into_iter() { // Iterate array of JSON object
    let mut vals = vec![];
    for attribute in attributes.iter() { // Iterate attributes in JSON object
        let val = node_json.get(attribute).unwrap();
        vals.push(val);
    }
    stmt.values_panic(vals);
}

let builder = db.get_database_backend();
let mut stmt = builder.build(&stmt);
db.execute(stmt).await?;

[qyihua]

@billy1624 Thank you

stmt.into_table(entity::Entity)
    .columns(cols); // List of columns

But sea_query need provide special columns in rust code.
So I write a helper trait for my use case:

pub trait SetFromJson
where
    Self: ActiveModelTrait,
{
    fn set_from_json(&mut self, json: &mut JsonValue) -> Result<(), ConvertError>;
}

impl<T> SetFromJson for T
where
    T: ActiveModelTrait,
{
    fn set_from_json(&mut self, json: &mut JsonValue) -> Result<(), ConvertError> {
        for col in <<Self::Entity as EntityTrait>::Column>::iter() {
            if let Some(json_val) = json.get_mut(col.as_str()) {
                self.set_col_from_json(col, json_val.take())
                    .map_err(|err| {
                        ConvertError::Other(format!(
                            "col: `{}`, err: {}",
                            col.as_str(),
                            err.to_string()
                        ))
                    })?;
            }
        }
        Ok(())
    }
}