sequelize.col() not recognizing attribute alias

What are you doing?

I map the attribute alias_a to column a in database:

class Test extends Model {}
Test.init({
    alias_a: { type: Sequelize.INTEGER, field: 'a' },
},{
    sequelize,
});

But when querying with sequelize.col, it can not recognize the alias I defined in Model.

Test.findAll({
    attributes: [
        [sequelize.fn('SUM', sequelize.col('alias_a')), 'sum_a'],
    ],
});

I know Test.sum('alias_a') can recognize the alias defined in Model, but sometimes I need to use findAll to get other attributes at the same time.

What do you expect to happen?

{ sum_a: 123 }

What is actually happening?

SequelizeDatabaseError: Unknown column ‘alias_a’ in ‘field list’

What I have tried

I tried to solve this issue by adding a static method col to class Model:

class _Model extends Model {
    static col(attribute) {
        const attrOptions = this.rawAttributes[attribute];
        const field = (attrOptions && attrOptions.field) || attribute;
        return this.sequelize.col(field);
        // above 3 lines are copied from Model.aggregate method
    }
}

Then I can do like:

Test.findAll({
    attributes: [
        [sequelize.fn('SUM', Test.col('alias_a')), 'sum_a'],
    ],
});

which works fine. Just wondering are there any better ways to handle this issue?

Dialect: any Sequelize version: 5.2.13 Tested with latest release: Yes

[leandrocostaoliveira]

I supose the code used to work around the issue should be moved into the Sequelize.col function, making the process transparent. I used some similar approach in the past with Sequelize 4.x, when updated to 5.x, the inner names seems to have changed and my software broke. Anyway, just leaving my +1 to this issue. By now, I will use the approuch in “What I have tried”, thanks @wangzc93

[wangzc93]

@TakanashiOuken See my “What I have tried” section above.