是否可以将多个 Select 子句与 gorm 链接起来？

Question

I know I can chain several Where clauses using gorm, but can I do the same with several Select clauses?

I've tried something like this with no luck:

query.Select("field1, field2").Select("field3").Find(&models)

The fact is that I need to chain different select clauses depending on certain conditions. How to achieve this?

Answer 1

Chaining multiple Select() calls won't work, as it will only apply the last one. So in your example, the query will look like:

SELECT "field3" FROM "model";

Select() also accepts a []string , so instead, make a slice of strings representing the fields that you need to SELECT , and append to it other columns under certain conditions:

selects := []string{"field1", "field2"}

if condition {
    selects = append(selects, "field3")
}

query.Select(selects).Find(&models)