How to Map Query Results to a Struct Using Gorm: Handling Default Values and Empty Arrays?

Retrieving Query Results into a Struct Using gorm

When attempting to scan the results of a query into a struct, it's crucial to adhere to gorm's naming conventions to ensure proper field mapping. If the query results in default values or an empty array, consider the following options:

Public Struct Fields:

Ensure that the res struct has public fields. The struct definition should look like the following:

type res struct {
    ID   int
    Number int
    UserID int
}

Column Mapping:

Alternatively, explicitly specify the mapping between query columns and struct fields using gorm tags:

type res struct {
    id int      `gorm:"column:id"`
    number int  `gorm:"column:number"`
    user_id int `gorm:"column:user_id"`
}

By following either of these approaches, gorm can correctly map the query results to the fields in the res struct, allowing you to access the results as expected.

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