How to Correctly Scan Nested Structs into Go Structs Using SQLX?

SQLX Nested Struct Scanning

When attempting to scan query results into nested structs using SQLX, it's crucial to understand the correct approach.

In the example provided, a type mismatch error occurs because the Address struct is not correctly embedded within the Customer struct. To address this issue, embedding is required.

Embedded Structs

Embedded structs allow for access to the embedded fields without the need for prefixing them with the embedded type's name. This simplifies field access and ensures that fields from the embedded struct are populated correctly when scanning query results.

type Customer struct {
    Id        int
    Name      string
    Address   // Embedded struct without tags
}

type Address struct {
    Street string  `db:"street"`
    City   string  `db:"city"`
}

Updated Query

By embedding the Address struct, SQLX will automatically assign values from the query result to the appropriate fields based on their database tags.

customer := models.Customer{}
err := db.Get(&customer, `select * from users where>

JSON Marshalling

Note that embedding the Address struct will flatten the JSON output, removing the nested address object. To maintain the nested structure, consider using a type conversion to map the fields back to the original struct.

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