How to Persist a Custom Go Set Data Type in MySQL using GORM?

Persisting Custom Set Data Type using GORM Go

Problem:

You have a custom Set data type defined in Go, such as threadUnsafeSet, and you're attempting to persist this data type into MySQL using the GORM library. However, you encounter an error related to the invalid SQL type for the set.

Solution:

To resolve this issue, you need to implement the Value and Scan methods for your custom set data type. These methods enable the database driver to store and retrieve the data in a database-compatible format.

Here's an example implementation:

type ThreadUnsafeSet map[interface{}]struct{}

func (data *ThreadUnsafeSet) Value() (driver.Value, error) {
    // Implement the logic to convert data to a database-compatible format, e.g., JSON
    return data.ConvertJSONToString(), nil
}

func (data *ThreadUnsafeSet) Scan(value interface{}) error {
    // Implement the logic to convert from the database-compatible format to the custom set data type
    *data = data.ConvertStringToJson(valueString)
    return nil
}

Additional Note:

In the Value and Scan methods, you can use some serialization or encoding techniques like JSON to convert your custom data type into a string or byte format compatible with MySQL. This allows you to store and retrieve the data as a single entity rather than separate columns.

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