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68 lines
1.4 KiB
68 lines
1.4 KiB
// For furture references related to this:
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// https://coussej.github.io/2016/02/16/Handling-JSONB-in-Go-Structs/
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// https://github.com/jinzhu/gorm/issues/1155
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package datamodels
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import (
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"database/sql/driver"
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"encoding/json"
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"errors"
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)
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// JSONdb type
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//
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// This type is meant to be used when the double interaction between GORM and
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// JSON (un)marshalling is needed
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type JSONdb map[string]interface{}
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// Value method for the interface.
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//
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// To satisfy this interface, we must implement the Value method, which
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// must transform our type to a database driver compatible type.
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// In our case, we’ll marshall the map to JSONB data (= []byte):
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func (j JSONdb) Value() (driver.Value, error) {
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m, e := json.Marshal(j)
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return m, e
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}
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// Scan method for the interface.
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//
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// This method must take the raw data that comes from the database
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// and transform it to our new type. In our case, the database will
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// return JSONB ([]byte) that we must transform to our type
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// (the reverse of what we did with driver.Valuer):
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func (p *JSONdb) Scan(src interface{}) error {
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source, ok := src.([]byte)
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if !ok {
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return errors.New("type assertion .([]byte) failed")
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}
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var i interface{}
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e := json.Unmarshal(source, &i)
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if e != nil {
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return e
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}
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*p, ok = i.(map[string]interface{})
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if !ok {
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return errors.New("type assertion .(map[string]interface{}) failed")
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}
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return nil
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}
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