我有一個結(jié)構(gòu)：Documenttype Document struct { ID entity.EntityID Type string ContentType files.MIMEType URL string UploadedByUserID entity.EntityID CreatedAt time.Time}type MIMEType stringconst ( MIMETypeJPG MIMEType = "image/jpeg" MIMETypePDF MIMEType = "application/pdf" MIMETypePNG MIMEType = "image/png" MIMETypeTXT MIMEType = "text/plain")它映射到一個表，其中列的類型為：documentsContentTypevarchar(1024)create table documents( id bigint not null default nextval('documents_id_seq') PRIMARY KEY, url varchar(1024) not null, type varchar(1024) not null, content_type varchar(1024) not null, uploaded_by_user_id bigint, created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP not null);Create(&d)其中 是一個實例給我一個錯誤：dDocument[2.530ms] [rows:1] INSERT INTO "documents" ("type","content_type","url","uploaded_by_user_id","created_at") VALUES ('other_freight','image/png','https://lateralline-documents-dev.s3.us-west-2.amazonaws.com/doc-other_freight-2021_08_25__11_15_13_379569000.png','253608954016301056','2021-08-25 11:15:13.82') RETURNING "id"interface conversion: interface {} is files.MIMEType, not string我想告訴gorm，當我讀取和寫入字段時，它不僅僅是一個任意字符串，它應該是一個值。有沒有辦法做到這一點？我在其他 ORM 中也看到了此功能。documents.content_typefiles.MIMEType
1 回答
波斯汪
TA貢獻1811條經(jīng)驗 獲得超4個贊
您可能需要查看 中的自定義類型（或檢查此答案）。go-gorm
簡而言之，您需要為結(jié)構(gòu)實現(xiàn) 和 接口。ScannerValuerMIMEType
func (m *MIMEType) Scan(value interface{}) error {
val, ok := value.(string)
if !ok {
return errors.New(fmt.Sprint("Failed to unmarshal string value:", value))
}
*m = MIMEType(val)
return nil
}
func (m MIMEType) Value() (driver.Value, error) {
return string(m), nil
}
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