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Support for readonly transient field #394 #398

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Support for readonly transient field #394 #398

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10 changes: 7 additions & 3 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -261,13 +261,17 @@ type Person struct {
// table.ColMap("Id").Rename("product_id")
// table.ColMap("Price").Rename("unit_price")
// table.ColMap("IgnoreMe").SetTransient(true)
// table.ColMap("IgnoreWrite").Rename("ignore_write").SetTransient(true)
//
// You can optionally declare the field to be a primary key and/or autoincrement
// The readonly fields are transient but available for mapping on reads (e.g. this
// field may be a computed property)
//
type Product struct {
Id int64 `db:"product_id, primarykey, autoincrement"`
Price int64 `db:"unit_price"`
IgnoreMe string `db:"-"`
Id int64 `db:"product_id, primarykey, autoincrement"`
Price int64 `db:"unit_price"`
IgnoreMe string `db:"-"`
IgnoreWrite string `db:"ignore_write, readonly"`
}
```

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5 changes: 4 additions & 1 deletion db.go
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Expand Up @@ -320,6 +320,7 @@ func (m *DbMap) readStructColumns(t reflect.Type) (cols []*ColumnMap, primaryKey
var isAuto bool
var isPK bool
var isNotNull bool
var isReadOnly bool
for _, argString := range cArguments[1:] {
argString = strings.TrimSpace(argString)
arg := strings.SplitN(argString, ":", 2)
Expand Down Expand Up @@ -349,6 +350,8 @@ func (m *DbMap) readStructColumns(t reflect.Type) (cols []*ColumnMap, primaryKey
isAuto = true
case "notnull":
isNotNull = true
case "readonly":
isReadOnly = true
default:
panic(fmt.Sprintf("Unrecognized tag option for field %v: %v", f.Name, arg))
}
Expand Down Expand Up @@ -390,7 +393,7 @@ func (m *DbMap) readStructColumns(t reflect.Type) (cols []*ColumnMap, primaryKey
cm := &ColumnMap{
ColumnName: columnName,
DefaultValue: defaultValue,
Transient: columnName == "-",
Transient: columnName == "-" || isReadOnly,
fieldName: f.Name,
gotype: gotype,
isPK: isPK,
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