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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| package nulls | ||
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||
| import ( | ||
| "database/sql/driver" | ||
| "encoding/json" | ||
|
|
||
| "github.com/satori/go.uuid" | ||
| ) | ||
|
|
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| // UUID can be used with the standard sql package to represent a | ||
| // UUID value that can be NULL in the database | ||
| type UUID struct { | ||
| UUID uuid.UUID | ||
| Valid bool | ||
| } | ||
|
|
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| func (ns UUID) Interface() interface{} { | ||
| if !ns.Valid { | ||
| return nil | ||
| } | ||
| return ns.UUID | ||
| } | ||
|
|
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| // NewString returns a new, properly instantiated | ||
| // String object. | ||
| func NewUUID(u uuid.UUID) UUID { | ||
| return UUID{UUID: u, Valid: true} | ||
| } | ||
|
|
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| // Value implements the driver.Valuer interface. | ||
| func (u UUID) Value() (driver.Value, error) { | ||
| if !u.Valid { | ||
| return nil, nil | ||
| } | ||
| // Delegate to UUID Value function | ||
| return u.UUID.Value() | ||
| } | ||
|
|
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| // Scan implements the sql.Scanner interface. | ||
| func (u *UUID) Scan(src interface{}) error { | ||
| if src == nil { | ||
| u.UUID, u.Valid = uuid.Nil, false | ||
| return nil | ||
| } | ||
|
|
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| // Delegate to UUID Scan function | ||
| u.Valid = true | ||
| return u.UUID.Scan(src) | ||
| } | ||
|
|
||
| // MarshalJSON marshals the underlying value to a | ||
| // proper JSON representation. | ||
| func (ns UUID) MarshalJSON() ([]byte, error) { | ||
| if ns.Valid { | ||
| return json.Marshal(ns.UUID.String()) | ||
| } | ||
| return json.Marshal(nil) | ||
| } | ||
|
|
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| // UnmarshalJSON will unmarshal a JSON value into | ||
| // the propert representation of that value. | ||
| func (ns *UUID) UnmarshalJSON(text []byte) error { | ||
| ns.Valid = false | ||
| ns.UUID = uuid.Nil | ||
| if string(text) == "null" { | ||
| return nil | ||
| } | ||
|
|
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| s := "" | ||
| if err := json.Unmarshal(text, &s); err == nil { | ||
| if u, err := uuid.FromString(s); err == nil { | ||
| ns.UUID = u | ||
| ns.Valid = true | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (ns *UUID) UnmarshalText(text []byte) error { | ||
| return ns.UnmarshalJSON(text) | ||
| } |