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decimal.go
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/
decimal.go
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package scalars
import (
"fmt"
"github.com/99designs/gqlgen/graphql"
"github.com/shopspring/decimal"
"github.com/weavingwebs/wwgo"
"io"
)
func MarshalDecimalScalar(id *decimal.Decimal) graphql.Marshaler {
return graphql.WriterFunc(func(w io.Writer) {
if id == nil {
_, _ = w.Write([]byte("null"))
return
}
b, _ := id.MarshalText()
_, _ = w.Write([]byte(`"`))
_, _ = w.Write(b)
_, _ = w.Write([]byte(`"`))
})
}
func UnmarshalDecimalScalar(v interface{}) (*decimal.Decimal, error) {
if v == nil {
return nil, nil
}
val, err := func() (decimal.Decimal, error) {
switch v := v.(type) {
case string:
res, err := decimal.NewFromString(v)
if err != nil {
return decimal.Zero, wwgo.NewClientError("GQL_DECIMAL_PARSE_EXCEPTION", err.Error(), err)
}
return res, nil
case int:
return decimal.NewFromInt(int64(v)), nil
case int64:
return decimal.NewFromInt(v), nil
default:
return decimal.Zero, fmt.Errorf("%T is not a string or int", v)
}
}()
return &val, err
}