fix: improve scan error message

schema/scan.go

@@ -149,8 +149,9 @@ func scanBool(dest reflect.Value, src interface{}) error {
 		}
 		dest.SetBool(f)
 		return nil
+	default:
+		return scanError(dest.Type(), src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
 }
 
 func scanInt64(dest reflect.Value, src interface{}) error {
@@ -178,8 +179,9 @@ func scanInt64(dest reflect.Value, src interface{}) error {
 		}
 		dest.SetInt(n)
 		return nil
+	default:
+		return scanError(dest.Type(), src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
 }
 
 func scanUint64(dest reflect.Value, src interface{}) error {
@@ -207,8 +209,9 @@ func scanUint64(dest reflect.Value, src interface{}) error {
 		}
 		dest.SetUint(n)
 		return nil
+	default:
+		return scanError(dest.Type(), src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
 }
 
 func scanFloat64(dest reflect.Value, src interface{}) error {
@@ -233,8 +236,9 @@ func scanFloat64(dest reflect.Value, src interface{}) error {
 		}
 		dest.SetFloat(f)
 		return nil
+	default:
+		return scanError(dest.Type(), src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
 }
 
 func scanString(dest reflect.Value, src interface{}) error {
@@ -251,8 +255,18 @@ func scanString(dest reflect.Value, src interface{}) error {
 	case time.Time:
 		dest.SetString(src.Format(time.RFC3339Nano))
 		return nil
+	case int64:
+		dest.SetString(strconv.FormatInt(src, 10))
+		return nil
+	case uint64:
+		dest.SetString(strconv.FormatUint(src, 10))
+		return nil
+	case float64:
+		dest.SetString(strconv.FormatFloat(src, 'G', -1, 64))
+		return nil
+	default:
+		return scanError(dest.Type(), src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
 }
 
 func scanBytes(dest reflect.Value, src interface{}) error {
@@ -269,8 +283,9 @@ func scanBytes(dest reflect.Value, src interface{}) error {
 
 		dest.SetBytes(clone)
 		return nil
+	default:
+		return scanError(dest.Type(), src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
 }
 
 func scanTime(dest reflect.Value, src interface{}) error {
@@ -299,8 +314,9 @@ func scanTime(dest reflect.Value, src interface{}) error {
 		destTime := dest.Addr().Interface().(*time.Time)
 		*destTime = srcTime
 		return nil
+	default:
+		return scanError(dest.Type(), src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
 }
 
 func scanScanner(dest reflect.Value, src interface{}) error {
@@ -463,7 +479,7 @@ func scanJSONIntoInterface(dest reflect.Value, src interface{}) error {
 	if fn := Scanner(dest.Type()); fn != nil {
 		return fn(dest, src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
+	return scanError(dest.Type(), src)
 }
 
 func scanInterface(dest reflect.Value, src interface{}) error {
@@ -479,7 +495,7 @@ func scanInterface(dest reflect.Value, src interface{}) error {
 	if fn := Scanner(dest.Type()); fn != nil {
 		return fn(dest, src)
 	}
-	return fmt.Errorf("bun: can't scan %#v into %s", src, dest.Type())
+	return scanError(dest.Type(), src)
 }
 
 func nilable(kind reflect.Kind) bool {
@@ -489,3 +505,7 @@ func nilable(kind reflect.Kind) bool {
 	}
 	return false
 }
+
+func scanError(dest reflect.Type, src interface{}) error {
+	return fmt.Errorf("bun: can't scan %#v (%T) into %s", src, src, dest.String())
+}

schema/sqltype.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"database/sql"
 	"encoding/json"
-	"fmt"
 	"reflect"
 	"time"
 
@@ -135,6 +134,6 @@ func (tm *NullTime) Scan(src interface{}) error {
 		tm.Time = newtm
 		return nil
 	default:
-		return fmt.Errorf("bun: can't scan %#v into NullTime", src)
+		return scanError(bunNullTimeType, src)
 	}
 }