Merge pull request #226 from shoriwe/fix/improve-error-context

fix #225: improve error-msg context for unsupported types during interpolation

interpolate.go

@@ -697,7 +697,7 @@ func encodeValue(buf []byte, arg interface{}, flavor Flavor) ([]byte, error) {
 			}
 
 			if elem := primative.Type().Elem(); elem.Kind() != reflect.Uint8 {
-				return nil, ErrInterpolateUnsupportedArgs
+				return nil, fmt.Errorf("%w: only byte slices are supported", ErrInterpolateUnsupportedArgs)
 			}
 
 			var data []byte
@@ -750,11 +750,11 @@ func encodeValue(buf []byte, arg interface{}, flavor Flavor) ([]byte, error) {
 				buf = append(buf, "')"...)
 
 			default:
-				return nil, ErrInterpolateUnsupportedArgs
+				return nil, fmt.Errorf("%w: unsupported flavor for hex number", ErrInterpolateUnsupportedArgs)
 			}
 
 		default:
-			return nil, ErrInterpolateUnsupportedArgs
+			return nil, fmt.Errorf("%w: %s", ErrInterpolateUnsupportedArgs, primative.Type().Name())
 		}
 	}
 

interpolate_test.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"strconv"
+	"strings"
 	"testing"
 	"time"
 
@@ -385,7 +386,7 @@ func TestFlavorInterpolate(t *testing.T) {
 			query, err := c.Flavor.Interpolate(c.SQL, c.Args)
 
 			a.Equal(query, c.Query)
-			a.Assert(err == c.Err || err.Error() == c.Err.Error())
+			a.Assert(errors.Is(err, c.Err) || strings.Contains(err.Error(), c.Err.Error()))
 		})
 	}
 }