Update Flatten logic to handle new dive logic

doc.go

@@ -176,7 +176,7 @@ Here is a list of the current built in validators:
 	dive
 		This tells the validator to dive into a slice, array or map and validate that
 		level of the slice, array or map with the validation tags that follow.
-		Multidimensional nesting is also supported, each level you with to dive will
+		Multidimensional nesting is also supported, each level you wish to dive will
 		require another dive tag. (Usage: dive)
 		Example: [][]string with validation tag "gt=0,dive,len=1,dive,required"
 		gt=0 will be applied to []

validator.go

@@ -20,20 +20,19 @@ import (
 )
 
 const (
-	utf8HexComma    = "0x2C"
-	tagSeparator    = ","
-	orSeparator     = "|"
-	noValidationTag = "-"
-	tagKeySeparator = "="
-	structOnlyTag   = "structonly"
-	omitempty       = "omitempty"
-	required        = "required"
-	fieldErrMsg     = "Field validation for \"%s\" failed on the \"%s\" tag"
-	sliceErrMsg     = "Field validation for \"%s\" failed at index \"%d\" with error(s): %s"
-	mapErrMsg       = "Field validation for \"%s\" failed on key \"%v\" with error(s): %s"
-	structErrMsg    = "Struct:%s\n"
-	diveTag         = "dive"
-	// diveSplit           = "," + diveTag
+	utf8HexComma        = "0x2C"
+	tagSeparator        = ","
+	orSeparator         = "|"
+	noValidationTag     = "-"
+	tagKeySeparator     = "="
+	structOnlyTag       = "structonly"
+	omitempty           = "omitempty"
+	required            = "required"
+	fieldErrMsg         = "Field validation for \"%s\" failed on the \"%s\" tag"
+	sliceErrMsg         = "Field validation for \"%s\" failed at index \"%d\" with error(s): %s"
+	mapErrMsg           = "Field validation for \"%s\" failed on key \"%v\" with error(s): %s"
+	structErrMsg        = "Struct:%s\n"
+	diveTag             = "dive"
 	arrayIndexFieldName = "%s[%d]"
 	mapIndexFieldName   = "%s[%v]"
 )
@@ -193,6 +192,82 @@ func (e *FieldError) Error() string {
 	return fmt.Sprintf(fieldErrMsg, e.Field, e.Tag)
 }
 
+// Flatten flattens the FieldError hierarchical structure into a flat namespace style field name
+// for those that want/need it.
+// This is now needed because of the new dive functionality
+func (e *FieldError) Flatten() map[string]*FieldError {
+
+	errs := map[string]*FieldError{}
+
+	if e.IsPlaceholderErr {
+
+		if e.IsSliceOrArray {
+			for key, err := range e.SliceOrArrayErrs {
+
+				fe, ok := err.(*FieldError)
+
+				if ok {
+
+					if flat := fe.Flatten(); flat != nil && len(flat) > 0 {
+						for k, v := range flat {
+							if fe.IsPlaceholderErr {
+								errs[fmt.Sprintf("[%#v]%s", key, k)] = v
+							} else {
+								errs[fmt.Sprintf("[%#v]", key)] = v
+							}
+
+						}
+					}
+				} else {
+
+					se := err.(*StructErrors)
+
+					if flat := se.Flatten(); flat != nil && len(flat) > 0 {
+						for k, v := range flat {
+							errs[fmt.Sprintf("[%#v].%s.%s", key, se.Struct, k)] = v
+						}
+					}
+				}
+			}
+		}
+
+		if e.IsMap {
+			for key, err := range e.MapErrs {
+
+				fe, ok := err.(*FieldError)
+
+				if ok {
+
+					if flat := fe.Flatten(); flat != nil && len(flat) > 0 {
+						for k, v := range flat {
+							if fe.IsPlaceholderErr {
+								errs[fmt.Sprintf("[%#v]%s", key, k)] = v
+							} else {
+								errs[fmt.Sprintf("[%#v]", key)] = v
+							}
+						}
+					}
+				} else {
+
+					se := err.(*StructErrors)
+
+					if flat := se.Flatten(); flat != nil && len(flat) > 0 {
+						for k, v := range flat {
+							errs[fmt.Sprintf("[%#v].%s.%s", key, se.Struct, k)] = v
+						}
+					}
+				}
+			}
+		}
+
+		return errs
+	}
+
+	errs[e.Field] = e
+
+	return errs
+}
+
 // StructErrors is hierarchical list of field and struct validation errors
 // for a non hierarchical representation please see the Flatten method for StructErrors
 type StructErrors struct {
@@ -234,7 +309,17 @@ func (e *StructErrors) Flatten() map[string]*FieldError {
 
 	for _, f := range e.Errors {
 
-		errs[f.Field] = f
+		if flat := f.Flatten(); flat != nil && len(flat) > 0 {
+
+			for k, fe := range flat {
+
+				if f.IsPlaceholderErr {
+					errs[f.Field+k] = fe
+				} else {
+					errs[k] = fe
+				}
+			}
+		}
 	}
 
 	for key, val := range e.StructErrors {

validator_test.go

@@ -226,6 +226,163 @@ func AssertMapFieldError(t *testing.T, s map[string]*FieldError, field string, e
 	EqualSkip(t, 2, val.Tag, expectedTag)
 }
 
+func TestFlattenValidation(t *testing.T) {
+
+	type Inner struct {
+		Name string `validate:"required"`
+	}
+
+	type TestMultiDimensionalStructsPtr struct {
+		Errs [][]*Inner `validate:"gt=0,dive,dive,required"`
+	}
+
+	var errStructPtrArray [][]*Inner
+
+	errStructPtrArray = append(errStructPtrArray, []*Inner{&Inner{"ok"}, &Inner{""}, &Inner{"ok"}})
+
+	tmsp := &TestMultiDimensionalStructsPtr{
+		Errs: errStructPtrArray,
+	}
+
+	errs := validate.Struct(tmsp)
+	NotEqual(t, errs, nil)
+	Equal(t, len(errs.Errors), 1)
+	// for full test coverage
+	fmt.Sprint(errs.Error())
+
+	fieldErr := errs.Errors["Errs"]
+	Equal(t, fieldErr.IsPlaceholderErr, true)
+	Equal(t, fieldErr.IsSliceOrArray, true)
+	Equal(t, fieldErr.Field, "Errs")
+	Equal(t, len(fieldErr.SliceOrArrayErrs), 1)
+
+	innerSlice1, ok := fieldErr.SliceOrArrayErrs[0].(*FieldError)
+	Equal(t, ok, true)
+	Equal(t, innerSlice1.IsPlaceholderErr, true)
+	Equal(t, innerSlice1.Field, "Errs[0]")
+
+	flatFieldErr, ok := fieldErr.Flatten()["[0][1].Inner.Name"]
+	Equal(t, ok, true)
+	Equal(t, flatFieldErr.Field, "Name")
+	Equal(t, flatFieldErr.Tag, "required")
+
+	structErrFlatten, ok := errs.Flatten()["Errs[0][1].Inner.Name"]
+	Equal(t, ok, true)
+	Equal(t, structErrFlatten.Field, "Name")
+	Equal(t, structErrFlatten.Tag, "required")
+
+	errStructPtrArray = [][]*Inner{}
+	errStructPtrArray = append(errStructPtrArray, []*Inner{&Inner{"ok"}, nil, &Inner{"ok"}})
+
+	tmsp = &TestMultiDimensionalStructsPtr{
+		Errs: errStructPtrArray,
+	}
+
+	errs = validate.Struct(tmsp)
+	NotEqual(t, errs, nil)
+	Equal(t, len(errs.Errors), 1)
+	// for full test coverage
+	fmt.Sprint(errs.Error())
+
+	fieldErr = errs.Errors["Errs"]
+	Equal(t, fieldErr.IsPlaceholderErr, true)
+	Equal(t, fieldErr.IsSliceOrArray, true)
+	Equal(t, fieldErr.Field, "Errs")
+	Equal(t, len(fieldErr.SliceOrArrayErrs), 1)
+
+	innerSlice1, ok = fieldErr.SliceOrArrayErrs[0].(*FieldError)
+	Equal(t, ok, true)
+	Equal(t, innerSlice1.IsPlaceholderErr, true)
+	Equal(t, innerSlice1.Field, "Errs[0]")
+
+	flatFieldErr, ok = fieldErr.Flatten()["[0][1]"]
+	Equal(t, ok, true)
+	Equal(t, flatFieldErr.Field, "Errs[0][1]")
+	Equal(t, flatFieldErr.Tag, "required")
+
+	type TestMapStructPtr struct {
+		Errs map[int]*Inner `validate:"gt=0,dive,required"`
+	}
+
+	mip := map[int]*Inner{0: &Inner{"ok"}, 3: &Inner{""}, 4: &Inner{"ok"}}
+
+	msp := &TestMapStructPtr{
+		Errs: mip,
+	}
+
+	errs = validate.Struct(msp)
+	NotEqual(t, errs, nil)
+	Equal(t, len(errs.Errors), 1)
+
+	fieldError := errs.Errors["Errs"]
+	Equal(t, fieldError.IsPlaceholderErr, true)
+	Equal(t, fieldError.IsMap, true)
+	Equal(t, len(fieldError.MapErrs), 1)
+
+	innerStructError, ok := fieldError.MapErrs[3].(*StructErrors)
+	Equal(t, ok, true)
+	Equal(t, innerStructError.Struct, "Inner")
+	Equal(t, len(innerStructError.Errors), 1)
+
+	innerInnerFieldError, ok := innerStructError.Errors["Name"]
+	Equal(t, ok, true)
+	Equal(t, innerInnerFieldError.IsPlaceholderErr, false)
+	Equal(t, innerInnerFieldError.IsSliceOrArray, false)
+	Equal(t, innerInnerFieldError.Field, "Name")
+	Equal(t, innerInnerFieldError.Tag, "required")
+
+	flatErrs, ok := errs.Flatten()["Errs[3].Inner.Name"]
+	Equal(t, ok, true)
+	Equal(t, flatErrs.Field, "Name")
+	Equal(t, flatErrs.Tag, "required")
+
+	mip2 := map[int]*Inner{0: &Inner{"ok"}, 3: nil, 4: &Inner{"ok"}}
+
+	msp2 := &TestMapStructPtr{
+		Errs: mip2,
+	}
+
+	errs = validate.Struct(msp2)
+	NotEqual(t, errs, nil)
+	Equal(t, len(errs.Errors), 1)
+
+	fieldError = errs.Errors["Errs"]
+	Equal(t, fieldError.IsPlaceholderErr, true)
+	Equal(t, fieldError.IsMap, true)
+	Equal(t, len(fieldError.MapErrs), 1)
+
+	innerFieldError, ok := fieldError.MapErrs[3].(*FieldError)
+	Equal(t, ok, true)
+	Equal(t, innerFieldError.IsPlaceholderErr, false)
+	Equal(t, innerFieldError.IsSliceOrArray, false)
+	Equal(t, innerFieldError.Field, "Errs[3]")
+	Equal(t, innerFieldError.Tag, "required")
+
+	flatErrs, ok = errs.Flatten()["Errs[3]"]
+	Equal(t, ok, true)
+	Equal(t, flatErrs.Field, "Errs[3]")
+	Equal(t, flatErrs.Tag, "required")
+
+	type TestMapInnerArrayStruct struct {
+		Errs map[int][]string `validate:"gt=0,dive,dive,required"`
+	}
+
+	mias := map[int][]string{0: []string{"ok"}, 3: []string{"ok", ""}, 4: []string{"ok"}}
+
+	mia := &TestMapInnerArrayStruct{
+		Errs: mias,
+	}
+
+	errs = validate.Struct(mia)
+	NotEqual(t, errs, nil)
+	Equal(t, len(errs.Errors), 1)
+
+	flatErrs, ok = errs.Flatten()["Errs[3][1]"]
+	Equal(t, ok, true)
+	Equal(t, flatErrs.Field, "Errs[3][1]")
+	Equal(t, flatErrs.Tag, "required")
+}
+
 func TestInterfaceErrValidation(t *testing.T) {
 
 	var v1 interface{}
@@ -578,6 +735,11 @@ func TestArrayDiveValidation(t *testing.T) {
 	Equal(t, err.IsSliceOrArray, true)
 	Equal(t, len(err.SliceOrArrayErrs), 1)
 
+	// flat := err.Flatten()
+	// fe, ok := flat["[1]"]
+	// Equal(t, ok, true)
+	// Equal(t, fe.Tag, "required")
+
 	err = validate.Field(arr, "len=2,dive,required")
 	NotEqual(t, err, nil)
 	Equal(t, err.IsPlaceholderErr, false)
@@ -606,6 +768,12 @@ func TestArrayDiveValidation(t *testing.T) {
 	NotEqual(t, errs, nil)
 	Equal(t, len(errs.Errors), 1)
 
+	// flat = errs.Flatten()
+	// me, ok := flat["Errs[1]"]
+	// Equal(t, ok, true)
+	// Equal(t, me.Field, "Errs[1]")
+	// Equal(t, me.Tag, "required")
+
 	fieldErr, ok := errs.Errors["Errs"]
 	Equal(t, ok, true)
 	Equal(t, fieldErr.IsPlaceholderErr, true)
@@ -666,13 +834,15 @@ func TestArrayDiveValidation(t *testing.T) {
 	Equal(t, sliceError1.IsPlaceholderErr, true)
 	Equal(t, sliceError1.IsSliceOrArray, true)
 	Equal(t, len(sliceError1.SliceOrArrayErrs), 2)
+	Equal(t, sliceError1.Field, "Errs[0]")
 
 	innerSliceError1, ok := sliceError1.SliceOrArrayErrs[1].(*FieldError)
 	Equal(t, ok, true)
 	Equal(t, innerSliceError1.IsPlaceholderErr, false)
 	Equal(t, innerSliceError1.Tag, required)
 	Equal(t, innerSliceError1.IsSliceOrArray, false)
 	Equal(t, len(innerSliceError1.SliceOrArrayErrs), 0)
+	Equal(t, innerSliceError1.Field, "Errs[0][1]")
 
 	type Inner struct {
 		Name string `validate:"required"`
@@ -736,12 +906,25 @@ func TestArrayDiveValidation(t *testing.T) {
 	// for full test coverage
 	fmt.Sprint(errs.Error())
 
+	// flat := errs.Flatten()
+	// // fmt.Println(errs)
+	// fmt.Println(flat)
+	// expect Errs[0][1].Inner.Name
+	// me, ok := flat["Errs[1]"]
+	// Equal(t, ok, true)
+	// Equal(t, me.Field, "Errs[1]")
+	// Equal(t, me.Tag, "required")
+
 	fieldErr, ok = errs.Errors["Errs"]
 	Equal(t, ok, true)
 	Equal(t, fieldErr.IsPlaceholderErr, true)
 	Equal(t, fieldErr.IsSliceOrArray, true)
 	Equal(t, len(fieldErr.SliceOrArrayErrs), 3)
 
+	// flat := fieldErr.Flatten()
+	// fmt.Println(errs)
+	// fmt.Println(flat)
+
 	sliceError1, ok = fieldErr.SliceOrArrayErrs[0].(*FieldError)
 	Equal(t, ok, true)
 	Equal(t, sliceError1.IsPlaceholderErr, true)