fix: ValidateMapCtx support for more baked-in validators

validator_instance.go

@@ -172,10 +172,17 @@ func (v Validate) ValidateMapCtx(ctx context.Context, data map[string]interface{
 				errs[field] = errors.New("The field: '" + field + "' is not a map to dive")
 			}
 		} else if ruleStr, ok := rule.(string); ok {
-			err := v.VarCtx(ctx, data[field], ruleStr)
+			if dataField, ok := data[field]; ok {
+				err := v.VarWithValueCtx(ctx, dataField, data, ruleStr)
 				if err != nil {
 					errs[field] = err
 				}
+			} else {
+				err := v.VarWithValueCtx(ctx, "", data, ruleStr)
+				if err != nil {
+					errs[field] = err
+				}
+			}
 		}
 	}
 	return errs

validator_test.go

@@ -12214,6 +12214,48 @@ func TestValidate_ValidateMapCtx(t *testing.T) {
 			},
 			want: 1,
 		},
+
+		{
+			name: "test map with relative rules",
+			args: args{
+				data: map[string]interface{}{
+					"Test_A": "Test_A",
+					"Test_B": "Test_B",
+					"Test_C": "Test_C",
+					"Test_D": "Test_D",
+					"Test_F": "Test_F",
+				},
+				rules: map[string]interface{}{
+					"Test_A": "required_if=[Test_B] Test_B",
+					"Test_B": "required_with=[Test_A]",
+					"Test_C": "required_with_all=[Test_A] [Test_B]",
+					"Test_D": "required_without=[Test_F]",
+					"Test_E": "required_without_all=[Test_D] [Test_F]",
+					"Test_F": "required_unless=[Test_E] Test_E",
+				},
+			},
+			want: 0,
+		},
+
+		{
+			name: "test map err with relative rules",
+			args: args{
+				data: map[string]interface{}{
+					"Test_B": "Test_B",
+					"Test_C": "Test_C",
+					"Test_D": "Test_D",
+				},
+				rules: map[string]interface{}{
+					"Test_A": "required_if=[Test_B] Test_B",
+					"Test_B": "required_with=[Test_A]",
+					"Test_C": "required_with_all=[Test_A] [Test_B]",
+					"Test_D": "required_without=[Test_F]",
+					"Test_E": "required_without_all=[Test_F] [Test_G]",
+					"Test_F": "required_unless=[Test_E] Test_E",
+				},
+			},
+			want: 3,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {