changed to plain errors further down the alerting validation model so error did…

changed to plain errors further down the alerting validation model so error did not get double wrapping in ValidationError

pkg/services/alerting/conditions/evaluator.go

@@ -2,6 +2,7 @@ package conditions
 
 import (
 	"encoding/json"
+	"fmt"
 
 	"github.com/grafana/grafana/pkg/components/null"
 	"github.com/grafana/grafana/pkg/components/simplejson"
@@ -31,12 +32,12 @@ type ThresholdEvaluator struct {
 func newThresholdEvaluator(typ string, model *simplejson.Json) (*ThresholdEvaluator, error) {
 	params := model.Get("params").MustArray()
 	if len(params) == 0 {
-		return nil, alerting.ValidationError{Reason: "Evaluator missing threshold parameter"}
+		return nil, fmt.Errorf("Evaluator missing threshold parameter")
 	}
 
 	firstParam, ok := params[0].(json.Number)
 	if !ok {
-		return nil, alerting.ValidationError{Reason: "Evaluator has invalid parameter"}
+		return nil, fmt.Errorf("Evaluator has invalid parameter")
 	}
 
 	defaultEval := &ThresholdEvaluator{Type: typ}
@@ -107,7 +108,7 @@ func (e *RangedEvaluator) Eval(reducedValue null.Float) bool {
 func NewAlertEvaluator(model *simplejson.Json) (AlertEvaluator, error) {
 	typ := model.Get("type").MustString()
 	if typ == "" {
-		return nil, alerting.ValidationError{Reason: "Evaluator missing type property"}
+		return nil, fmt.Errorf("Evaluator missing type property")
 	}
 
 	if inSlice(typ, defaultTypes) {
@@ -122,7 +123,7 @@ func NewAlertEvaluator(model *simplejson.Json) (AlertEvaluator, error) {
 		return &NoValueEvaluator{}, nil
 	}
 
-	return nil, alerting.ValidationError{Reason: "Evaluator invalid evaluator type: " + typ}
+	return nil, fmt.Errorf("Evaluator invalid evaluator type: %s", typ)
 }
 
 func inSlice(a string, list []string) bool {

pkg/services/alerting/rule.go

@@ -128,7 +128,7 @@ func NewRuleFromDBAlert(ruleDef *m.Alert) (*Rule, error) {
 	}
 
 	if len(model.Conditions) == 0 {
-		return nil, fmt.Errorf("Alert is missing conditions")
+		return nil, ValidationError{Reason: "Alert is missing conditions"}
 	}
 
 	return model, nil