json-api error format

Part of #11.

models/characteristics.go

@@ -42,11 +42,15 @@ func (c *CharacteristicBase) validate() types.ValidationError {
 	cv := make(types.ValidationError, 0)
 
 	if c.CharacteristicName == "" {
-		cv["Name"] = []string{helpers.MustProvideAValue}
+		cv = append(cv, types.NewValidationError(
+			"characteristicName",
+			helpers.MustProvideAValue))
 	}
 
 	if c.CharacteristicTypeID == 0 {
-		cv["Characteristic Type"] = []string{helpers.MustProvideAValue}
+		cv = append(cv, types.NewValidationError(
+			"characteristicType",
+			helpers.MustProvideAValue))
 	}
 
 	if len(cv) > 0 {

models/measurements.go

@@ -43,11 +43,21 @@ func (m *MeasurementBase) validate() types.ValidationError {
 	mv := make(types.ValidationError, 0)
 
 	if m.StrainID == 0 {
-		mv["Strain"] = []string{helpers.MustProvideAValue}
+		mv = append(mv, types.NewValidationError(
+			"strain",
+			helpers.MustProvideAValue))
 	}
 
 	if m.CharacteristicID == 0 {
-		mv["Characteristic"] = []string{helpers.MustProvideAValue}
+		mv = append(mv, types.NewValidationError(
+			"characteristic",
+			helpers.MustProvideAValue))
+	}
+
+	if m.TextMeasurementTypeID.Valid == false && m.TxtValue.Valid == false && m.NumValue.Valid == false {
+		mv = append(mv, types.NewValidationError(
+			"value",
+			helpers.MustProvideAValue))
 	}
 
 	if len(mv) > 0 {
@@ -119,7 +129,9 @@ func (m *Measurement) UnmarshalJSON(b []byte) error {
 		id, err := GetTextMeasurementTypeID(v)
 		if err != nil {
 			if err == sql.ErrNoRows {
-				measurement.TxtValue = types.NullString{sql.NullString{String: v, Valid: true}}
+				if v != "" {
+					measurement.TxtValue = types.NullString{sql.NullString{String: v, Valid: true}}
+				}
 			} else {
 				return err
 			}

models/species.go

@@ -43,11 +43,15 @@ func (s *SpeciesBase) validate() types.ValidationError {
 	sv := make(types.ValidationError, 0)
 
 	if s.GenusID == 0 {
-		sv["Genus"] = []string{helpers.MustProvideAValue}
+		sv = append(sv, types.NewValidationError(
+			"genus",
+			helpers.MustProvideAValue))
 	}
 
 	if s.SpeciesName == "" {
-		sv["Species"] = []string{helpers.MustProvideAValue}
+		sv = append(sv, types.NewValidationError(
+			"speciesName",
+			helpers.MustProvideAValue))
 	}
 
 	if len(sv) > 0 {

models/strains.go

@@ -43,11 +43,15 @@ func (s *StrainBase) validate() types.ValidationError {
 	sv := make(types.ValidationError, 0)
 
 	if s.SpeciesID == 0 {
-		sv["Species"] = []string{helpers.MustProvideAValue}
+		sv = append(sv, types.NewValidationError(
+			"species",
+			helpers.MustProvideAValue))
 	}
 
 	if s.StrainName == "" {
-		sv["Name"] = []string{helpers.MustProvideAValue}
+		sv = append(sv, types.NewValidationError(
+			"strainName",
+			helpers.MustProvideAValue))
 	}
 
 	if len(sv) > 0 {

models/users.go

@@ -43,20 +43,28 @@ func (u *UserBase) validate() types.ValidationError {
 	uv := make(types.ValidationError, 0)
 
 	if u.Name == "" {
-		uv["Name"] = []string{helpers.MustProvideAValue}
+		uv = append(uv, types.NewValidationError(
+			"name",
+			helpers.MustProvideAValue))
 	}
 
 	if u.Email == "" {
-		uv["Email"] = []string{helpers.MustProvideAValue}
+		uv = append(uv, types.NewValidationError(
+			"email",
+			helpers.MustProvideAValue))
 	}
 
 	regex, _ := regexp.Compile(`(\w[-._\w]*\w@\w[-._\w]*\w\.\w{2,3})`)
 	if u.Email != "" && !regex.MatchString(u.Email) {
-		uv["Email"] = []string{"Must provide a valid email address"}
+		uv = append(uv, types.NewValidationError(
+			"email",
+			"Must provide a valid email address"))
 	}
 
 	if len(u.Password) < 8 {
-		uv["Password"] = []string{"Password must be at least 8 characters"}
+		uv = append(uv, types.NewValidationError(
+			"password",
+			"Password must be at least 8 characters"))
 	}
 
 	if len(uv) > 0 {

types/validation-error.go

@@ -2,7 +2,23 @@ package types
 
 import "encoding/json"
 
-type ValidationError map[string][]string
+type Source struct {
+	Pointer string `json:"pointer"`
+}
+
+type ErrorDetail struct {
+	Source `json:"source"`
+	Detail string `json:"detail"`
+}
+
+func NewValidationError(attr, message string) ErrorDetail {
+	return ErrorDetail{
+		Source: Source{Pointer: "data/attributes/" + attr},
+		Detail: message,
+	}
+}
+
+type ValidationError []ErrorDetail
 
 func (v ValidationError) Error() string {
 	errs, err := json.Marshal(struct {