Refactor delete handlers

Fixes #18.

models/characteristics.go

@@ -32,6 +32,10 @@ func (c *CharacteristicBase) UpdateError() error {
 	return errors.ErrCharacteristicNotUpdated
 }
 
+func (c *CharacteristicBase) DeleteError() error {
+	return errors.ErrCharacteristicNotDeleted
+}
+
 // CharacteristicBase is what the DB expects for write operations
 type CharacteristicBase struct {
 	ID                   int64           `json:"id,omitempty"`

models/interfaces.go

@@ -6,6 +6,7 @@ type base interface {
 	PreInsert(modl.SqlExecutor) error
 	PreUpdate(modl.SqlExecutor) error
 	UpdateError() error
+	DeleteError() error
 }
 
 // Create will create a new DB record of a model.
@@ -27,3 +28,15 @@ func Update(b base) error {
 	}
 	return nil
 }
+
+// Delete runs a DB delete on a model.
+func Delete(b base) error {
+	count, err := DBH.Delete(b)
+	if err != nil {
+		return err
+	}
+	if count != 1 {
+		return b.DeleteError()
+	}
+	return nil
+}

models/measurements.go

@@ -33,6 +33,10 @@ func (m *MeasurementBase) UpdateError() error {
 	return errors.ErrMeasurementNotUpdated
 }
 
+func (m *MeasurementBase) DeleteError() error {
+	return errors.ErrMeasurementNotDeleted
+}
+
 // MeasurementBase is what the DB expects for write operations
 // There are three types of supported measurements: fixed-text, free-text,
 // & numerical. The table has a constraint that will allow at most one

models/species.go

@@ -33,6 +33,10 @@ func (s *SpeciesBase) UpdateError() error {
 	return errors.ErrSpeciesNotUpdated
 }
 
+func (s *SpeciesBase) DeleteError() error {
+	return errors.ErrSpeciesNotDeleted
+}
+
 // SpeciesBase is what the DB expects for write operations.
 type SpeciesBase struct {
 	ID                  int64            `db:"id" json:"id"`

models/strains.go

@@ -33,6 +33,10 @@ func (s *StrainBase) UpdateError() error {
 	return errors.ErrStrainNotUpdated
 }
 
+func (s *StrainBase) DeleteError() error {
+	return errors.ErrStrainNotDeleted
+}
+
 // StrainBase is what the DB expects for write operations.
 type StrainBase struct {
 	ID                  int64            `db:"id" json:"id"`

models/users.go

@@ -34,6 +34,10 @@ func (u *UserBase) UpdateError() error {
 	return errors.ErrUserNotUpdated
 }
 
+func (u *UserBase) DeleteError() error {
+	return errors.ErrUserNotDeleted
+}
+
 // UserBase is what the DB expects to see for write operations.
 type UserBase struct {
 	ID        int64          `json:"id,omitempty"`