Add cast error checking to refactored transformers

pkg/transformers/vat_move/repository.go

@@ -15,6 +15,7 @@
 package vat_move
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
@@ -29,9 +30,13 @@ func (repository VatMoveRepository) Create(headerID int64, models []interface{})
 		return err
 	}
 
-	var vatMove VatMoveModel
 	for _, model := range models {
-		vatMove = model.(VatMoveModel)
+		vatMove, ok := model.(VatMoveModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, VatMoveModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT INTO maker.vat_move (header_id, src, dst, rad, tx_idx, raw_log)
         	VALUES ($1, $2, $3, $4::NUMERIC, $5, $6)`,

pkg/transformers/vat_move/repository_test.go

@@ -16,7 +16,6 @@ package vat_move_test
 
 import (
 	"database/sql"
-
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
@@ -85,6 +84,12 @@ var _ = Describe("Vat Move", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = vatMoveRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MissingHeaders", func() {