Dirty implementation of createVotes

internal/models/votes.go

@@ -0,0 +1,57 @@
+package models
+
+import (
+	"database/sql"
+	"errors"
+)
+
+type VoteModelInterface interface {
+	Insert(voterIdentity string, electionId int, choiceText string, tokens int) (int, error)
+	Exists(voterIdentity string, electionID int) (bool, error)
+}
+
+type VoteModel struct {
+	DB *sql.DB
+}
+
+func (v *VoteModel) Insert(voterIdentity string, electionId int, choiceText string, tokens int) (int, error) {
+	tx, err := v.DB.Begin()
+	if err != nil {
+		return 0, err
+	}
+	defer tx.Rollback()
+
+	result, err := tx.Exec(`
+        INSERT INTO votes (voter_identity, election_id, choice_text, tokens)
+        VALUES (?, ?, ?, ?)`,
+		voterIdentity, electionId, choiceText, tokens)
+	if err != nil {
+		return 0, err
+	}
+
+	if err = tx.Commit(); err != nil {
+		return 0, err
+	}
+
+	voteId, err := result.LastInsertId()
+	return int(voteId), nil
+}
+
+func (v *VoteModel) Exists(voterIdentity string, electionID int) (bool, error) {
+	var exists bool
+	query := `
+		SELECT EXISTS (
+			SELECT 1
+			FROM votes
+			WHERE voter_identity = ? AND election_id = ?
+		)
+	`
+	err := v.DB.QueryRow(query, voterIdentity, electionID).Scan(&exists)
+	if err != nil {
+		if errors.Is(sql.ErrNoRows, err) {
+			return false, nil
+		}
+		return false, err
+	}
+	return exists, nil
+}