Be able to list users submisions

- Closes: #45

lib/database/submissions.go

@@ -1,16 +1,26 @@
 package database
 
+// TODO: clean up old submissions
+
 type Submission struct {
 	ID           int    `sql:"type:serial"`
 	SubmissionID string `sql:"type:varchar(16)"`
 	Filename     string
 	Status       string
 	Comment      string
+	UserID       int `sql:"type:integer,unique"`
+	User         *User
 	BookID       string `sql:"type:varchar(16),unique"`
 	Book         *Book
 }
 
-func (db *pgDB) AddSubmission(submission Submission) (id int, err error) {
+func (db *pgDB) AddSubmission(submission Submission, userName string) (id int, err error) {
+	if userName != "" {
+		user, err := db.getUser(userName)
+		if err == nil {
+			submission.UserID = user.ID
+		}
+	}
 	err = db.sql.Insert(&submission)
 	return submission.ID, err
 }
@@ -61,6 +71,15 @@ func (db *pgDB) GetSubmission(submissionID string) (submission []Submission, err
 	return
 }
 
+func (db *pgDB) GetUserSubmissions(userName string) (submission []Submission, err error) {
+	err = db.sql.Model(&submission).
+		Column("Book", "User").
+		Where("username = ?", userName).
+		Order("id DESC").
+		Select()
+	return
+}
+
 func extractID(book *Book) interface{} {
 	if book == nil {
 		return nil