for item in subjects {
      item.lessonAvailable = 0.0
      item.lessonCompleted = 0.0
      item.otherLesson = 0.0
      Database.shared.database.collection(item.databasePath + "/lessons").getDocuments(completion: {(query, error) in
        if let docs = query?.documents {
          for it in docs {
            do {
              let lesson = try Lesson(fromDictionary: it.data())
              if Database.shared.user.teacherIsContains(lesson.professorPath) {
                item.lessonAvailable += 1
                self.allAvailable += 1
                for i in Database.shared.user.completedLessonsKey {
                  if i["key"] == lesson.databaseID {
                    item.lessonCompleted += 1
                    self.allCompleted += 1
                    break
                  }
                }
              }
              else {
                for i in Database.shared.user.completedLessonsKey {
                  if i["key"] == lesson.databaseID {
                    item.otherLesson += 1
                    self.allOther += 1
                    break
                  }
                }
              }
            } catch {}
          }
        }
        for item in self.progressBars {
          item.removeFromSuperview()
        }
        self.tableView.reloadDataAnimated()
      })
    }
  }