无法解决500（内部服务器错误）代码

Question

我遇到一个500错误，在练习制作具有各种列表的待办事项应用程序以及执行所有具有完整CRUD选项的项目时，我无法解决。

待办事项清单代码：

class TodoList (db.Model):
    __tablename__ = 'todolists'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(), nullable=False)
    todos = db.relationship('Todo', backref='list', lazy=True)

const todo_list_input = document.getElementById('todo_list_id');
            document.getElementById('create_list_box_button').onsubmit = function(e) {
                e.preventDefault();
                const list_title = todo_list_input.value;
                todo_list_input.value = '';
                fetch('/todolists/create', {
                    method: 'POST',
                    body: JSON.stringify({
                        'todo_list_id': list_title,
                    }),
                    headers: {
                        'Contet-Type': 'application/json'
                    }
                })
                .then(response => response.json())
                .then(jsonResponse => {
                    const li = document.createElement('li');
                    const checkbox = document.createElement('input');
                    checkbox.className = 'check-completed';
                    checkbox.type = 'checkbox';
                    checkbox.setAttribute('data-id', jsonResponse.id);
                    li.appendChild(checkbox);

                    const text = document.createTextNode(' ' + jsonResponse.description);
                    li.appendChild(text);

                    const deleteButton = document.createElement('button');
                    deleteButton.className = 'delete-button';
                    deleteButton.setAttribute('data-id', jsonResponse.id);
                    deleteButton.innerHTML = '✗';
                    li.appendChild(deleteButton);

                    document.getElementById('todo_lists_buttons').appendChild(li);
                    document.getElementById('error').className = 'hidden';

                })
                .catch(function() {
                    console.error('Error occurred');
                    document.getElementById('error').className = '';
                })
            }


@app.route('/todolists/create', methods=['POST'])
def create_todoList():
    error = False
    body = {}
    try:
        list_name = request.json()['list_name']
        todoList = List(list_name=list_name)
        db.session.add(todoList)
        db.session.commit()
        body['list_name'] = todoList.list_name
    except:
        error = True
        db.session.rollback()
        print(sys.exc_info())
    finally:
        db.session.close()
    if not error:
        return jsonify(body)
    else:
        abort(500)

我一直在尝试更改变量名，那里没有乐趣，还有其他一些事情试图找出问题所在，并且对可能发生的事情还没有任何想法（对此还很陌生）。 / p>

这仅在尝试“创建”新的工作清单时发生。我可以在列表之间交换并创建/删除待办事项没有问题，只是创建列表不起作用。

待办事项代码：

class Todo(db.Model):
    __tablename__ = 'todos'
    id = db.Column(db.Integer, primary_key=True)
    description = db.Column(db.String(), nullable=False)
    completed = db.Column(db.Boolean, default=False)
    list_id = db.Column(db.Integer, db.ForeignKey('todolists.id'), nullable=False)

const todo_item_input = document.getElementById('description');
            document.getElementById('create_todo_box_button').onsubmit = function(e) {
                e.preventDefault();
                const desc = todo_item_input.value;
                todo_item_input.value = '';
                fetch('/todos/create', {
                    method: 'POST',
                    body: JSON.stringify({
                        'description': desc,
                        'list_id': {{ active_list.id }}
                    }),
                    headers: {
                        'Content-Type': 'application/json'
                    }
                })
                .then(response => response.json())
                .then(jsonResponse => {
                    const li = document.createElement('li');
                    const checkbox = document.createElement('input');
                    checkbox.className = 'check-completed';
                    checkbox.type = 'checkbox';
                    checkbox.setAttribute('data-id', jsonResponse.id);
                    li.appendChild(checkbox);

                    const text = document.createTextNode(' ' + jsonResponse.description);
                    li.appendChild(text);

                    const deleteButton = document.createElement('button');
                    deleteButton.className = 'delete-button';
                    deleteButton.setAttribute('data-id', jsonResponse.id);
                    deleteButton.innerHTML = '✗';

                    li.appendChild(deleteButton);

                    document.getElementById('todos').appendChild(li);

                    document.getElementById('error').className = 'hidden';
                })
                .catch(function() {
                    console.error('Error occured');
                    document.getElementById('error').className = '';
                })
            }

@app.route('/todos/create', methods=['POST'])
def create_todo():
    error = False
    body = {}
    try:
        description = request.get_json()['description']
        list_id = request.get_json()['list_id']
        todo = Todo(description=description)
        active_list = TodoList.query.get(list_id)
        todo.list = active_list
        db.session.add(todo)
        db.session.commit()
        body['description'] = todo.description
    except:
        error = True
        db.session.rollback()
        print(sys.exc_info())
    finally:
        db.session.close()
    if not error:
        return jsonify(body)
    else:
        abort(500)

Web app view Error

Answer 1

我会尝试在您的代码中添加更详细的异常。另外，我认为您可以在try ... accept

中进行error检查

@app.route('/todos/create', methods=['POST'])
def create_todo():
    body = {}
    try:
        description = request.get_json()['description']
        list_id = request.get_json()['list_id']
        todo = Todo(description=description)
        active_list = TodoList.query.get(list_id)
        todo.list = active_list
        db.session.add(todo)
        db.session.commit()
        body['description'] = todo.description
        return jsonify(body)
    except Exception as e:
        print(e)                  # ------- tracing
        db.session.rollback()
        print(sys.exc_info())
    finally:
        db.session.close()

    abort(500)