为什么我可以接收数据但无法正确呈现数据（angularjs 和 flask-restapi/jinja2）

Question

我尝试调试了大约 2 个小时，但没有成功。

这是我的错误：

jinja2.exceptions.UndefinedError jinja2.exceptions.UndefinedError: 'item' is undefined

我可以正确接收数据（$scope.questions）。

我的index.html:

<html>

<head>
</head>

<body>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>

    <div ng-app="myApp" ng-controller="myCtrl">
        <div ng-repeat="item in questions">
            {{item.question}}
        </div>
    </div>

    <script>
        var app = angular.module('myApp', []);
        app.controller('myCtrl', function ($scope, $http) {
            $http({
                method: "GET",
                url: "http://127.0.0.1:5000/questions"
            }).then(function mySuccess(response) {
                $scope.questions = response.data;
            }, function myError(response) {
                $scope.myWelcome = response.statusText;
            });
        });
    </script>
</body>

</html>

我的服务器端：

import os

from flask import Flask, request, render_template, Response
from flask_restful import Resource, Api

app = Flask(__name__)
api = Api(app)

question_id_serial = 2
questions = {
    1: {
        'id': 1,
        'question': 'Is this hard?',
    },
    2: {
        'id': 2,
        'question': 'Who is going to win the SuperBowl in 2017?',
    }
}

answer_id_serial = 6
answers = {
    1: {
        'id': 1,
        'question_id': 1,
        'answer': 'Yes',
        'count': 0
    },
    2: {
        'id': 2,
        'question_id': 1,
        'answer': 'No',
        'count': 0
    },
    3: {
        'id': 3,
        'question_id': 2,
        'answer': 'Eagles',
        'count': 0
    },
    4: {
        'id': 4,
        'question_id': 2,
        'answer': 'Patriots',
        'count': 0
    },
    5: {
        'id': 5,
        'question_id': 2,
        'answer': 'Seahawks',
        'count': 0
    },
    6: {
        'id': 6,
        'question_id': 2,
        'answer': 'Broncos'
    }
}


class Answer(Resource):
    def get(self, answer_id):
        return answers[answer_id]

    def put(self, answer_id):
        answer = answers[answer_id]
        data = request.get_json()
        values = {k: data.get(k, v) for k, v in answer.items()}
        answers[answer_id].update(values)
        return values

    def delete(self, answer_id):
        values = answers[answer_id]
        del answers[answer_id]
        return values

class Answers(Resource):
    def get(self):
        return answers.values()

    def post(self):
        global answer_id_serial
        answer_id_serial += 1
        data = request.get_json()
        values = {
            'id': answer_id_serial,
            'answer': data['answer'],
            'count': data.get('count', 0),
            'question_id': data['question_id']
        }

        answers[answer_id_serial] = values
        return values


class Question(Resource):
    def get(self, question_id):
        data = questions[question_id].copy()
        data['answers'] = [ans for ans in answers.values() if ans['question_id'] == question_id]
        return data

    def put(self, question_id):
        question = questions[question_id]
        data = request.get_json()
        data.pop('answers', [])
        values = {k: data.get(k, v) for k, v in question.items()}
        questions[question_id].update(values)
        values['answers'] = [ans for ans in answers.values() if ans['question_id'] == question_id]
        return values

    def delete(self, question_id):
        values = questions[question_id]
        del questions[question_id]
        values['answers'] = [ans for ans in answers.values() if ans['question_id'] == question_id]
        return values


class Questions(Resource):
    def get(self):
        output = []
        for question in  questions.values():
            question = question.copy()
            question['answers'] = [ans for ans in answers.values() if ans['question_id'] == question['id']]
            output.append(question)
        return output

    def post(self):
        global question_id_serial
        question_id_serial += 1
        data = request.get_json()
        values = {
            'id': question_id_serial,
            'question': data['question']
        }
        questions[question_id_serial] = values
        return values

api.add_resource(Questions, '/questions')
api.add_resource(Question,  '/questions/<int:question_id>')
api.add_resource(Answers,   '/answers')
api.add_resource(Answer,    '/answers/<int:answer_id>')

@app.route('/')
def show_page():
    return render_template('index.html')

@app.route('/assets/<path:path>')
def get_resource(path):
    mimetypes = {
        '.css': 'text/css',
        '.html': 'text/html',
        '.js': 'application/javascript'
    }

    content = open(path).read()
    return Response(content, mimetype=mimetypes[os.path.splitext(path)[1]])

if __name__ == '__main__':
    app.run(debug=True)

Answer 1

html 来自 render_template('index.html') 吗？

如果是这样，您将无法使用 Flask 渲染模板，然后尝试使用 Angular 再次渲染它。

基本上你的 ng-repeat 不工作，Flask 无法识别 {{ item }}，因此错误。

Answer 2

将{% raw %}和{% endraw %}添加到模板后，现在可以正常使用了。

我附上了工作模板，希望这对未来使用 Flask Restapi 和 AngularJS:

的开发人员有所帮助

{% raw %}
<!DOCTYPE html>
<html>

<head>
</head>

<body>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>

    <div ng-app="myApp" ng-controller="myCtrl">

        <h1 ng-repeat="question in questions">{{question.question}}</h1>

    </div>

    <script>
        var app = angular.module('myApp', []);
        app.controller('myCtrl', function ($scope, $http) {
            $http({
                method: "GET",
                url: "http://127.0.0.1:5000/questions"
            }).then(function mySuccess(response) {
                $scope.questions = response.data;
            }, function myError(response) {
                $scope.myWelcome = response.statusText;
            });
        });
    </script>
</body>

</html>
{% endraw %}

为什么我可以接收数据但无法正确呈现数据（angularjs 和 flask-restapi/jinja2）

Why I cannot render data correctly although I can receive data (angularjs with flask-restapi/jinja2)

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flask-restful