如何通过点符号访问数据

Question

目标：从 assessment_obj 拉取 video_id，分配给变量
数据库类型：SQLAlchemy
模型：Assessment 持有 video_id 多对一关系（多个评估可以使用视频）

1.)我正在尝试使用dot.notation从评估2.)中提取video_id，以便我可以使用retrieve方法提取视频信息（例如 url）。

用途：视频 url 将用于通过 JINJA2 模板/HTML 代码进入视频播放器 src。 （如果我使用的行话不正确，我深表歉意，因为我是新手，正在努力更好地理解这些概念。）

我试图遵循 OOP dot.notation tutorial，但不确定如何从 table 中提取数据并分配给变量而不意外重新分配变量。

views.py
表单视图配置。

@view_config(route_name='save_assessment_result', renderer='templates/completedpage.jinja2')
def save_assessment_result(request):
    with transaction.manager:
        assessment_id = int(request.params['assessment_id'])
        assessment_obj = api.retrieve_assessment(assessment_id) # the assessment

        assessment_obj.video_id = video # this right? 
        thevid = api.retrieve_video(video) #retrieves the video via ID
        template_video = int(request.params['video'])
        # how do I get the retrieved video 'thevid' into the template? 

        # more code 

       transaction.commit()
       return HTTPCreated()

模板: templates/assessment_form.jinja2

  <div class="embed-responsive embed-responsive-16by9">
    <iframe width="640" height="360" class="embed-responsive-item" allowfullscreen name='video' src="{{ url }}"></iframe>
  </div>

新：Return assessment_obj。新 View_Config.
注： 'videoname': video.videoname, 'length': video.length, 'url': video.url

@view_config(route_name='assessment', request_method='GET', renderer='templates/assessment_form.jinja2')
def assessment_form_view(request):
    with transaction.manager:
        assessment_id = int(request.matchdict['id'])
        assessment = api.retrieve_assessment(assessment_id)
        if not assessment:
            raise HTTPNotFound()
        video_id = int(request.matchdict['id']) # <--- this gives the assessmnet_id and not the video
        video = api.retrieve_video(video_id)
        return {'assessment_id': assessment_id, 'assessment_name': assessment.name, 'assessment_text': assessment.text, 'user_id': assessment.user_id, 'video_id':assessment.video_id, 'categories': ','.join([str(i) for i in assessment.categories]), 'video_id':video_id, 'videoname': video.videoname, 'length': video.length, 'url': video.url}

Answer 1

在行 assessment_obj.video_id = video - video 变量来自哪里？

看到您正在尝试 "pull the data from a table and assign to a variable" 我想知道您是否真的尝试将 assessment_obj.video_id 分配给一个名为 video 的变量。在这种情况下，它应该是另一种方式：

video = assessment_obj.video_id

然后你的代码几乎开始有意义了。要将数据传递给模板，您只需 return 来自视图函数的字典：

@view_config(route_name='save_assessment_result', renderer='templates/assessment_form.jinja2')
def save_assessment_result(request):
    with transaction.manager:
        assessment_id = int(request.params['assessment_id'])
        assessment_obj = api.retrieve_assessment(assessment_id) # the assessment

        video_id = assessment_obj.video_id
        thevid = api.retrieve_video(video_id)
        template_video = int(request.params['video'])
        return {
           'thevid': thevid,
           'template_video': template_video
        }

然后在您的模板中您可以引用这些变量及其成员：

<iframe ... src="{{ thevid.url }}"></iframe>

Answer 2

根据 Sergey 的出色指导，我创建了一个新的视图配置来加载评估和视频。然后我返回了所需的值。

工作代码：

@view_config(route_name='assessment', request_method='GET', renderer='templates/assessment_form.jinja2')
def assessment_form_view(request):
    with transaction.manager:
        assessment_id = int(request.matchdict['id'])
        assessment = api.retrieve_assessment(assessment_id)
        if not assessment:
            raise HTTPNotFound()

        video = assessment.video_id
        print 'test_video_id', video
        video_obj = api.retrieve_video(video)
        print 'test_video_obj', video_obj

        return {'assessment_id': assessment_id, 'assessment_name': assessment.name, 'assessment_text': assessment.text, 'user_id': assessment.user_id, 'categories': ','.join([str(i) for i in assessment.categories]), 'url': video_obj.url, 'video_id':video_obj.video_id, 'videoname': video_obj.videoname, 'length': video_obj.length}

如何通过点符号访问数据

How to access data via dot-notation

python

oop

syntax

pyramid