'for'루프가 두 번 수행되는 이유는 무엇입니까?

Question

내 응용 프로그램에서 양식 응답에 따라 dict를 만드는 for 루프가 있습니다. 그것은 두 번 실행 된 것 같습니다, 그래서 첫 번째 dict (좋은, 나는 그것을 볼 수 있습니다) 두 번째에 의해 지워집니다. 나는 그것이 두 번 수행 된 이유를 이해하지 못한다!

템플릿과 관련하여 문제가 발생했다고 생각되지만 (잘못된 것일 수 있습니다.)

@app.route('/torrent/<tor_id>', methods = ['GET','POST']) 
@login_required 
def torrent(tor_id): 
user = g.user 

# fetch informations about the torrent from transmission 
torrent = client.get_torrent(tor_id) 
# fetch information about the torrent from DB 
tordb = Torrent.query.filter_by(hashstring = torrent.hashString).first() 
if tordb.user != unicode(user): 
    return render_template("404.html") 
else: 
    ### 
    #error = '' 
    if torrent.error == 1: 
     torrent.error = 'tracker warning' 
    if torrent.error == 2: 
     torrent.error = 'tracker error' 
    if torrent.error == 3: 
     torrent.error = 'local error' 

    ### 
    #if torrent.seedRatioMode == 0: 
    # torrent.seedRatioMode = 'Global ratio limit' 
    #if torrent.seedRatioMode == 1: 
    # torrent.seedRatioMode = 'Individual ratio limit' 
    #if torrent.seedRatioMode == 2: 
    # torrent.seedRatioMode = 'Unlimited seeding' 
    control = TorrentForm(bandwidthpriority=torrent.bandwidthPriority,ratiomode=torrent.seedRatioMode) 
    ### 
    for file_x in client.get_files(tor_id)[torrent.id]: 
     f_form = TorrentFileDetails(csrf_enabled=False) 
     f_form.key = file_x 
     f_form.filename = unicode(client.get_files(tor_id)[torrent.id][file_x]['name']) 
     f_form.priority = client.get_files(tor_id)[torrent.id][file_x]['priority'] 
     f_form.size  = client.get_files(tor_id)[torrent.id][file_x]['size'] 
     f_form.completed = client.get_files(tor_id)[torrent.id][file_x]['completed'] 
     f_form.selected = client.get_files(tor_id)[torrent.id][file_x]['selected'] 

     control.files.append_entry(f_form) 

    # the form is not validated because of the csrf trick ! 
    if control.is_submitted(): 
     update = False 
     # by default, ratio limit can be updated ! 
     update_ratio_limit = True 
     if control.ratiomode.data != torrent.seedRatioMode: 

      if control.ratiomode.data == '0': 
       torrent.seed_ratio_mode = 'global' 
       # we don't allow anymore the ratio limit to be updated : the ratiolimit will be the gloabal one ! 
       update_ratio_limit = False 
      if control.ratiomode.data == '1': 
       torrent.seed_ratio_mode = 'single' 
      if control.ratiomode.data == '2': 
       torrent.seed_ratio_mode = 'unlimited' 
       # we don't allow anymore the ratio limit to be updated : the ratiolimit will be the gloabal one ! 
       update_ratio_limit = False 
      update = True 
     # if we are still allowed to update ratio limit 
     # eg : we haven't touched ratiomode in form - update_ratio_limit is still at its default : true 
     # or it has been changed to single mode 
     if update_ratio_limit: 
      if control.ratiolimit.data != torrent.seedRatioLimit: 
       torrent.seed_ratio_limit = float(control.ratiolimit.data) 
       torrent.seed_ratio_mode = 'single' 
       update = True 
     if control.downloadlimit.data != torrent.downloadLimit: 
      torrent.download_limit = int(control.downloadlimit.data) 
      update = True 
     if control.uploadlimit.data != torrent.uploadLimit: 
      torrent.upload_limit = int(control.uploadlimit.data) 
      update = True 
     if control.bandwidthpriority.data != torrent.bandwidthPriority: 
      if control.bandwidthpriority.data == '-1': 
       torrent.priority = 'low' 
      if control.bandwidthpriority.data == '1': 
       torrent.priority = 'high' 
      if control.bandwidthpriority.data == '0': 
       torrent.priority = 'normal' 
      update = True 

     # we use the ID returned by transmission itself ! Not the hashString. 
     # the first torrent.id is to say which torrent we are talking about. Transmission gives us a dict containing the info for the torrents asked. 
     # so the dict contains ONE torrent info 
     # but still, begin with the torrent.id, this is why the second torrent.id 
     files_answers = {} 

     for file_un in control.files: <<<< This is this loop which is executed two times ! 
      # create a dict that contains the new priority for each file according to the form 
      file_answer = {} 
      if file_un.priority.data != client.get_files(tor_id)[torrent.id][int(file_un.key.data)]['priority']: 
       file_answer['priority'] = file_un.priority.data 

      if file_un.selected.data != client.get_files(tor_id)[torrent.id][int(file_un.key.data)]['selected']: 
       file_answer['selected'] = file_un.selected.data 

      # append the dict to the general dict previously created (files_answers). 
      # the key is the ID of the file itself ! >> no value name ! 
      files_answers[int(file_un.key.data)] = file_answer 

     #finally, we create the last dict which will contain only one value : the files_answers dict ! 
     answer = {} 
     answer[int(torrent.id)] = files_answers 
     update = True 
     client.set_files(answer) 

     if update: 
      torrent.update() 
     #start_stop_torrent(tor_id) 
    return render_template("torrent.html", title = torrent.name, user = user, torrent = torrent, control = control) 

마지막 형태 : 여기

{% extends "base.html" %} 
{% block content %} 
<h1>{{torrent.name}} is {{torrent.status}}</h1> 

<form class="uk-form uk-form-row uk-form-horizontal" action="/torrent/{{torrent.hashString}}" method="post" name="torrent" > 
{{control.hidden_tag()}} 
<p> 
<ul class="uk-breadcrumb"> 
    <li><a href='/start/{{torrent.hashString}}'>Start</a></li> 
    <li><a href='/stop/{{torrent.hashString}}'>Stop</a></li> 
</ul> 
<button class="uk-button" name="button" id="button" type="submit" value="update">Update</button> 
</p> 

<div class="uk-grid"> 
<div class="uk-width-1-3 uk-panel uk-panel-header"> 
    <h3 class="uk-panel-title">Status</h3> 
    <ul class="uk-list"> 
    <li>Progress of download process : {{torrent.progress}} %</li> 
    <li>Priority : {{control.bandwidthpriority(default=torrent.bandwidthPriority)}}</li> 
    <li>Date of start : {{momentjs(torrent.addedDate).calendar()}}</li> 
    <li>Last start date : {{torrent.startDate}}</li> 
    {# <li>Estimated remaining time : {{torrent.eta}}</li> 
    <li>Leechers : {{torrent.leechers}}</li> 
    <li>Seeders : {{torrent.seeders}}</li> #} 
    </ul> 
</div> 
    ... 
all kind of info but no controls 


    </div> 

    <p>Total size : {{torrent.totalSize|filesize}}</p> 

{% if torrent.error != 0 %} 
<p>There's a {{torrent.error}} :<br /> 
{{torrent.errorString}}</p> 
{% endif %} 

<h2>Files</h2> 
<table class="uk-table"> 
    <tr> 
     <th>File name</th> 
     <th>Completed/Size</th> 
     <th>Selected</th> 
     <th>Priority</th> 
    </tr> 

    {% for file in control.files %} 
    <tr> 
    {{file.key}} 
     <td>{{file.filename.data}}</td> 
     <td>{{file.completed.data}}/{{file.size.data}}</td> 
     <td>{{file.selected}}</td> 
     <td>{{file.priority}}</td> 
     {# <td><button type="submit">Send</button></td> #} 
    </tr> 
    {% endfor %} 
</table> 
</form> 
{% endblock %} 

뷰입니다 : 여기

템플릿입니다 exemple에 대한

# each individual file in the torrent have its own priority, thus, we need to manage them individually ! 
class TorrentFileDetails(Form): 
key = HiddenField('key') 
filename = HiddenField('filename') 
size  = HiddenField('size') 
completed = HiddenField('completed') 
selected = BooleanField('selected') 
priority = SelectField(u'File priority',choices=[('low','low'),('normal','normal'),('high','high')]) 

# we desactivate the csrf cause this particular form is within the TorretForm, so it can't be several csrf at the same time ! 
def __init__(self, *args, **kwargs): 
    kwargs['csrf_enabled'] = False 
    super(TorrentFileDetails, self).__init__(*args, **kwargs) 

class TorrentForm(Form): 
hidden  = HiddenField('hidden') 
ratiolimit = DecimalField("ratio") 
ratiomode = SelectField(u'Ratio mode', choices=[(0,'Global ratio limit'),(1,'Individual ratio limit'),(2,'Unlimited seeding')]) 
downloadlimit = DecimalField("down") 
uploadlimit  = DecimalField("up") 
bandwidthpriority = SelectField(u'Torrent priority', choices=[(-1,'low'),(0,'normal'),(1,'high')]) 

# we append each individual file form to this, as we don't know how many there is in each torrent ! 
files  = FieldList(FormField(TorrentFileDetails)) 

, 여기에 HTML 페이지/형태 iso 급류. 그래서 급류에 하나의 파일이 있습니다!

<form class="uk-form uk-form-row uk-form-horizontal" action="/torrent/e3811b9539cacff680e418124272177c47477157" method="post" name="torrent" > 
    <div style="display:none;"><input id="csrf_token" name="csrf_token" type="hidden" value="20131212140726##1a06938d263188231da3de53ec343984b6b1e92b"><input id="csrf" name="csrf" type="hidden" value=""></div> 
    <p> 
     <ul class="uk-breadcrumb"> 
     <li><a href='/start/e3811b9539cacff680e472177c47477157'>Start</a></li> 
     <li><a href='/stop/e3811b9539cacff680e472177c47477157'>Stop</a></li> 
     </ul> 
     <button class="uk-button" name="button" id="button" type="submit" value="update">Update</button> 
    </p> 

    <div class="uk-grid"> 
<div class="uk-width-1-3 uk-panel uk-panel-header"> 
    <h3 class="uk-panel-title">Status</h3> 
    <ul class="uk-list"> 
    <li>Total size : 0.9 GiB</li> 
    <li>Progress of download process : 100.0 %</li> 
    <li>Priority : <select id="bandwidthpriority" name="bandwidthpriority"><option value="-1">low</option><option selected value="0">normal</option><option value="1">high</option></select></li> 

    </ul> 
</div> 
<div class="uk-width-1-3 uk-panel uk-panel-header"> 
    <h3 class="uk-panel-title">Downloading</h3> 
    <ul class="uk-list"> 
    <li>Number of peers sending to us : 0</li> 
    <li>Download rate : 0 bits/s</li> 
    <li>Download limit : <input class="uk-form-width-small" id="downloadlimit" name="downloadlimit" type="number" value="100"> KB/s</li> 
    <li></li> 
    <li>Corrupt data downloaded : 0.0 KiB</li> 
    </ul> 
</div> 
<div class="uk-width-1-3 uk-panel uk-panel-header"> 
    <h3 class="uk-panel-title">Uploading</h3> 
    <ul class="uk-list"> 
    <li>Number of peers getting from us : 0</li> 
    <li>Upload rate : 0 bits/s</li> 
    <li><label class="uk-form-label" for="">Upload limit :</label><div class="uk-form-controls"><input class="uk-form-width-small" id="uploadlimit" name="uploadlimit" type="number" value="100"> KB/s</div></li> 
    <li></li> 
    <li><label class="uk-form-label" for="">Ratio mode :</label><div class="uk-form-controls"><select id="ratiomode" name="ratiomode"><option selected value="0">Global ratio limit</option><option value="1">Individual ratio limit</option><option value="2">Unlimited seeding</option></select></div></li> 
    <li><label class="uk-form-label" for="">Ratio limit :</label><div class="uk-form-controls"><input class="uk-form-width-small" id="ratiolimit" name="ratiolimit" step="0.1" type="number" value="2"></div></li> 
    <li>Ratio : 0.0</li> 
    </ul> 
</div> 
</div> 



<h2>Files</h2> 
<table class="uk-table"> 
    <tr> 
     <th>File name</th> 
     <th>Completed/Size</th> 
     <th>Selected</th> 
     <th>Priority</th> 
    </tr> 


    <tr> 
    <input id="files-0-key" name="files-0-key" type="hidden" value="0"> 
     <td>ubuntu-13.10-desktop-amd64.iso</td> 
     <td>835584/925892608</td> 
     <td><input checked id="files-0-selected" name="files-0-selected" type="checkbox" value="y"></td> 
     <td><select id="files-0-priority" name="files-0-priority"><option value="low">low</option><option selected value="normal">normal</option><option value="high">high</option></select></td> 

    </tr> 

</table> 
</form> 

</div> 
</body> 
</html> 

Answer 1

루프가 두 번하지 않습니다!

버튼을 누르고 validate_on_submit을 수행 할 때 게시물에 이중 응답이 있습니다. 사용자가 제공하고자하는 답변과 원본 데이터! 버튼 타격 후

[{'completed': 9705687, 'selected': True, 'filename': u'WADs/Doom WADs.7z', 'priority': u'normal', 'key': 0, 'size': 9705687}, 
{'completed': 4571349, 'selected': True, 'filename': u'WADs/Heretic WADs.7z', 'priority': u'normal', 'key': 1, 'size': 4571349}, 
{'completed': 7757653, 'selected': True, 'filename': u'WADs/Hexen WADs.7z', 'priority': u'normal', 'key': 2, 'size': 7757653}] 

:

버튼을 타격하기 전에

[{'completed': u'', 'selected': True, 'filename': u'', 'priority': u'normal', 'key': u'0', 'size': u''}, 
{'completed': u'', 'selected': True, 'filename': u'', 'priority': u'normal', 'key': u'1', 'size': u''}, 
{'completed': u'', 'selected': True, 'filename': u'', 'priority': u'normal', 'key': u'2', 'size': u''}, 
{'completed': 9705687, 'selected': True, 'filename': u'WADs/Doom WADs.7z', 'priority': u'normal', 'key': 0, 'size': 9705687}, 
{'completed': 4571349, 'selected': True, 'filename': u'WADs/Heretic WADs.7z', 'priority': u'normal', 'key': 1, 'size': 4571349}, 
{'completed': 7757653, 'selected': True, 'filename': u'WADs/Hexen WADs.7z', 'priority': u'normal', 'key': 2, 'size': 7757653}] 

그래서, 처리 대답은 좋은 시간을 통해 이동을하고 원래의 데이터를 통과하고, 삭제 우리가 전달하고자하는 좋은 가치.