Python Django，如何迭代不同长度的一对多字段

我是Django的新手，我正在尝试创建一个应用程序来显示网球比赛结果。到目前为止，出乎我的意料，我已经设法拼凑出一些有效的代码

然而，我现在有一个问题，尽管目前我想在一个模板中列出匹配项及其分数，但是每个匹配项的集合数量可能不同，当我迭代它们时，我会得到一个索引错误。有些比赛可能有2盘，其他的3盘、4盘或5盘。。。如果一名球员退役，也许有些球员甚至只有1名

我有比赛和每场比赛的模型，就像这样。（我可以获得比赛日期、比赛、结果和Set1等，以便玩家显示，因为这些列表都具有相同数量的值。但是，set3的列表长度作为示例要短得多，并且会导致错误。）：

型号.py

class Match(models.Model):
    match_ID = models.AutoField(primary_key=True)
    match_date = models.DateField()
    players = models.ManyToManyField(Team, through='MatchStats', related_name='pim')
    hometeam = models.ForeignKey(Team, to_field='teamname', related_name='hometeam')
    awayteam = models.ForeignKey(Team, to_field='teamname', related_name='awayteam')
    hometeam_sets = models.IntegerField()
    awayteam_sets = models.IntegerField()

class Set(models.Model):
    set_ID = models.AutoField(primary_key=True)
    match = models.ForeignKey(Match)
    set_number = models.IntegerField()
    hometeam_games = models.IntegerField(default=0)
    awayteam_games = models.IntegerField(default=0)

def playermatches(request, player_ID):
    context = RequestContext(request)
    p = get_object_or_404(Player, pk=player_ID)
    match_list = Match.objects.filter(players=player_ID).order_by('-match_date')[:100]

    i = len(match_list)
    j = 0

    #This works as all test matches have a 1st set!
    s1_list = Set.objects.filter(match=match_list, set_number=1).order_by(-match__match_date')[:100]
    """
    I am totally out of ideas as to what I might do next though. 
    Tried various things like 'if exists', 'try except IndexError etc'. 
    Below was the last thing I tried which failed yet again.
    """

    s3_list = []
    while j < i:
        s3 = Set.objects.filter(match=match_list, set_number=3)[j]
        if s3:
            s3_list.append(s2)
        else:
            s3 = Set.objects.filter(set_ID=1)
            s3_list.append(s3)

    lst1 = match_list
    lst2 = result_list
    lst3 = s1_list
    ...
    lst5 = s3_list

    mandr = zip(lst1, lst2, lst3,... lst5)

    context_dict = {...}
    return render_to_response('stats/players.html', context_dict, context)

m_list = match_list
r_list = result_list

list1 = s1_list
list2 = s2_list
..............
list5 = s3_list

mandr = zip(m_list, r_list)
my_lists = zip(list1, list2, ..., lst5)

{% if matches %}
<ul>
    {% for match, team in mandr %}
    <li>{{ match.match_date }} <a href="/stats/match/{{ match.match_ID }}/">
    {{ match.hometeam }} vs. {{ match.awayteam }}</a> ( {{ team.result }} )</li>
    <li>{{ match.hometeam_sets }}:{{ match.awayteam_sets }} --
        {% for lst in my_lists %} 
            <li>{{ lst.hometeam_games }}</li>
        {% endfor %}
    {% endfor %}
</ul>
{% else %}
    <br/>
    <strong>There are currently no matches in the system - try again tomorrow!</strong>
{% endif %}

视图.py

class Match(models.Model):
    match_ID = models.AutoField(primary_key=True)
    match_date = models.DateField()
    players = models.ManyToManyField(Team, through='MatchStats', related_name='pim')
    hometeam = models.ForeignKey(Team, to_field='teamname', related_name='hometeam')
    awayteam = models.ForeignKey(Team, to_field='teamname', related_name='awayteam')
    hometeam_sets = models.IntegerField()
    awayteam_sets = models.IntegerField()

class Set(models.Model):
    set_ID = models.AutoField(primary_key=True)
    match = models.ForeignKey(Match)
    set_number = models.IntegerField()
    hometeam_games = models.IntegerField(default=0)
    awayteam_games = models.IntegerField(default=0)

def playermatches(request, player_ID):
    context = RequestContext(request)
    p = get_object_or_404(Player, pk=player_ID)
    match_list = Match.objects.filter(players=player_ID).order_by('-match_date')[:100]

    i = len(match_list)
    j = 0

    #This works as all test matches have a 1st set!
    s1_list = Set.objects.filter(match=match_list, set_number=1).order_by(-match__match_date')[:100]
    """
    I am totally out of ideas as to what I might do next though. 
    Tried various things like 'if exists', 'try except IndexError etc'. 
    Below was the last thing I tried which failed yet again.
    """

    s3_list = []
    while j < i:
        s3 = Set.objects.filter(match=match_list, set_number=3)[j]
        if s3:
            s3_list.append(s2)
        else:
            s3 = Set.objects.filter(set_ID=1)
            s3_list.append(s3)

    lst1 = match_list
    lst2 = result_list
    lst3 = s1_list
    ...
    lst5 = s3_list

    mandr = zip(lst1, lst2, lst3,... lst5)

    context_dict = {...}
    return render_to_response('stats/players.html', context_dict, context)

m_list = match_list
r_list = result_list

list1 = s1_list
list2 = s2_list
..............
list5 = s3_list

mandr = zip(m_list, r_list)
my_lists = zip(list1, list2, ..., lst5)

{% if matches %}
<ul>
    {% for match, team in mandr %}
    <li>{{ match.match_date }} <a href="/stats/match/{{ match.match_ID }}/">
    {{ match.hometeam }} vs. {{ match.awayteam }}</a> ( {{ team.result }} )</li>
    <li>{{ match.hometeam_sets }}:{{ match.awayteam_sets }} --
        {% for lst in my_lists %} 
            <li>{{ lst.hometeam_games }}</li>
        {% endfor %}
    {% endfor %}
</ul>
{% else %}
    <br/>
    <strong>There are currently no matches in the system - try again tomorrow!</strong>
{% endif %}

def播放器匹配（请求，播放器ID）：
context=RequestContext（请求）
p=获取对象或404（玩家，pk=玩家ID）
match_list=match.objects.filter（players=player_ID）。排序依据（'-match_date'）[：100]
i=len（匹配列表）
j=0
#这是因为所有测试赛都有第一组！
s1\u list=Set.objects.filter（match=match\u list，Set\u number=1）。排序依据（-match\u match\u date'）[：100]
"""
我完全不知道我下一步会做什么。
尝试了各种方法，如“如果存在”、“尝试除索引器之外的其他方法”等。
下面是我最后一次尝试，但再次失败。
"""
s3_列表=[]
而j

template.html

{% if matches %}
    <ul>
        {% for match, team, s1, s2 in mandr %}
        <li>{{ match.match_date }} <a href="/stats/match/{{ match.match_ID }}/">{{ match.hometeam }} vs. {{ match.awayteam }}</a> ( {{ team.result }} )</li>
        <li>{{ match.hometeam_sets }}:{{ match.awayteam_sets }} -- {{ s1.hometeam_games }}-{{ s1.awayteam_games }} {{ s3.hometeam_games }}-{{ s3.awayteam_games }}</li>
        {% endfor %}
    </ul>
{% else %}
    <br/>
    <strong>There are currently no matches in the system - try again tomorrow!</strong>
{% endif %}

{%if匹配%}

{%用于比赛，团队，s1，s2在mandr%}
{{match.match_date}}（{{team.result}}）
{match.hometeam\u sets}:{{match.awayteam\u sets}--{s1.hometeam\u games}-{s1.awayteam\u games}{{s3.hometeam\u games}-{s3.awayteam\u games}
{%endfor%}

{%else%}


系统中当前没有匹配项-请明天再试
{%endif%}

不要将匹配列表、结果列表与剩余列表混用。在视图中将它们作为单独的对象传递，并在模板中对它们进行迭代

按如下所示更改视图和模板

视图.py

class Match(models.Model):
    match_ID = models.AutoField(primary_key=True)
    match_date = models.DateField()
    players = models.ManyToManyField(Team, through='MatchStats', related_name='pim')
    hometeam = models.ForeignKey(Team, to_field='teamname', related_name='hometeam')
    awayteam = models.ForeignKey(Team, to_field='teamname', related_name='awayteam')
    hometeam_sets = models.IntegerField()
    awayteam_sets = models.IntegerField()

class Set(models.Model):
    set_ID = models.AutoField(primary_key=True)
    match = models.ForeignKey(Match)
    set_number = models.IntegerField()
    hometeam_games = models.IntegerField(default=0)
    awayteam_games = models.IntegerField(default=0)

def playermatches(request, player_ID):
    context = RequestContext(request)
    p = get_object_or_404(Player, pk=player_ID)
    match_list = Match.objects.filter(players=player_ID).order_by('-match_date')[:100]

    i = len(match_list)
    j = 0

    #This works as all test matches have a 1st set!
    s1_list = Set.objects.filter(match=match_list, set_number=1).order_by(-match__match_date')[:100]
    """
    I am totally out of ideas as to what I might do next though. 
    Tried various things like 'if exists', 'try except IndexError etc'. 
    Below was the last thing I tried which failed yet again.
    """

    s3_list = []
    while j < i:
        s3 = Set.objects.filter(match=match_list, set_number=3)[j]
        if s3:
            s3_list.append(s2)
        else:
            s3 = Set.objects.filter(set_ID=1)
            s3_list.append(s3)

    lst1 = match_list
    lst2 = result_list
    lst3 = s1_list
    ...
    lst5 = s3_list

    mandr = zip(lst1, lst2, lst3,... lst5)

    context_dict = {...}
    return render_to_response('stats/players.html', context_dict, context)

m_list = match_list
r_list = result_list

list1 = s1_list
list2 = s2_list
..............
list5 = s3_list

mandr = zip(m_list, r_list)
my_lists = zip(list1, list2, ..., lst5)

{% if matches %}
<ul>
    {% for match, team in mandr %}
    <li>{{ match.match_date }} <a href="/stats/match/{{ match.match_ID }}/">
    {{ match.hometeam }} vs. {{ match.awayteam }}</a> ( {{ team.result }} )</li>
    <li>{{ match.hometeam_sets }}:{{ match.awayteam_sets }} --
        {% for lst in my_lists %} 
            <li>{{ lst.hometeam_games }}</li>
        {% endfor %}
    {% endfor %}
</ul>
{% else %}
    <br/>
    <strong>There are currently no matches in the system - try again tomorrow!</strong>
{% endif %}

模板.py

class Match(models.Model):
    match_ID = models.AutoField(primary_key=True)
    match_date = models.DateField()
    players = models.ManyToManyField(Team, through='MatchStats', related_name='pim')
    hometeam = models.ForeignKey(Team, to_field='teamname', related_name='hometeam')
    awayteam = models.ForeignKey(Team, to_field='teamname', related_name='awayteam')
    hometeam_sets = models.IntegerField()
    awayteam_sets = models.IntegerField()

class Set(models.Model):
    set_ID = models.AutoField(primary_key=True)
    match = models.ForeignKey(Match)
    set_number = models.IntegerField()
    hometeam_games = models.IntegerField(default=0)
    awayteam_games = models.IntegerField(default=0)

def playermatches(request, player_ID):
    context = RequestContext(request)
    p = get_object_or_404(Player, pk=player_ID)
    match_list = Match.objects.filter(players=player_ID).order_by('-match_date')[:100]

    i = len(match_list)
    j = 0

    #This works as all test matches have a 1st set!
    s1_list = Set.objects.filter(match=match_list, set_number=1).order_by(-match__match_date')[:100]
    """
    I am totally out of ideas as to what I might do next though. 
    Tried various things like 'if exists', 'try except IndexError etc'. 
    Below was the last thing I tried which failed yet again.
    """

    s3_list = []
    while j < i:
        s3 = Set.objects.filter(match=match_list, set_number=3)[j]
        if s3:
            s3_list.append(s2)
        else:
            s3 = Set.objects.filter(set_ID=1)
            s3_list.append(s3)

    lst1 = match_list
    lst2 = result_list
    lst3 = s1_list
    ...
    lst5 = s3_list

    mandr = zip(lst1, lst2, lst3,... lst5)

    context_dict = {...}
    return render_to_response('stats/players.html', context_dict, context)

m_list = match_list
r_list = result_list

list1 = s1_list
list2 = s2_list
..............
list5 = s3_list

mandr = zip(m_list, r_list)
my_lists = zip(list1, list2, ..., lst5)

{% if matches %}
<ul>
    {% for match, team in mandr %}
    <li>{{ match.match_date }} <a href="/stats/match/{{ match.match_ID }}/">
    {{ match.hometeam }} vs. {{ match.awayteam }}</a> ( {{ team.result }} )</li>
    <li>{{ match.hometeam_sets }}:{{ match.awayteam_sets }} --
        {% for lst in my_lists %} 
            <li>{{ lst.hometeam_games }}</li>
        {% endfor %}
    {% endfor %}
</ul>
{% else %}
    <br/>
    <strong>There are currently no matches in the system - try again tomorrow!</strong>
{% endif %}

{%if匹配%}

{对于比赛，团队在mandr%}
{{match.match_date}}（{{team.result}}）
{{match.hometeam_set}}:{{match.awayteam_set}--
{我的_列表中的lst的%s%}
{{lst.hometeam_games}
{%endfor%}
{%endfor%}

{%else%}


系统中当前没有匹配项-请明天再试
{%endif%}

最后不需要太花哨的东西。意识到我需要通过外键查找每个匹配的相关集合。。。然后简单地迭代模板中的内容

{% for match in mandr %}
    {% for set in match.sets.all %}
        {{ set.hometeam_games }}:{{ set.awayteam_games }}
    {% endfor %}
{% endfor %}

---

非常感谢。不完全是我想要的，但帮助我看到我正朝着完全错误的方向努力。