回答編集履歴
2
回答を修正
answer
CHANGED
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@@ -40,15 +40,14 @@
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40
40
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@register.simple_tag
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41
41
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def ordered_items(items):
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42
42
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html = '<p>rank, language, votes</p>\n'
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43
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-
if
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43
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+
if len(items):
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44
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-
return mark_safe(html)
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45
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-
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44
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+
votes = items.first().votes
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46
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-
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45
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+
rank = 1
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47
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-
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46
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+
for item in items:
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48
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-
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47
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+
if votes != item.votes:
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49
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-
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48
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+
rank += 1
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50
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-
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49
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+
votes = item.votes
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51
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-
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50
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html += f'<p>{rank}, {esc(item.name)}, {item.votes}</p>\n'
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52
51
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return mark_safe(html)
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53
52
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```
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54
53
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1
回答を追加
answer
CHANGED
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@@ -12,4 +12,68 @@
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12
12
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{% for object in object_list %}
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13
13
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<p>{{ forloop.counter0|add:page_obj.start_index }}, {{ object }}</p>
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14
14
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{% endfor %}
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15
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+
```
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16
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+
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17
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+
テンプレートタグで実装する方法を下記に示します。
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18
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+
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19
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+
```python
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20
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+
# models.py
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21
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from django.db import models
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22
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23
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24
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class Item(models.Model):
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25
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name = models.CharField('名前', max_length=40)
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26
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votes = models.IntegerField('投票数', default=0)
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27
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class Meta:
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28
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ordering = ('-votes', 'name', )
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29
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def __str__(self):
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30
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+
return self.name
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31
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+
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32
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+
# templatetags/item_tags.py
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33
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+
from django import template
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34
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from django.utils.html import conditional_escape as esc
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35
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from django.utils.safestring import mark_safe
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36
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+
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37
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register = template.Library()
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38
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+
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39
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+
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40
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+
@register.simple_tag
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41
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def ordered_items(items):
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42
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+
html = '<p>rank, language, votes</p>\n'
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43
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if not len(items):
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44
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+
return mark_safe(html)
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45
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+
votes = items.first().votes
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46
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+
rank = 1
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47
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+
for item in items:
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48
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+
if votes != item.votes:
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49
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+
rank += 1
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50
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+
votes = item.votes
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51
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+
html += f'<p>{rank}, {esc(item.name)}, {item.votes}</p>\n'
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52
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+
return mark_safe(html)
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53
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+
```
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54
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+
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55
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+
```html
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56
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+
<!-- templates/item_list.html>
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57
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+
{% load item_tags %}
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58
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<html>
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59
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<head></head>
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60
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+
<body>
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61
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+
{% ordered_items object_list %}
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62
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</body>
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63
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+
</html>
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64
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+
<!-- 下記のようにレンダリングされます。
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65
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+
<html>
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66
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<head></head>
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67
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<body>
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68
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<p>rank, language, votes</p>
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69
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<p>1, python, 100</p>
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70
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+
<p>2, c, 90</p>
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71
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<p>3, c#, 80</p>
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72
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<p>3, c++, 80</p>
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73
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<p>4, rust, 60</p>
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74
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<p>5, php, 0</p>
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75
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<p>5, ruby, 0</p>
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76
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</body>
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77
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+
</html>
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78
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+
-->
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15
79
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```
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