在我的模板中显示数据时，我使用下面的代码截断了字符。
{{list.report.incident_description|default:"No description available"|truncatechars:26}}
但是如果我使用"truncatewords:4"我没有收到错误
它给了我下面的 Traceback。
Template error:
In template /root/Projects/ir_uploaded_copy/ir_20-6/ir/templates/incident/index.html, error at line 22
Invalid filter: 'truncatechars'
12 : <p>Safety Committee</p><img src="{{ STATIC_URL }}images/safety_committee.png" width="20" height="21" alt="" />
13 : </span>
14 : <div id="report-list">
15 : <table class="lines" width="100%">
16 : <tr>
17 : <th>Filename</th>
18 : <th>Incident Description</th>
19 : <th id=action-needed colspan="4">Action needed</th>
20 : </tr>
21 : {% for list in report_list%}
22 : {% if list.firstaid_enabled or list.notification_enabled or list.followup_enabled or list.safty_notes_enabled %}
23 : <tr>
24 : <td class="irlist-num"><a href="{% url incident.views.edit_report list.report.id%}">{{list.report.incident_number}}{%if list.report.is_draft%} DRAFT{% endif %}</a> </td>
25 : <td class="irlist-desc">{{list.report.incident_description|default:"No description available"|truncatechars:26}} </td>
26 : <td class="actions">
27 : {%if list.firstaid_enabled%}
28 : <a href="{% url incident.views.edit_report list.report.id%}">
29 : <img src="{{ STATIC_URL }}images/{% if list.first_aid_needed%}firstaid.JPG{% else %}firstaid_tick.JPG {%endif%}" width="20" height="21" alt="" />
30 : </a> {%endif%}
31 : </td>
32 : <td class="actions">
Traceback:
File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
111. response = callback(request, *callback_args, **callback_kwargs)
File "/usr/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
23. return view_func(request, *args, **kwargs)
File "/root/Projects/ir_uploaded_copy/ir_20-6/ir/incident/views.py" in index
85. 'report_list': report_list
File "/usr/lib/python2.7/site-packages/django/shortcuts/__init__.py" in render
44. return HttpResponse(loader.render_to_string(*args, **kwargs),
File "/usr/lib/python2.7/site-packages/django/template/loader.py" in render_to_string
181. t = get_template(template_name)
File "/usr/lib/python2.7/site-packages/django/template/loader.py" in get_template
157. template, origin = find_template(template_name)
File "/usr/lib/python2.7/site-packages/django/template/loader.py" in find_template
134. source, display_name = loader(name, dirs)
File "/usr/lib/python2.7/site-packages/django/template/loader.py" in __call__
42. return self.load_template(template_name, template_dirs)
File "/usr/lib/python2.7/site-packages/django/template/loader.py" in load_template
48. template = get_template_from_string(source, origin, template_name)
File "/usr/lib/python2.7/site-packages/django/template/loader.py" in get_template_from_string
168. return Template(source, origin, name)
File "/usr/lib/python2.7/site-packages/django/template/base.py" in __init__
108. self.nodelist = compile_string(template_string, origin)
File "/usr/lib/python2.7/site-packages/django/template/base.py" in compile_string
136. return parser.parse()
File "/usr/lib/python2.7/site-packages/django/template/base.py" in parse
239. compiled_result = compile_func(self, token)
File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py" in do_extends
214. nodelist = parser.parse()
File "/usr/lib/python2.7/site-packages/django/template/base.py" in parse
239. compiled_result = compile_func(self, token)
File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py" in do_block
192. nodelist = parser.parse(('endblock', 'endblock %s' % block_name))
File "/usr/lib/python2.7/site-packages/django/template/base.py" in parse
239. compiled_result = compile_func(self, token)
File "/usr/lib/python2.7/site-packages/django/template/defaulttags.py" in do_for
787. nodelist_loop = parser.parse(('empty', 'endfor',))
File "/usr/lib/python2.7/site-packages/django/template/base.py" in parse
239. compiled_result = compile_func(self, token)
File "/usr/lib/python2.7/site-packages/django/template/defaulttags.py" in do_if
922. nodelist_true = parser.parse(('else', 'endif'))
File "/usr/lib/python2.7/site-packages/django/template/base.py" in parse
220. filter_expression = self.compile_filter(token.contents)
File "/usr/lib/python2.7/site-packages/django/template/base.py" in compile_filter
314. return FilterExpression(token, self)
File "/usr/lib/python2.7/site-packages/django/template/base.py" in __init__
497. filter_func = parser.find_filter(filter_name)
File "/usr/lib/python2.7/site-packages/django/template/base.py" in find_filter
320. raise TemplateSyntaxError("Invalid filter: '%s'" % filter_name)
Exception Type: TemplateSyntaxError at /member/
Exception Value: Invalid filter: 'truncatechars'