I got problem about template rendering in django. It's show up when there is kind of integer comparison with '=='.
I have a view like ..
def mailtemplate_GetSchema(request, id=None):
if id == None:
svars = []
this_var = {}
this_var['s_id']=str(uuid4())
this_var['varname'] = f"varname_{this_var['s_id']}"
this_var['varlabel'] = f"varlabel_{this_var['s_id']}"
this_var['vartype'] = f"vartype_{this_var['s_id']}"
this_var['varformat'] = f"varformat_{this_var['_sid']}"
this_var['varname_value'] = ''
this_var['varlabel_value'] = ''
this_var['vartype_value'] = 1
this_var['varformat_value'] = ''
svars.append(this_var)
return render(request, 'mailtemplate_all.html', {'svars': svars})
try :
obj = MailTemplate.objects.get(pk=id)
schema = obj.schema
schema = json.loads(schema)
# it's a list of dictionary
vars = []
for s in schema:
this_var = {}
this_var['field_id']=str(uuid4())
this_var['varname'] = f"varname_{this_var['field_id']}"
this_var['varlabel'] = f"varlabel_{this_var['field_id']}"
this_var['vartype'] = f"vartype_{this_var['field_id']}"
this_var['varformat'] = f"varformat_{this_var['field_id']}"
this_var['varname_value'] = s.get('name','')
this_var['varlabel_value'] = s.get('label','')
this_var['vartype_value'] = s.get('type',1)
this_var['varformat_value'] = s.get('format',None)
if this_var['varformat_value'] == '':
this_var['varformat_value']=False
vars.append(this_var)
print(f'VARS:{vars}')
return render(request, 'mailtemplate_all.html', {'vars': vars})
except MailTemplate.DoesNotExist:
return HttpResponseNotFound()
the 'mailtemplate_all.html' is :
{% for v in vars%}
<div id={{ v.field_id }} >
<div >
<input type="text" name={{v.varname}} value={{ v.varname_value}} maxlength="20" >
</div>
<div >
<input type="text" name={{v.varlabel}} value={{ v.varlabel_value}} maxlength="20" >
</div>
<div >
<select name={{v.vartype}}>
{% if v.vartype_value==1 %}
<option value=1 selected>
{% else %}
<option value=1>
{% endif %}
Integer</option>
{% if v.vartype_value==2 %}
<option value=2 selected>
{% else %}
<option value=2>
{% endif %}
String</option>
{% if v.vartype_value==3 %}
<option value=3 selected>
{% else %}
<option value=3>
{% endif %}
Date</option>
</select>
</div>
<div >
<input type="text" name={{v.varformat}} {% if v.varformat_value %}value={{v.varformat_value}}{% endif %} maxlength="20" >
</div>
</div>
{% endfor %}
When the view called, I got error
[13/Jan/2023 08:23:12] "GET /static/admin/fonts/Roboto-Bold-webfont.woff HTTP/1.1" 200 86184
VARS:[{'field_id': 'ac9a3707-3906-4e75-9efd-514959056ddb', 'varname': 'varname_ac9a3707-3906-4e75-9efd-514959056ddb', 'varlabel': 'varlabel_ac9a3707-3906-4e75-9efd-514959056ddb', 'vartype': 'vartype_ac9a3707-3906-4e75-9efd-514959056ddb', 'varformat': 'varformat_ac9a3707-3906-4e75-9efd-514959056ddb', 'varname_value': 'kepada', 'varlabel_value': 'Kepada', 'vartype_value': 2, 'varformat_value': False}]
Internal Server Error: /mst/htmx/get_schema/2
Traceback (most recent call last):
File "/home/bino/.venv/htmx01/lib/python3.10/site-packages/django/template/smartif.py", line 179, in translate_token
op = OPERATORS[token]
KeyError: 'v.vartype_value==1'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/bino/.venv/htmx01/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55, in inner
response = get_response(request)
File "/home/bino/.venv/htmx01/lib/python3.10/site-packages/django/core/handlers/base.py", line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/bino/Documents/dynform/htmx01/myapp/views.py", line 48, in mailtemplate_GetSchema
return render(request, 'mailtemplate_all.html', {'vars': vars})
...
File "/home/bino/.venv/htmx01/lib/python3.10/site-packages/django/template/smartif.py", line 181, in translate_token
return self.create_var(token)
File "/home/bino/.venv/htmx01/lib/python3.10/site-packages/django/template/defaulttags.py", line 889, in create_var
return TemplateLiteral(self.template_parser.compile_filter(value), value)
File "/home/bino/.venv/htmx01/lib/python3.10/site-packages/django/template/base.py", line 600, in compile_filter
return FilterExpression(token, self)
File "/home/bino/.venv/htmx01/lib/python3.10/site-packages/django/template/base.py", line 703, in __init__
raise TemplateSyntaxError(
django.template.exceptions.TemplateSyntaxError: Could not parse the remainder: '==1' from 'v.vartype_value==1'
[13/Jan/2023 08:23:12] "GET /mst/htmx/get_schema/2 HTTP/1.1" 500 200297
Not Found: /favicon.ico
[13/Jan/2023 08:23:12] "GET /favicon.ico HTTP/1.1" 404 2212
So I take the 'vars' printed out from my views, and use it to test from python shell
(htmx01) bino@corobalap ~/Documents/dynform/htmx01 python3
Python 3.10.6 (main, Nov 14 2022, 16:10:14) [GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from jinja2 import Template
>>> vars=[{'field_id': 'ac9a3707-3906-4e75-9efd-514959056ddb', 'varname': 'varname_ac9a3707-3906-4e75-9efd-514959056ddb', 'varlabel': 'varlabel_ac9a3707-3906-4e75-9efd-514959056ddb', 'vartype': 'vartype_ac9a3707-3906-4e75-9efd-514959056ddb', 'varformat': 'varformat_ac9a3707-3906-4e75-9efd-514959056ddb', 'varname_value': 'kepada', 'varlabel_value': 'Kepada', 'vartype_value': 2, 'varformat_value': False}]
>>> with open('myapp/templates/mailtemplate_all.html','r') as tfile:
... template = Template(tfile.read())
...
>>> o=template.render(vars=vars)
>>> print(o)
<div id=ac9a3707-3906-4e75-9efd-514959056ddb >
<div >
<input type="text" name=varname_ac9a3707-3906-4e75-9efd-514959056ddb value=kepada maxlength="20" >
</div>
<div >
<input type="text" name=varlabel_ac9a3707-3906-4e75-9efd-514959056ddb value=Kepada maxlength="20" >
</div>
<div >
<select name=vartype_ac9a3707-3906-4e75-9efd-514959056ddb>
<option value=1>
Integer</option>
<option value=2 selected>
String</option>
<option value=3>
Date</option>
</select>
</div>
<div >
<input type="text" name=varformat_ac9a3707-3906-4e75-9efd-514959056ddb maxlength="20" >
</div>
</div>
>>>
>>>
got no error, and the output just like expected. It's show there is no problem in jinja2 about integer comparison.
Kindly please tell me whats wrong with my views.py.
sincerely
-bino-
CodePudding user response：
Try this instead:
{% if v.vartype_value == 1 %}
<option value=1 selected>
{% else %}
<option value=1>
{% endif %}
Use it like v.vartype_value == 1, do proper spacing.
CodePudding user response：
This worked for me,
{% if v.vartype_value == 1 %}
add spacess in between the condition