我正在创建一个简历应用程序，不知道我怎么能得到 我模板中模型的get_relative_length函数， 数据没有通过，我需要帮助，我是django的新手 我非常感谢你的帮助
模型
from __future__ import unicode_literals
#from django.db import models
# Create your models here.
from datetime import datetime
from dateutil import relativedelta
from django.db import models
from django.utils.translation import ugettext_lazy as _
#from djangocms_text_ckeditor.fields import HTMLField
class CreateCV(models.Model):
title = models.CharField(verbose_name=_('Title'), max_length=255)
company = models.CharField(verbose_name=_('Company'), max_length=255)
start_date = models.DateField(verbose_name=_('Start date'), help_text=_(
"The date when you started this position - only the month and year will be displayed"))
end_date = models.DateField(verbose_name=_('End date'), blank=True, null=True, help_text=_(
"The date when this position ended - only the month and year will be displayed. You don't have to define this if it is your active post."))
active_post = models.BooleanField(verbose_name=_("Active position?"), help_text=_(
"Check this if this is your active post. You won't have to add the end date in that case."))
description = models.TextField(verbose_name=_("Description"),
help_text=_("Give a short description about your work and responsibilities."),
max_length=2048,
null=True, blank=True)
website = models.CharField(verbose_name=_("Website"), help_text=_("Provide a link to the company's website."),
max_length=255, null=True, blank=True)
show_year = models.BooleanField(verbose_name=_("Show Year"), help_text=_('Displays how long the current position was held.'), default=False)
def __unicode__(self):
return self.title
def get_month_diff(self, d1, d2):
"""
Counting up the months from d1 (start date)
Until d2 (end date OR today) is reached.
Args:
d1: Start Date
d2: End date
Returns: Months
"""
delta = relativedelta.relativedelta(d2, d1)
months = (delta.years*12) + delta.months
return months
@property
def get_month_diff_string(self):
"""
Simple method to humanize the months from function
get_month_diff
Returns: diff_string
"""
if self.active_post:
d2 = datetime.now()
else:
d2 = self.end_date
month_diff = int(self.get_month_diff(self.start_date, d2))
if month_diff < 12:
diff_string = (str(month_diff) + ' ' + str(_('Months')))
if month_diff <= 1:
diff_string = (str(1) + ' ' + str(_('Month')))
else:
if month_diff % 12 == 0:
year_diff = str(month_diff/12)
else:
year_diff = str(round(float(month_diff)/12, 1))
print(year_diff)
diff_string = (year_diff + ' ' + str(_('Years')))
if year_diff == '1':
diff_string = (str(1) + ' ' + str(_('Year')))
return diff_string
@property
def get_relative_length(self):
"""
Method to get the relative length to
the longest length.
Everything below 18% gets up'd to 18% (design reasons)
Returns: length_percentage
"""
longest_post = self.get_longest_post()
if self.active_post:
end_date = datetime.now()
else:
end_date = self.end_date
relative_percentage = (float(self.get_month_diff(self.start_date, end_date)) / float(longest_post)) * 100
if relative_percentage <= 18:
length_percentage = 18
else:
length_percentage = relative_percentage
return int(length_percentage)
def get_longest_post(self):
"""
Get the post object with the longest duration
Returns: longest (amount of months)
"""
longest = 0
for post in Post.objects.all():
if post.active_post:
d2 = datetime.now()
else:
d2 = post.end_date
diff = self.get_month_diff(post.start_date, d2)
if diff > longest:
longest = diff
return longest
观点
# Create your views here.
from django.shortcuts import render
# Generics views
from django.views.generic import ListView, DetailView
# Models
from .models import CreateCV
class CreateCVListView(ListView):
model = CreateCV
template_name = 'cv/cv_list.html'
context_object_name = "cv_list"
模板
{% extends "base.html" %}
{% load i18n %}
{% block content %}
{% for cv in cv_list %}
<div class="position-entry"
id="position-{{ cv.pk }}">
<div class="position-duration {% if forloop.last %}last{% endif %} {% if forloop.first %}first{% endif %}">
<div class="duration-circle"
style="width: {{ instance.get_relative_length }}px;
height: {{ instance.get_relative_length }}px;
margin-left: -{% widthratio cv_list.get_relative_length 2 1 %}px;
margin-top: -{% widthratio cv_list.get_relative_length 2 1 %}px;
"></div>
{% if cv.get_relative_length > 18 %}
<div class="duration-label" style="{% if cv.show_year %}display: table-cell;{% endif %}">{{ cv.get_month_diff_string }}{{ cv.count }}</div>{% endif %}
</div>
<div class="position-block">
<div class="position-header">
<h2>{{ cv.title }}, </h2>
<h3><a href="{{ cv.website }}">{{ cv.company }}</a></h3>
</div>
<div class="position-meta">
<span class="entry-date">{{ cv.start_date }}</span>
{% if cv.active_post %}
<span class="until-now">{% trans ' until now.' %}</span>
{% else %}
<span class="end-date">{% trans ' until' %} {{ cv.end_date }}</span>
{% endif %}
</div>
<div class="position-content">
<span class="position-description">
{{ cv.description | safe }}
</span>
</div>
</div>
</div>
{% endfor %}
{% endblock content %}
答案 0 :(得分：1)
除了您在模板中没有任何名为instance的内容之外，您就像调用它一样调用它。你有一个for循环，它将每个元素分配给一个名为cv的变量，所以你应该使用它。
style="width: {{ cv.get_relative_length }}px;
height: {{ cv.get_relative_length }}px;
margin-left: -{% widthratio cv.get_relative_length 2 1 %}px;
margin-top: -{% widthratio cv.get_relative_length 2 1 %}px;
"
答案 1 :(得分：0)
模型
def get_longest_post(self):
"""
Get the post object with the longest duration
Returns: longest (amount of months)
"""
longest = 0
**for post in CreateCV.objects.all():**
if post.active_post:
d2 = datetime.now()
else:
d2 = post.end_date
diff = self.get_month_diff(post.start_date, d2)
if diff > longest:
longest = diff
return longest