我想要运行此命令时遇到麻烦
python manage.py migrate
我得到错误...我试图搜索如何解决它但我没有找到如何解决，可能有人在这里可以帮我解决这个问题 这是我得到的错误
Operations to perform:
Apply all migrations: admin, rango, contenttypes, auth, sessions
Running migrations:
Applying rango.0004_auto_20160107_0149...Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/core/management/commands/migrate.py", line 161, in handle
executor.migrate(targets, plan, fake=options.get("fake", False))
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/migrations/executor.py", line 68, in migrate
self.apply_migration(migration, fake=fake)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/migrations/executor.py", line 102, in apply_migration
migration.apply(project_state, schema_editor)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/migrations/migration.py", line 108, in apply
operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/migrations/operations/fields.py", line 139, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/schema.py", line 470, in alter_field
self._alter_field(model, old_field, new_field, old_type, new_type, old_db_params, new_db_params, strict)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/sqlite3/schema.py", line 202, in _alter_field
self._remake_table(model, alter_fields=[(old_field, new_field)])
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/sqlite3/schema.py", line 146, in _remake_table
self.quote_name(model._meta.db_table),
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/schema.py", line 111, in execute
cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/utils.py", line 81, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/Django-1.7.11-py2.7.egg/django/db/backends/sqlite3/base.py", line 485, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: UNIQUE constraint failed: rango_page__new.category_id
这里是我的代码
views.py
from django.shortcuts import render
from django.http import HttpResponse
from rango.models import Category, Page
from django.db.models import F
from rango.forms import CategoryForm, PageForm
# Create your views here.
def index(request):
# return HttpResponse("Rango says: Hello world! <br /><a href='/rango/about/'>About</a>")
# context_dict = {'boldmessage':'I am bold font from the contextx'}
# return render(request, 'rango/index.html',context_dict)
category_list = Category.objects.order_by('-likes')
context_dict = {'categories':category_list}
return render(request, 'rango/index.html', context_dict)
def about(request):
return HttpResponse("Rango says here is the about page<br /><a href='/rango/'>Index</a>")
def category(request, category_name_slug):
context_dict = {}
try:
category = Category.objects.get(slug=category_name_slug)
context_dict['category_name'] = category.name
pages = Page.objects.filter(category=category)
context_dict['pages'] = pages
context_dict['category'] = category
# Category.objects.filter().update(views=F('views')+1)
except Category.DoesNotExist:
pass
return render(request, 'rango/category.html', context_dict)
def add_category(request):
if request.method == 'POST':
form = CategoryForm(request.POST)
if form.is_valid():
form.save(commit=True)
return index(request)
else:
print form.errors
else:
form = CategoryForm()
return render(request, 'rango/add_category.html', {'form':form})
def add_page(request, category_name_slug):
try:
cat = Category.objects.get(slug=category_name_slug)
except Category.DoesNotExist:
cat = None
if request.method == 'POST':
form = PageForm(request.POST)
if form.is_valid():
if cat:
page = form.save(commit=False)
page.category = cat
page.views = 0
page.save()
return category(request, category_name_slug)
else:
print form.errors
else:
form = PageForm()
context_dict = {'form':form, 'category':cat, 'category_name_slug':category_name_slug}
return render(request, 'rango/add_page.html', context_dict)
models.py
from django.db import models
from django.template.defaultfilters import slugify
# Create your models here.
class Category(models.Model):
name = models.CharField(max_length=128, unique=True)
views = models.IntegerField(default=0)
likes = models.IntegerField(default=0)
slug = models.SlugField(null=False)
def save(self, *args, **kwargs):
self.slug = slugify(self.name)
super(Category, self).save(*args, **kwargs)
def __unicode__(self):
return self.name
class Page(models.Model):
category = models.ForeignKey(Category)
title = models.CharField(max_length=128)
url = models.URLField(null=True)
views = models.IntegerField(default=0, null=True)
# def save(self, *args, **kwargs):
# self.slug = slugify(self.name)
# super(Category, self).save(*args, **kwargs)
def __unicode__(self): #For Python 2, use __str__ on Python 3
return self.title
forms.py
from django import forms
from rango.models import Page, Category
class CategoryForm(forms.ModelForm):
name = forms.CharField(max_length=128, help_text="Please enter the category name.")
views = forms.IntegerField(widget=forms.HiddenInput(), initial=0)
likes = forms.IntegerField(widget=forms.HiddenInput(), initial=0)
slug = forms.CharField(widget=forms.HiddenInput(), required=False)
# An inline class to provide additional information on the form.
class Meta:
# Provide an association between the ModelForm and a model
model = Category
fields = ('name',)
class PageForm(forms.ModelForm):
title = forms.CharField(max_length=128, help_text="Please enter the title of the page.")
url = forms.URLField(max_length=200, help_text="Please enter the URL of the page.")
views = forms.IntegerField(widget=forms.HiddenInput(), initial=0, required=False )
class Meta:
# Provide an association between the ModelForm and a model
model = Page
# What fields do we want to include in our form?
# This way we don't need every field in the model present.
# Some fields may allow NULL values, so we may not want to include them...
# Here, we are hiding the foreign key.
# we can either exclude the category field from the form,
exclude = ('category',)
#or specify the fields to include (i.e. not include the category field)
#fields = ('title', 'url', 'views')
我应该怎么做才能解决这个问题！
答案 0 :(得分：0)
好的，它只是编辑了这个脚本
兰戈/迁移/ 0004_auto_20160107_0149.py
旧
class Migration(migrations.Migration):
dependencies = [
('rango', '0003_category_slug'),
]
operations = [
migrations.AlterField(
model_name='page',
name='category',
field=models.ForeignKey(to='rango.Category', unique=True),
preserve_default=True,
),
是
class Migration(migrations.Migration):
dependencies = [
('rango', '0003_category_slug'),
]
operations = [
migrations.AlterField(
model_name='page',
name='category',
field=models.ForeignKey(to='rango.Category', unique=False),
preserve_default=True,
),
unique = True为unique = False
好的......