Django 刮痧上的外键
我正在和scrapy做一个片段,我在django上的模型是:Django 刮痧上的外键,django,django-models,web-scraping,scrapy,scrape,Django,Django Models,Web Scraping,Scrapy,Scrape,我正在和scrapy做一个片段,我在django上的模型是: class Creative(models.Model): name = models.CharField(max_length=200) picture = models.CharField(max_length=200, null = True) class Project(models.Model): title = models.CharField(max_length=200) descri
class Creative(models.Model):
name = models.CharField(max_length=200)
picture = models.CharField(max_length=200, null = True)
class Project(models.Model):
title = models.CharField(max_length=200)
description = models.CharField(max_length=500, null = True)
creative = models.ForeignKey(Creative)
class Image(models.Model):
url = models.CharField(max_length=500)
project = models.ForeignKey(Project)
还有我的刮痧模型:
from scrapy.contrib.djangoitem import DjangoItem
from app.models import Project, Creative
class ProjectItems(DjangoItem):
django_model = Project
class CreativeItems(DjangoItem):
django_model = Creative
因此,当我保存时:
creative["name"] = hxs.select('//*[@id="owner"]/text()').extract()[0]
picture = hxs.select('//*[@id="owner-icon"]/a/img/@src').extract()
if len(picture)>0:
creative["picture"] = picture[0]
creative.save()
# Extract title and description of the project
project["title"] = hxs.select('//*[@id="project-title"]/text()').extract()[0]
description = hxs.select('//*[@class="project-description"]/text()').extract()
if len(description)>0:
project["description"] = description[0]
project["creative"] = creative
project.save()
我得到了一个错误:
Project.creative必须是“creative”实例
那么,我如何在scrapy上添加foreing键值呢?比如,将您的创意ID直接放在creative\u ID中,我认为应该可以:
project["creative_id"] = creative.id
它将指定外键,而不会因为缺少对象而打扰您(因为您处于一个不直接接触模型对象的粗糙环境中…。这可以通过将
creative.save()
的返回值指定给project['creative'处的值来完成
例如,在下面的示例中,我们使用djangoCreativeItem
变量将此信息传递给项目:
creative["name"] = hxs.select('//*[@id="owner"]/text()').extract()[0]
picture = hxs.select('//*[@id="owner-icon"]/a/img/@src').extract()
if len(picture)>0:
creative["picture"] = picture[0]
djangoCreativeItem = creative.save()
# Extract title and description of the project
project["title"] = hxs.select('//*[@id="project-title"]/text()').extract()[0]
description = hxs.select('//*[@class="project-description"]/text()').extract()
if len(description)>0:
project["description"] = description[0]
project["creative"] = djangoCreativeItem
project.save()
creative
是通过实例化creative
创建的吗?您能否包含错误的整个回溯?