我想在item类中添加item类
我想在item类中添加item类
提问于 2019-01-18 14:07:48
最终的JSON将是：
"address": ----,
"state": ----,
year: {
"first": ----,
"second": {
"basic": ----,
"Information": ----,
}
},我想创建如下所示的items.py (仅举个例子)：
class Item(scrapy.Item):
address = scrapy.Field()
state = scrapy.Field()
year = scrapy.Field(first), scrapy.Field(second)
class first(scrapy.Item):
amounts = scrapy.Field()
class second(scrapy.Item):
basic = scrapy.Field()
information = scrapy.Field()如何实现这个，已经检查过这个https://doc.scrapy.org/en/latest/topics/items.html#extending-items了
how to implement nested item in scrapy?
但是关于这个概念没有任何线索。有什么建议吗？
回答 2
Stack Overflow用户
发布于 2019-01-18 19:58:13
class Item(scrapy.Item):
address = scrapy.Field()
state = scrapy.Field()
year = scrapy.Field(serializer=dict)
class Year(scrapy.Item):
first = scrapy.Field(serializer=dict)
second = scrapy.Field(serializer=dict)
class first(scrapy.Item):
amounts = scrapy.Field()
class second(scrapy.Item):
basic = scrapy.Field()
information = scrapy.Field()通过这种方式，您可以执行以下操作：
>>> b = second(basic="hello", information="hello world")
>>> a = first(amounts=3)
>>> year = Year(first=a, second=b)
>>> year
{'first': {'amounts': 3},
'second': {'basic': 'hello', 'information': 'hello world'}}
>>> item = Item(address='address value', state='state value', year=year)
>>> item
{'address': 'address value',
'state': 'state value',
'year': {'first': {'amounts': 3}, 'second': {'basic': 'hello', 'information': 'hello world'}}}Stack Overflow用户
发布于 2019-01-18 14:25:10
class Item(scrapy.Item):
address = scrapy.Field()
state = scrapy.Field()
year = scrapy.Field(first), scrapy.Field(second) #You dont need to do like this
class first(scrapy.Item):
amounts = scrapy.Field() #this work and below
class second(scrapy.Item): #and yes this work, you can do it in spider level or pipelines, just make your desired data, and pas it to year variable as you want. it will accumulate that
basic = scrapy.Field()
information = scrapy.Field()让我给你举个例子
first = {'first': first}
second = {'basic': basic, 'info': info}
year = {'first': first, 'second': second}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54248547
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