小编asa*_*mat的帖子

items.py classes

import scrapy
from scrapy.item import Item, Field
import json


class Attributes(scrapy.Item):
    description = Field()
    pages=Field()
    author=Field()
class Vendor(scrapy.Item):
    title=Field()
    order_url=Field()

class bookItem(scrapy.Item):

    title = Field()
    url = Field()
    marketprice=Field()
    images=Field()
    price=Field()
    attributes=Field()
    vendor=Field()
    time_scraped=Field()

我的刮刀

items.py classes

import scrapy
from scrapy.item import Item, Field
import json


class Attributes(scrapy.Item):
    description = Field()
    pages=Field()
    author=Field()
class Vendor(scrapy.Item):
    title=Field()
    order_url=Field()

class bookItem(scrapy.Item):

    title = Field()
    url = Field()
    marketprice=Field()
    images=Field()
    price=Field()
    attributes=Field()
    vendor=Field()
    time_scraped=Field()

堆栈跟踪

from scrapy.contrib.spiders import CrawlSpider, Rule …

class CreateUsers < ActiveRecord::Migration
   def up
     create_table :users do |t|
        t.string "email", :unique=>true

我试图添加这个独特的选项,使这个电子邮件ID在rails模型中独一无二,但它没有工作,所以我如何才能使这个电子邮件ID独一无二？