Question

Django模型

class Product(models.Model):
    product_name = models.CharField(max_length=50)
    category = models.CharField(max_length=50)
    desc = models.CharField(max_length=120)
    company_name = models.CharField(max_length=50, default=None)
    timestamp = models.DateTimeField(auto_now_add = True, auto_now = False)
    updated = models.DateTimeField(auto_now_add = False, auto_now = True)

    def __unicode__(self):
        return self.product_name


class ProductDetails(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    batch = models.CharField(max_length=50)
    quantity = models.IntegerField()
    cost = models.FloatField(null=True, blank=True, default=None)
    mfg = models.DateTimeField()
    exp = models.DateTimeField()
    timestamp = models.DateTimeField(auto_now_add = True, auto_now = False)
    updated = models.DateTimeField(auto_now_add = False, auto_now = True)

    def __unicode__(self):
        return self.batch


class product_barcode(models.Model):
    batch = models.ForeignKey(ProductDetails, on_delete=models.CASCADE)
    barcode = models.BigIntegerField()
    flag = models.IntegerField()

    timestamp = models.DateTimeField(auto_now_add = True, auto_now = False)
    updated = models.DateTimeField(auto_now_add = False, auto_now = True)

    def __unicode__(self):
        return self.barcode

我想计算company_name生成的条形码数量

我尝试了一些像

这样的代码

w=Product.objects.all().filter(company_name="company name")
print "w>>>",w
pid = []
for Pdata in w:
    pid.append(Pdata.id)
print "pid>>>",pid

在这里，我找到属于特定公司的产品名称ID，但之后我想查找属于产品ID的批次代码（在ProductDetails），之后我需要计算所有属于批次代码的条形码。< / p> 用简单的话说

公司[＆＃39;公司名称＆＃39;]
产品[＆＃39; product1＆＃39;，＆＃39; product2＆＃39;，＆＃39; product3＆＃39;]其中company =＆＃39;公司名称＆＃39;
批次代码，其中产品= [＆＃39;产品1＆＃39;，＆＃39;产品2＆＃39;，＆＃39;产品3＆＃39;]
- product1 [＆＃39; bxyz＆＃39;，＆＃39; b2xyz＆＃39;，＆＃39; b3xyz＆＃39;]
- product2 [＆＃39; b1xyz＆＃39;，＆＃39; b4xyz＆＃39;，＆＃39; b3xyz＆＃39;]
- product3 [＆＃39; b9xyz＆＃39;，＆＃39; b6xyz＆＃39;，＆＃39; b3xyz＆＃39;]
计算条形码的批次代码[＆＃39; bxyz＆＃39;，＆＃39; b2xyz＆＃39;，＆＃39; b3xyz＆＃39;] [＆＃39; b1xyz＆＃39;，＆＃39; b4xyz＆＃39;＆＃39; b3xyz＆＃39;] [＆＃39; b9xyz＆＃39;＆＃39; b6xyz＆＃39;＆＃39; b3xyz＆＃39;]
< / LI>

Answer 1

我希望，我很清楚你想做什么，比如：

def exe(self):
    browser = webdriver.Firefox()
    wait = WebDriverWait(browser, 15)
    yesterday = date.today() - timedelta(1)
    browser.get("https://ssp.vertamedia.com")

    try:
        userElement = wait.until(EC.visibility_of_element_located((By.ID,'textfield-1020-inputEl')))
        userElement.send_keys(self.cred.pop('User'))
        time.sleep(# insert seconds)
        wait.until(EC.visibility_of_element_located((By.ID,'button-1021-btnInnerEl'))).click()
        passElement = wait.until(EC.visibility_of_element_located((By.ID, 'textfield-1027-inputEl')))
        passElement.send_keys(self.cred.pop('Password'))
        time.sleep(# insert seconds5)
        wait.until(EC.visibility_of_element_located((By.ID,'button-1028'))).click()

    except TimeoutException:
        self.cred['Impression'] = "Login error"
        self.cred['Revenue'] = "Login error"
        self.cred['Date'] = yesterday.strftime('%m%d%y')

这应该返回公司名称等于＆＃39;公司名称＆＃39;的所有产品的条形码数量。

两个下划线用于连接表，例如在SQL中使用JOIN。根据{{3}}，您应该更改条形码类的名称（count = product_barcode.objects.filter(batch__product__company_name='company name').count()）。最好从未来开始。

django复杂查询相互依赖的表

1 个答案: