我试图从s query_set获取唯一结果。
实施例。
ID | NOMBRE | CLASIFICACION
1 Escoba Limpieza
2 Trapeador Limpieza
3 Tornillo Herramienta
我想得到" Limpieza和Herramienta"只要。目前我正在" Limpieza,Limpieza和Herramineta"
my views.py:
class ItemListView(ListView):
model= Items
def get_context_data(self,**kwargs):
context = super(ItemListView, self).get_context_data(**kwargs)
context['clasificacion'] =Items.objects.order_by('nombre').distinct('clasificacion')
return context
my models.py
from django.db import models
# Create your models here.
class Items(models.Model):
nombre = models.CharField(max_length=250)
descripcion = models.CharField(max_length=250)
codigo_proveedor = models.CharField(max_length=250)
clasificacion = models.CharField(max_length=250)
c_minima = models.IntegerField()
c_actual = models.IntegerField()
proveedor = models.ForeignKey('Proveedores',on_delete=models.CASCADE)
active = models.BooleanField()
def __str__(self):
return self.nombre + ' ----- ' +
self.clasificacion + ' ----- ' +
str(self.c_actual)
class Proveedores(models.Model):
nombre = models.CharField(max_length=250)
telefono = models.CharField(max_length=250)
direccion1 = models.CharField(max_length=250)
direccion2 = models.CharField(max_length=250, null=True)
active = models.BooleanField()
def __str__(self):
return self.nombre
感谢您的帮助!
答案 0 :(得分:0)
context['clasificacion'] = Items.objects.order_by('clasificacion', 'nombre').distinct('clasificacion')
distinct()
必须与最左边的order_by()
匹配。因此,在distinct()
order_by()
的第一列// P12 certificate is placed in "assets" folder
AssetManager assets = Application.Context.Assets;
byte[] bytes;
using (StreamReader sr2 = new StreamReader(assets.Open("myCertificate.p12")))
{
using (var memstream = new MemoryStream())
{
sr2.BaseStream.CopyTo(memstream);
bytes = memstream.ToArray();
}
}
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://www.aidap.naimes.faa.gov/aidap/XmlNotamServlet");
X509Certificate2 clientCertificate = new X509Certificate2(bytes, "myPassword");
req.ClientCertificates.Add(clientCertificate);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
string postData = "uid=myUsername&password=myPassword&active=Y";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
req.ContentLength = byteArray.Length;
// **Next line triggers the Exception**
using (Stream dataStream = req.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
}
// Show the first 10 lines
using (StreamReader sr = new StreamReader(req.GetResponse().GetResponseStream()))
{
for (int i = 0; i < 10; i++)
Console.WriteLine(sr.ReadLine());
}
中使用的列可以使其正常工作。
答案 1 :(得分:0)
请问的回答是否正确,但我认为您希望先执行order_by()操作,以确保获得正确的结果。
image(x,y,data,...)
data(wrdl_simpl)
plot(wrld_simpl, add = TRUE)