Fixed #10348: ChangeList no longer overwrites a select_related provided by `ModelAdmin.queryset()`.

            raise IncorrectLookupParameters

        # Use select_related() if one of the list_display options is a field

        # with a relationship.

        # with a relationship and the provided queryset doesn't already have

        # select_related defined.

        if not qs.query.select_related:

            if self.list_select_related:

                qs = qs.select_related()

            else:

from django.db import models

from django.contrib import admin

class Parent(models.Model):

    name = models.CharField(max_length=128)

class Child(models.Model):

    parent = models.ForeignKey(Parent, editable=False)

    name = models.CharField(max_length=30, blank=True)

 No newline at end of file

import unittest 

from django.contrib import admin

from django.contrib.admin.views.main import ChangeList

from regressiontests.admin_changelist.models import Child

class ChangeListTests(unittest.TestCase):

    def test_select_related_preserved(self):

        """

        Regression test for #10348: ChangeList.get_query_set() shouldn't

        overwrite a custom select_related provided by ModelAdmin.queryset().

        """

        m = ChildAdmin(Child, admin.site)

        cl = ChangeList(MockRequest(), Child, m.list_display, m.list_display_links, 

                m.list_filter,m.date_hierarchy, m.search_fields, 

                m.list_select_related, m.list_per_page, m.list_editable, m)

        self.assertEqual(cl.query_set.query.select_related, {'parent': {'name': {}}})

class ChildAdmin(admin.ModelAdmin):

    list_display = ['name', 'parent']

    def queryset(self, request):

        return super(ChildAdmin, self).queryset(request).select_related("parent__name")

class MockRequest(object):

    GET = {}