Django admin TabularInline "502 Bad Gateway” nginx prematurely closed connection - django

Question

I have seen lot of discussion on this but nothing has helped. Below is the error I am getting
*9 upstream prematurely closed connection while reading response header from upstream
It is happening with my Django TabularInline admin view. Everything else working absolutely fine.
It is working if I do this change in TargetTabularInline,
fields = (‘reviewed’,)
I believe the issue is because Target model has person foreign key on some other table. Which is where it is getting time out. Please advise how can I solve this?
admin.py
class TargetTabularInline(admin.TabularInline):
model = Target
class VideoAdmin(admin.ModelAdmin):
inlines = [TargetTabularInline]
list_display = ['title', 'source', 'reviewed', 'category', 'sfw']
search_fields = ('title', 'category', 'source__name', 'reviewed', )
class Meta:
model = Video
admin.site.register(Video, VideoAdmin)
models.py
class Video(DFModel):
source = models.ForeignKey(Source, models.DO_NOTHING)
creator = models.ForeignKey(
Creator, models.DO_NOTHING, blank=True, null=True)
title = models.CharField(max_length=500)
views = models.IntegerField(blank=True, null=True)
likes = models.IntegerField(blank=True, null=True)
dislikes = models.IntegerField(blank=True, null=True)
tags = models.TextField(blank=True, null=True)
upload_date = models.DateTimeField(blank=True, null=True)
page_url = models.TextField(blank=True, null=True)
video_url = models.TextField(blank=True, null=True)
thumb_url = models.TextField(blank=True, null=True)
sfw = models.BooleanField(blank=True, null=True)
category = models.CharField(max_length=20, blank=True, null=True)
reviewed = models.TextField(blank=True, null=True)
severity = models.CharField(max_length=10, blank=True, null=True)
origin = models.CharField(max_length=20, blank=True, null=True)
organization_id = models.IntegerField(blank=True, null=True)
created_at = models.DateTimeField(auto_now_add=True, blank=True, null=True)
class Target(DFModel):
person = models.ForeignKey(
Person, models.DO_NOTHING, blank=True, null=True)
video = models.ForeignKey(
'Video', models.DO_NOTHING, blank=True, null=True)
reviewed = models.TextField(blank=True, null=True)
created_at = models.DateTimeField(auto_now_add=True, blank=True, null=True)
class Meta:
db_table = ‘target'

Answer 1

Your Person model (or Creator) might have too many entries, which the admin tries to load in the drop down menu when viewing a specific entry in the admin details page dashboard, which causes too much load on the server
You could add this to the VideoAdmin class
raw_id_fields = ("creator",)
# OR
readonly_fields = ('creator',)
https://docs.djangoproject.com/en/3.0/ref/contrib/admin/#django.contrib.admin.ModelAdmin.raw_id_fields
https://docs.djangoproject.com/en/3.0/ref/contrib/admin/#django.contrib.admin.ModelAdmin.readonly_fields
This won't load the whole creator table which will reduce the load on your server,
and the workers will be free to server other requests.
Add this to your Target admin also, if there are too many entries in the Person table.