old_contents: from models import Achievement, Category, Trophies#, CollectionAchievement, Progress, ProgressAchievement, Task, TaskAchievement, TaskProgress, UserAchievement
  from django.contrib import admin
  from django.contrib.admin.widgets import FilteredSelectMultiple
  from django.db import models
  
  class CategoryAdmin(admin.ModelAdmin):
      list_display=['name', 'parent_category']
      search_fields = ('name', 'parent_category')
  
  class AchievementAdmin(admin.ModelAdmin):
      list_display=['name', 'description', 'category']
      search_fields = ('name', 'category')
  
  #class ProgressAchievementAdmin(admin.ModelAdmin):
      #list_display=['name', 'description', 'category']
      #search_fields = ('name', 'category')
  
  #class TaskAchievementAdmin(admin.ModelAdmin):
      #list_display=['name', 'description', 'category']
      #search_fields = ('name', 'category')
      #formfield_overrides = {
          #models.ManyToManyField: {'widget': FilteredSelectMultiple("tasks", False)}
      #}
  
  #class CollectionAchievementAdmin(admin.ModelAdmin):
      #list_display=['name', 'description', 'category']
      #search_fields = ('name', 'category')
      #formfield_overrides = {
          #models.ManyToManyField: {'widget': FilteredSelectMultiple("achievements", False)}
      #}
  
  #class TaskAdmin(admin.ModelAdmin):
      #list_display=['name', 'description']
  
  #class TaskProgressAdmin(admin.ModelAdmin):
      #list_display=['task_achievement', 'user']
      #formfield_overrides = {
          #models.ManyToManyField: {'widget': FilteredSelectMultiple("tasks", False)}
      #}
  
  class TrophiesAdmin(admin.ModelAdmin):
      list_display=['achievement', 'position']
  
  admin.site.register(Achievement, AchievementAdmin)
  admin.site.register(Category, CategoryAdmin)
  #admin.site.register(ProgressAchievement, ProgressAchievementAdmin)
  #admin.site.register(Progress)
  #admin.site.register(TaskAchievement, TaskAchievementAdmin)
  #admin.site.register(Task, TaskAdmin)
  #admin.site.register(TaskProgress, TaskProgressAdmin)
  admin.site.register(Trophies, TrophiesAdmin)
  #admin.site.register(UserAchievement)
  #admin.site.register(CollectionAchievement, CollectionAchievementAdmin)
new_contents: from models import Achievement, Category, Trophy#, CollectionAchievement, Progress, ProgressAchievement, Task, TaskAchievement, TaskProgress, UserAchievement
  from django.contrib import admin
  from django.contrib.admin.widgets import FilteredSelectMultiple
  from django.db import models
  
  class CategoryAdmin(admin.ModelAdmin):
      list_display=['name', 'parent_category']
      search_fields = ('name', 'parent_category')
  
  class AchievementAdmin(admin.ModelAdmin):
      list_display=['name', 'description', 'category']
      search_fields = ('name', 'category')
  
  #class ProgressAchievementAdmin(admin.ModelAdmin):
      #list_display=['name', 'description', 'category']
      #search_fields = ('name', 'category')
  
  #class TaskAchievementAdmin(admin.ModelAdmin):
      #list_display=['name', 'description', 'category']
      #search_fields = ('name', 'category')
      #formfield_overrides = {
          #models.ManyToManyField: {'widget': FilteredSelectMultiple("tasks", False)}
      #}
  
  #class CollectionAchievementAdmin(admin.ModelAdmin):
      #list_display=['name', 'description', 'category']
      #search_fields = ('name', 'category')
      #formfield_overrides = {
          #models.ManyToManyField: {'widget': FilteredSelectMultiple("achievements", False)}
      #}
  
  #class TaskAdmin(admin.ModelAdmin):
      #list_display=['name', 'description']
  
  #class TaskProgressAdmin(admin.ModelAdmin):
      #list_display=['task_achievement', 'user']
      #formfield_overrides = {
          #models.ManyToManyField: {'widget': FilteredSelectMultiple("tasks", False)}
      #}
  
  class TrophiesAdmin(admin.ModelAdmin):
      list_display=['achievement', 'position']
  
  admin.site.register(Achievement, AchievementAdmin)
  admin.site.register(Category, CategoryAdmin)
  #admin.site.register(ProgressAchievement, ProgressAchievementAdmin)
  #admin.site.register(Progress)
  #admin.site.register(TaskAchievement, TaskAchievementAdmin)
  #admin.site.register(Task, TaskAdmin)
  #admin.site.register(TaskProgress, TaskProgressAdmin)
  admin.site.register(Trophy, TrophiesAdmin)
  #admin.site.register(UserAchievement)
  #admin.site.register(CollectionAchievement, CollectionAchievementAdmin)
subject: change Trophies to Trophy