prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Improve admin page
  - [x] Add custom Admin models with `list_display`, `display_filter` (for example, by network), `ordering` and `search_fields`: https://docs.djangoproject.com/en/3.2/ref/contrib/admin/
  - [x] Use admin decorator https://docs.djangoproject.com/en/3.2/ref/contrib/admin/#the-register-decorator
  
  </issue>
  <code>
  [start of src/safe_apps/admin.py]
  1 from django.contrib import admin
  2 
  3 from .models import SafeApp, Provider
  4 
  5 models = [SafeApp, Provider]
  6 admin.site.register(models)
  7
  [end of src/safe_apps/admin.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/src/safe_apps/admin.py b/src/safe_apps/admin.py
  --- a/src/safe_apps/admin.py
  +++ b/src/safe_apps/admin.py
  @@ -2,5 +2,34 @@
   
   from .models import SafeApp, Provider
   
  -models = [SafeApp, Provider]
  -admin.site.register(models)
  +
  +class NetworksFilter(admin.SimpleListFilter):
  +    title = 'Networks'
  +    parameter_name = 'networks'
  +
  +    def lookups(self, request, model_admin):
  +        values = SafeApp.objects.values_list('networks', flat=True)
  +        # lookups requires a tuple to be returned – (value, verbose value)
  +        networks = [(network, network) for networks in values for network in networks]
  +        networks = sorted(set(networks))
  +        return networks
  +
  +    def queryset(self, request, queryset):
  +        if value := self.value():
  +            queryset = queryset.filter(networks__contains=[value])
  +        return queryset
  +
  +
  +@admin.register(SafeApp)
  +class SafeAppAdmin(admin.ModelAdmin):
  +    list_display = ('name', 'url', 'networks')
  +    list_filter = (NetworksFilter,)
  +    search_fields = ('name', 'url')
  +    ordering = ('name',)
  +
  +
  +@admin.register(Provider)
  +class ProviderAdmin(admin.ModelAdmin):
  +    list_display = ('name', 'url')
  +    search_fields = ('name',)
  +    ordering = ('name',)
  
verification_info: {"golden_diff": "diff --git a/src/safe_apps/admin.py b/src/safe_apps/admin.py\n--- a/src/safe_apps/admin.py\n+++ b/src/safe_apps/admin.py\n@@ -2,5 +2,34 @@\n \n from .models import SafeApp, Provider\n \n-models = [SafeApp, Provider]\n-admin.site.register(models)\n+\n+class NetworksFilter(admin.SimpleListFilter):\n+    title = 'Networks'\n+    parameter_name = 'networks'\n+\n+    def lookups(self, request, model_admin):\n+        values = SafeApp.objects.values_list('networks', flat=True)\n+        # lookups requires a tuple to be returned \u2013 (value, verbose value)\n+        networks = [(network, network) for networks in values for network in networks]\n+        networks = sorted(set(networks))\n+        return networks\n+\n+    def queryset(self, request, queryset):\n+        if value := self.value():\n+            queryset = queryset.filter(networks__contains=[value])\n+        return queryset\n+\n+\n+@admin.register(SafeApp)\n+class SafeAppAdmin(admin.ModelAdmin):\n+    list_display = ('name', 'url', 'networks')\n+    list_filter = (NetworksFilter,)\n+    search_fields = ('name', 'url')\n+    ordering = ('name',)\n+\n+\n+@admin.register(Provider)\n+class ProviderAdmin(admin.ModelAdmin):\n+    list_display = ('name', 'url')\n+    search_fields = ('name',)\n+    ordering = ('name',)\n", "issue": "Improve admin page\n- [x] Add custom Admin models with `list_display`, `display_filter` (for example, by network), `ordering` and `search_fields`: https://docs.djangoproject.com/en/3.2/ref/contrib/admin/\r\n- [x] Use admin decorator https://docs.djangoproject.com/en/3.2/ref/contrib/admin/#the-register-decorator\n", "before_files": [{"content": "from django.contrib import admin\n\nfrom .models import SafeApp, Provider\n\nmodels = [SafeApp, Provider]\nadmin.site.register(models)\n", "path": "src/safe_apps/admin.py"}]}