feat(clients): add clients app basic structure and endpoints

apps/clients/admin.py

@@ -0,0 +1,28 @@
+from django.contrib import admin
+
+from core.admins.base import BaseAdmin, SoftDeleteListFilter
+from apps.clients.models import Client
+
+
+@admin.register(Client)
+class ClientAdmin(BaseAdmin):
+    list_display = (
+        "id",
+        "name",
+        "workspace",
+        "created_at",
+        "updated_at",
+        "is_deleted",
+    )
+
+    list_filter = (
+        SoftDeleteListFilter,
+        "workspace",
+    )
+
+    search_fields = (
+        "name",
+        "workspace__name",
+    )
+
+    autocomplete_fields = ("workspace",)

apps/clients/api/permissions.py

@@ -0,0 +1,22 @@
+from rest_framework import permissions
+from apps.workspaces.models import WorkspaceMembership
+
+
+class IsClientWorkspaceMember(permissions.BasePermission):
+    """
+    Allows access only to users who are active members of the workspace associated with the client.
+    """
+    message = "شما عضو فضای کاری این مشتری نیستید."
+
+    def has_object_permission(self, request, view, obj):
+        """
+        Validates if the user exists in the workspace memberships for the requested client's workspace.
+        """
+        if not request.user.is_authenticated:
+            return False
+            
+        return WorkspaceMembership.objects.filter(
+            workspace=obj.workspace,
+            user=request.user,
+            is_active=True
+        ).exists()

apps/clients/api/serializers.py

@@ -0,0 +1,34 @@
+from rest_framework import serializers
+from apps.clients.models import Client
+from core.serializers.base import BaseModelSerializer
+
+
+class ClientSerializer(BaseModelSerializer):
+    """
+    Serializer for retrieving and representing client details.
+    """
+    class Meta:
+        model = Client
+        fields = BaseModelSerializer.Meta.fields + (
+            "workspace",
+            "name",
+            "notes",
+        )
+        read_only_fields = fields
+
+
+class ClientCreateSerializer(serializers.Serializer):
+    """
+    Serializer for handling input data during client creation.
+    """
+    workspace_id = serializers.UUIDField()
+    name = serializers.CharField(max_length=255)
+    notes = serializers.CharField(allow_blank=True, required=False, default="")
+
+
+class ClientUpdateSerializer(serializers.Serializer):
+    """
+    Serializer for handling input data during client updates.
+    """
+    name = serializers.CharField(max_length=255, required=False)
+    notes = serializers.CharField(allow_blank=True, required=False)

apps/clients/api/urls.py

@@ -0,0 +1,12 @@
+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+
+from apps.clients.api.views import ClientViewSet
+
+
+router = DefaultRouter()
+router.register(r"clients", ClientViewSet, basename="client")
+
+urlpatterns = [
+    path("", include(router.urls)),
+]

apps/clients/api/views.py

@@ -0,0 +1,98 @@
+from rest_framework import status
+from rest_framework.viewsets import ModelViewSet
+from rest_framework.response import Response
+from rest_framework.permissions import IsAuthenticated
+from rest_framework.filters import SearchFilter, OrderingFilter
+from django_filters.rest_framework import DjangoFilterBackend
+
+from core.paginations.limit_offset import CustomLimitOffsetPagination
+
+from apps.clients.models import Client
+from apps.clients.api.serializers import (
+    ClientSerializer,
+    ClientCreateSerializer,
+    ClientUpdateSerializer
+)
+from apps.clients.api.permissions import IsClientWorkspaceMember
+from apps.clients.services.clients import create_client, update_client
+
+
+class ClientViewSet(ModelViewSet):
+    """
+    API endpoints for managing clients within workspaces.
+    """
+    permission_classes = [IsAuthenticated, IsClientWorkspaceMember]
+    pagination_class = CustomLimitOffsetPagination
+    filter_backends = [DjangoFilterBackend, SearchFilter, OrderingFilter]
+    filterset_fields = ("workspace", )
+    search_fields = ("name", "notes")
+    ordering_fields = ("name", "created_at", "updated_at")
+    ordering = ("-updated_at", "-created_at")
+    
+    def get_queryset(self):
+        """
+        Returns active clients belonging to workspaces where the current user is an active member.
+        """
+        if getattr(self, "swagger_fake_view", False) or not self.request.user.is_authenticated:
+            return Client.objects.none()
+
+        return Client.objects.filter(
+            workspace__memberships__user=self.request.user,
+            workspace__memberships__is_active=True,
+            is_deleted=False
+        ).distinct()
+
+    def get_serializer_class(self):
+        """
+        Selects the appropriate serializer based on the request action.
+        """
+        if self.action == "create":
+            return ClientCreateSerializer
+        elif self.action in ["update", "partial_update"]:
+            return ClientUpdateSerializer
+        return ClientSerializer
+
+    def create(self, request, *args, **kwargs):
+        """
+        Creates a new client using the client service.
+        """
+        serializer = self.get_serializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        
+        client = create_client(
+            user=request.user,
+            workspace_id=serializer.validated_data["workspace_id"],
+            name=serializer.validated_data["name"],
+            notes=serializer.validated_data.get("notes", "")
+        )
+        
+        output_serializer = ClientSerializer(client)
+        return Response(output_serializer.data, status=status.HTTP_201_CREATED)
+
+    def update(self, request, *args, **kwargs):
+        """
+        Updates an existing client using the client service.
+        """
+        partial = kwargs.pop("partial", False)
+        client = self.get_object()
+        
+        serializer = self.get_serializer(data=request.data, partial=partial)
+        serializer.is_valid(raise_exception=True)
+        
+        updated_client = update_client(
+            client=client,
+            name=serializer.validated_data.get("name"),
+            notes=serializer.validated_data.get("notes")
+        )
+        
+        output_serializer = ClientSerializer(updated_client)
+        return Response(output_serializer.data, status=status.HTTP_200_OK)
+
+    def destroy(self, request, *args, **kwargs):
+        """
+        Soft deletes a client.
+        """
+        client = self.get_object()
+        client.is_deleted = True
+        client.save(update_fields=["is_deleted", "updated_at"])
+        return Response(status=status.HTTP_204_NO_CONTENT)

apps/clients/apps.py

@@ -0,0 +1,7 @@
+from django.apps import AppConfig
+
+
+class ClientsConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "apps.clients"
+    verbose_name = "Clients"

apps/clients/models.py

@@ -0,0 +1,34 @@
+from django.db import models
+from apps.workspaces.models import Workspace
+
+from core.models.base import BaseModel
+
+
+class Client(BaseModel):
+    workspace = models.ForeignKey(
+        Workspace,
+        on_delete=models.CASCADE,
+        related_name="clients",
+    )
+
+    name = models.CharField(max_length=255)
+
+    notes = models.TextField(blank=True)
+
+    class Meta:
+        db_table = "client"
+        ordering = ("-updated_at", "-created_at")
+        indexes = [
+            models.Index(fields=["id"], name="client_id_idx"),
+            models.Index(fields=["workspace"], name="client_workspace_idx"),
+        ]
+        constraints = [
+            models.UniqueConstraint(
+                fields=["workspace", "name"],
+                name="unique_client_name_per_workspace",
+                condition=models.Q(is_deleted=False),
+            )
+        ]
+
+    def __str__(self):
+        return self.name

apps/clients/services/clients.py

@@ -0,0 +1,42 @@
+from rest_framework.exceptions import ValidationError
+from apps.clients.models import Client
+from apps.workspaces.models import WorkspaceMembership
+
+
+def create_client(user, workspace_id, name, notes=""):
+    """
+    Creates a new client after validating workspace membership and name uniqueness.
+    """
+    is_workspace_member = WorkspaceMembership.objects.filter(
+        workspace_id=workspace_id,
+        user=user,
+        is_active=True
+    ).exists()
+    
+    if not is_workspace_member:
+        raise ValidationError({"workspace": "شما عضو این فضای کاری نیستید."})
+
+    if Client.objects.filter(workspace_id=workspace_id, name=name, is_deleted=False).exists():
+        raise ValidationError({"name": "مشتری با این نام در این فضای کاری وجود دارد."})
+
+    return Client.objects.create(
+        workspace_id=workspace_id,
+        name=name,
+        notes=notes
+    )
+
+
+def update_client(client, name=None, notes=None):
+    """
+    Updates an existing client while validating name uniqueness within the workspace.
+    """
+    if name is not None and name != client.name:
+        if Client.objects.filter(workspace_id=client.workspace_id, name=name, is_deleted=False).exists():
+            raise ValidationError({"name": "مشتری با این نام در این فضای کاری وجود دارد."})
+        client.name = name
+
+    if notes is not None:
+        client.notes = notes
+
+    client.save(update_fields=["name", "notes", "updated_at"])
+    return client