details = "Exception calling application: 'BlogProtoSerializer' object has no attribute 'proto_class'"

[JonesThePotato]

I checked everything and followed every step of the document. Got as much as help from AIs too, no progress. I'll share any code if necessary.

[AMontagu]

You forgot to add one line in your serializers. See: https://djangogrpcframework.readthedocs.io/en/latest/quickstart.html#writing-serializers

For information this repo is no more maintained. If you are at the start of your projet considere looking at: https://github.com/socotecio/django-socio-grpc/

[JonesThePotato]

from django_grpc_framework.proto_serializers import ModelProtoSerializer
from django_grpc_framework import proto_serializers
from .models import Blog, Tag, Category, ImageModel
import blog_pb2 as blog_pb2 


class ImageModelProtoSerializer(proto_serializers.ModelProtoSerializer):
    class Meta:
        model = ImageModel
        proto_class = blog_pb2.ImageModel
        fields = ('id', 'content_photo',)
        read_only_fields = ('id',)


class TagProtoSerializer(proto_serializers.ModelProtoSerializer):
    class Meta:
        model = Tag
        proto_class = blog_pb2.Tag
        fields = ('id', 'title', 'description',)
        read_only_fields = ('id',)


class CategoryProtoSerializer(proto_serializers.ModelProtoSerializer):
    class Meta:
        model = Category
        proto_class = blog_pb2.Category
        fields = ('id', 'title', 'description', 'photo',)
        read_only_fields = ('id',)


class BlogProtoSerializer(proto_serializers.ModelProtoSerializer):
    image_models = ImageModelProtoSerializer(many=True, required=False)

    class Meta:
        model = Blog
        proto_class = blog_pb2.Blog
        fields = ('id', 'author', 'created_at', 'updated_at', 'tag', 'category', 'title', 'main_photo', 'content_photo', 'like', 'comment', 'image_models',)
        read_only_fields = ('id', 'created_at', 'updated_at', 'like', 'comment',)
        write_only_fields = ('main_photo',)

    def to_proto(self, instance):
        proto = self.proto_class(
            id=instance.id,
            author=instance.author,
            created_at=instance.created_at,
            updated_at=instance.updated_at,
            tag=instance.tag,
            category=instance.category,
            title=instance.title,
            main_photo=instance.main_photo,
            content_photo=instance.content_photo,
            like=instance.like,
            comment=instance.comment,
            image_models=[self.image_models.to_proto(image) for image in instance.image_models],
        )
        return proto

I checked. Everything is how it's supposed to be.

[AMontagu]

def to_proto(self, instance):
        proto = self.proto_class(
            id=instance.id,
            author=instance.author,
            created_at=instance.created_at,
            updated_at=instance.updated_at,
            tag=instance.tag,
            category=instance.category,
            title=instance.title,
            main_photo=instance.main_photo,
            content_photo=instance.content_photo,
            like=instance.like,
            comment=instance.comment,
            image_models=[self.image_models.to_proto(image) for image in instance.image_models],
        )
        return proto

You call self.proto_class but it should be self.Meta.proto_class.

[JonesThePotato]

Thank you for your insight. Now I am running into another error. No idea where to look at.
PS : Thank you so much for your responds! I have been stuck for few weeks.
Error : PS C:\Users\JonseThePotato\Documents\Work\microservices> py coresystem.py

1. List All Blogs
2. View a Blog
3. Create a Blog
4. Update a Blog
5. Delete a Blog
6. Quit
   Enter your choice (1-6): 1
   Traceback (most recent call last):
   File "C:\Users\JonseThePotato\Documents\Work\microservices\coresystem.py", line 99, in
   run()
   File "C:\Users\JonseThePotato\Documents\Work\microservices\coresystem.py", line 36, in run
   list_blogs(stub)
   File "C:\Users\JonseThePotato\Documents\Work\microservices\coresystem.py", line 52, in list_blogs
   response = stub.List(list_request)
   ^^^^^^^^^^^^^^^^^^^^^^^
   File "C:\Program Files\Python311\Lib\site-packages\grpc_channel.py", line 1030, in call
   return _end_unary_response_blocking(state, call, False, None)
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "C:\Program Files\Python311\Lib\site-packages\grpc_channel.py", line 910, in _end_unary_response_blocking
   raise _InactiveRpcError(state) # pytype: disable=not-instantiable
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
   status = StatusCode.UNKNOWN
   details = "Exception calling application: Message must be initialized with a dict: blog.Blog"
   debug_error_string = "UNKNOWN:Error received from peer {created_time:"2023-06-19T16:59:52.950338936+00:00", grpc_status:2, grpc_message:"Exception calling application: Message must be initialized with a dict: blog.Blog"}"

blog.proto :```
syntax = "proto3";

package blog;

import "google/protobuf/timestamp.proto";

message ImageModel {
string content_photo = 1;
}

message Tag {
int32 id = 1;
string title = 2;
string description = 3;
}

message Category {
int32 id = 1;
string title = 2;
string description = 3;
string photo = 4;
}

message Blog {
int32 id = 1;
string author = 2;
google.protobuf.Timestamp created_at = 3;
google.protobuf.Timestamp updated_at = 4;
Tag tag = 5;
Category category = 6;
string title = 7;
string main_photo = 8;
repeated ImageModel content_photo = 9;
int32 like = 10;
string comment = 11;
int32 category_id = 12;
int32 tag_id = 13;
}

// Request and Response messages for your gRPC service methods
message BlogListRequest {
// ...
}

message BlogListResponse {
repeated Blog blogs = 1;
}

// ... Add other request and response messages for Retrieve, Create, Update, and Delete methods

// Retrieve
message BlogRetrieveRequest {
int32 id = 1;
}

message BlogRetrieveResponse {
Blog blog = 1;
}

// Create
message BlogCreateRequest {
Blog blog = 1;
}

message BlogCreateResponse {
Blog blog = 1;
}

// Update
message BlogUpdateRequest {
int32 id = 1;
Blog blog = 2;
}

message BlogUpdateResponse {
Blog blog = 1;
}

// Delete
message BlogDeleteRequest {
int32 id = 1;
}

message BlogDeleteResponse {
bool success = 1;
}

service BlogService {
rpc List (BlogListRequest) returns (BlogListResponse);
rpc Retrieve (BlogRetrieveRequest) returns (BlogRetrieveResponse);
rpc Create (BlogCreateRequest) returns (BlogCreateResponse);
rpc Update (BlogUpdateRequest) returns (BlogUpdateResponse);
rpc Delete (BlogDeleteRequest) returns (BlogDeleteResponse);
}

services.py : ```
import grpc
import blog_pb2 as blog_pb2
import blog_pb2_grpc as blog_pb2_grpc
from django.shortcuts import get_object_or_404
from django_grpc_framework.services import Service
from blog.serializers import BlogProtoSerializer 
from .models import Blog


class BlogService(blog_pb2_grpc.BlogServiceServicer):
    def List(self, request, context):
        blogs = Blog.objects.all()
        serializer = BlogProtoSerializer()  # Instantiate the serializer
        blog_protos = [serializer.to_proto(blog) for blog in blogs]
        return blog_pb2.BlogListResponse(blogs=blog_protos)

    def Retrieve(self, request, context):
        blog = get_object_or_404(Blog, id=request.id)
        serializer = BlogProtoSerializer()  # Instantiate the serializer
        blog_proto = serializer.to_proto(blog)
        return blog_proto

    def Create(self, request, context):
        serializer = BlogProtoSerializer()  # Instantiate the serializer
        blog = serializer.create(request)
        blog.save()
        blog_proto = serializer.to_proto(blog)
        return blog_proto

    def Update(self, request, context):
        blog = get_object_or_404(Blog, id=request.id)
        serializer = BlogProtoSerializer()  # Instantiate the serializer
        updated_blog = serializer.update(blog, request)
        updated_blog.save()
        blog_proto = serializer.to_proto(updated_blog)
        return blog_proto

    def Delete(self, request, context):
        blog = get_object_or_404(Blog, id=request.id)
        blog.delete()
        return blog_pb2.Empty()

handlers.py : ```
from blog.services import BlogService
import blog_pb2_grpc

def grpc_handlers(server):
"""
Register the BlogService with the gRPC server.
"""
blog_pb2_grpc.add_BlogServiceServicer_to_server(BlogService(), server)

client.py : ```
import logging
import os
import sys
import grpc
import django
from django.conf import settings
from django.shortcuts import get_object_or_404
from django_grpc_framework.services import Service
sys.path.append('c:/Users/JonseThePotato/Documents/Work/MicroServices/BlogSystem/BlogSystem')
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'BlogSystem.settings')
django.setup()
from blog.serializers import BlogProtoSerializer
from blog.models import Blog
import blog_pb2_grpc
import blog_pb2

logging.basicConfig(level=logging.INFO)



def run():
    channel = grpc.insecure_channel('localhost:50051')
    stub = blog_pb2_grpc.BlogServiceStub(channel)

    while True:
        print("1. List All Blogs")
        print("2. View a Blog")
        print("3. Create a Blog")
        print("4. Update a Blog")
        print("5. Delete a Blog")
        print("6. Quit")

        choice = input("Enter your choice (1-6): ")
        
        if choice == '1':
            list_blogs(stub)
        elif choice == '2':
            retrieve_blog(stub)
        elif choice == '3':
            create_blog(stub)
        elif choice == '4':
            update_blog(stub)
        elif choice == '5':
            delete_blog(stub)
        elif choice == '6':
            break
        else:
            print("Invalid choice. Please try again.")

def list_blogs(stub):
    list_request = blog_pb2.BlogListRequest()
    response = stub.List(list_request)
    
    print("Blogs:")
    for blog in response.blogs:
        print(f"ID: {blog.id}, Title: {blog.title}, Content: {blog.content}")
    print()

def retrieve_blog(stub):
    blog_id = input("Enter the ID of the blog: ")
    retrieve_request = blog_pb2.BlogRetrieveRequest(id=int(blog_id))
    response = stub.Retrieve(retrieve_request)

    print(f"Blog - ID: {response.id}, Title: {response.title}, Content: {response.content}")
    print()

def create_blog(stub):
    title = input("Enter the title of the blog: ")
    content = input("Enter the content of the blog: ")
    blog = blog_pb2.Blog(title=title, main_photo=content)  
    create_request = blog_pb2.BlogCreateRequest(blog=blog)  
    response = stub.Create(create_request)

    print(f"Created Blog - ID: {response.blog.id}, Title: {response.blog.title}, Content: {response.blog.main_photo}")
    print()


def update_blog(stub):
    blog_id = input("Enter the ID of the blog to update: ")
    title = input("Enter the new title of the blog: ")
    content = input("Enter the new content of the blog: ")
    blog = blog_pb2.Blog(id=int(blog_id), title=title, main_photo=content)  
    update_request = blog_pb2.BlogUpdateRequest(id=int(blog_id), blog=blog)  
    response = stub.Update(update_request)

    print(f"Updated Blog - ID: {response.blog.id}, Title: {response.blog.title}, Content: {response.blog.main_photo}")
    print()


def delete_blog(stub):
    blog_id = input("Enter the ID of the blog to delete: ")
    delete_request = blog_pb2.BlogDeleteRequest(id=int(blog_id))
    response = stub.Delete(delete_request)

    print("Blog deleted successfully.")
    print()

if __name__ == '__main__':
    run()

[AMontagu]

As I said in my first message: For information this repo is no more maintained. If you are at the start of your projet considere looking at: https://github.com/socotecio/django-socio-grpc/

It look like you are doing a small school project.
Django is a web framework mostly used for website not CMD program.
Have you considered not using django and gRPC and just basic python to learn ? Or it it specific to learn gRPC ?

[JonesThePotato]

I just started working at a company and still learning. This is a small part I was trusted with. I was told to do what I am doing right now. I must use this framework.

[JonesThePotato]

I would really appreciate it if you could guide me through.