Docker compose build error - Project file does not exist - docker

Question

I'm trying to create docker compose which run my ASP.NET Core app and mssql, but I'm getting an error during build.
Here's my docker compose file:
# Build Stage
FROM microsoft/aspnetcore-build:latest as build-env
WORKDIR /source
COPY . .
RUN dotnet restore ./Travelingowe.sln
RUN dotnet publish --output ${source:-obj/Docker/publish} --configuration Release
# Publish Stage
FROM microsoft/aspnetcore:latest
COPY --from=build-env ./obj/Docker/publish /app
WORKDIR /app
ENTRYPOINT ["dotnet", "Api.dll"]
when I run in CMD -> docker-compose up I'm getting:
Building api
Step 1/9 : FROM microsoft/aspnetcore-build:latest as build-env
---> d6273f7c44d4
Step 2/9 : WORKDIR /source
---> Using cache
---> 978f1c31e14a
Step 3/9 : COPY . .
---> Using cache
---> bcc750adcb99
Step 4/9 : RUN dotnet restore ./Travelingowe.sln
---> Running in 764199859de4
MSBUILD : error MSB1009: Project file does not exist.
Switch: ./Travelingowe.sln
ERROR: Service 'api' failed to build: The command '/bin/sh -c dotnet restore ./Travelingowe.sln' returned a non-zero code: 1
Do you have any ide what is wrong?
Thanks!
UPDATE:
My project files:

Answer 1

you have issues with your working directory try using absolute path instead of relative path in your working directory in docker file

Answer 2

TL;DR
Put your Dockerfile in your project root folder.
There are several question you need to think of:
Where is your Dockerfile?
How does docker-compose.yaml point to Dockerfile?
It seems like you put your Dockerfile in the other folder.
As document mentions:
Compose uses an alternate file to build with. A build path must also be specified.
When you use the Dockerfile on different folder with docker-compose.yaml you have to set up the context property.
As it set up, it will consider the Dockerfile's folder as project root folder. So when the command dotnet restore ./Travelingowe.sln executed, it shows you the error
You can manually test the command by running dotnet restore ./Travelingowe.sln in Dockerfile's folder. It should show the detail error message.