DeveloperControllerOData.cs

...
public class DeveloperController : ControllerBase
{
    ...

    [HttpGet]
    [Route("{id}")]
    // 4. Enable OData
    [EnableQuery()]
    public async Task<ActionResult<Developer>> Get(int id)
    {
        var developer = await _context.Developer.FindAsync(id);
        if (developer == null) return NotFound();
        return developer;
    }
    
    [HttpGet]
    // 4. Enable OData
    [EnableQuery()]
    public IEnumerable<Developer> Get() => _context.Developer.AsQueryable();

}