ProductDbContextDesignFactory.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;
using Pole.Domain.EntityframeworkCore.MediatR;
using Product.Api.Infrastructure;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace Product.Api
{
    public class ProductDbContextDesignFactory : IDesignTimeDbContextFactory<ProductDbContext>
    {
        public ProductDbContext CreateDbContext(string[] args)
        {
            IConfigurationRoot configuration = new ConfigurationBuilder()
             .SetBasePath(Directory.GetCurrentDirectory())
             .AddJsonFile("appsettings.Development.json")
             .Build();
            var optionsBuilder = new DbContextOptionsBuilder<ProductDbContext>()
                .UseNpgsql(configuration["postgres:main"]);

            return new ProductDbContext(optionsBuilder.Options);
        }
    }
}