我需要将另一个集合中的字段设置为我的猫鼬模式的外键。
我有一个using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using BlalaProject.Areas.Identity;
using BlalaProject.Data;
using BlalaProject.Controllers;
namespace BlalaProject
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(
Configuration.GetConnectionString("DefaultConnection")));
services.AddDefaultIdentity<IdentityUser>().AddEntityFrameworkStores<ApplicationDbContext>();
services.AddRazorPages();
services.AddServerSideBlazor();
services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<IdentityUser>>();
services.AddSingleton<WeatherForecastService>();
services.AddSingleton<FooController>();
services.AddSingleton<BarController>();
services.AddSingleton<BaaController>();
services.AddSingleton<FuuController>();
services.AddSingleton<FuzController>();
services.AddSingleton<FzuController>();
services.AddSingleton<BaaaController>();
services.AddSingleton<FoobarController>();
services.AddSingleton<BarFooController>();
services.AddSingleton<BaaFuuuController>();
services.AddSingleton<BaFooBaController>();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseDatabaseErrorPage();
}
else
{
app.UseExceptionHandler("/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
endpoints.MapBlazorHub();
endpoints.MapFallbackToPage("/_Host");
});
}
}
}
到pid的计数器。我需要将productSchema设置为pid的外键
orderSchema答案 0 :(得分：0)
MongoDB不是关系数据库，因此它不支持外键之类的概念。在mongoDB中，您必须以一种可以轻松获取信息的方式来构造数据。
您应该查看是否可以使用Aggregation之类的东西，但是mongoDB没有外键。更重要的是，在创建数据库时应做出正确的选择，应根据需要选择合适的数据库。