azure - 如何通过 Entity Framework 核心代码优先方法从 cosmosdb 集合中设置分区键？

Question

公共(public)类 TaxahandDbContext :DbContext { 公共(public) TaxahandDbContext(DbContextOptions 选项):基(选项) { 数据库.EnsureCreated(); }

    protected TaxathandDbContext()
    {
        Database.EnsureCreated();
    }

    public DbSet<Address> Address { get; set; }


    protected override void OnModelCreating(ModelBuilder modelBuilder)
            {                    
                OneCollectionPerDbSet(modelBuilder);
            }

    private void OneCollectionPerDbSet(ModelBuilder modelBuilder)
    {
        var dbSets = typeof(TaxathandDbContext).GetProperties(BindingFlags.Public | BindingFlags.Instance)
            .Where(p => p.PropertyType.IsGenericType && typeof(DbSet<>).IsAssignableFrom(p.PropertyType.GetGenericTypeDefinition()));
        foreach (var dbSet in dbSets)
        {`enter code here`
            var metadata = modelBuilder.Entity(dbSet.PropertyType.GetGenericArguments()[0]).Metadata;
            metadata.Cosmos().ContainerName = dbSet.Name;
        }
    }
}

Answer 1

根据 Microsoft documentation这很简单。需要注意的一件重要事情:您的分区键必须是字符串或 converted串起来!

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
        modelBuilder.Entity<TodoItem>()
            .HasPartitionKey(o => o.Id);
}