实体框架- BreezeJs:从更改的BreezeController更新到新的元数据

Question

我已经更改并添加了一些属性到我的服务器端类，但无法在我的breeze/angular应用程序中获得更新的数据。添加的字段保持空白而不是显示值。我也不能创建我添加的实体。(错误)。我如何更新元数据在我的微风/角应用程序使用最新版本?我试图获取元数据，但得到的消息是它已经被获取。

Breeze: Unable to locate a 'Type' by the name: 'New Class'. Be sure to execute a query or call fetchMetadata first

Update (More Info)

---

我已经创建了一个与Product类相关的子类。它被称为ProductStockItem，所以一个Product有很多ProductStockItem。

ProductStockItem:(新类)

public class ProductStockItem
{

    public int Id { get; set; }
    public int ProductId { get; set; }
    public string Size { get; set; }
    public int Quantity { get; set; }
    public bool UseStockQuantity { get; set; }
    public decimal PriceAdjustment { get; set; }
    public DateTime? DateAvailable { get; set; }
    public int DisplayOrder { get; set; }
    public bool Deleted { get; set; }
    public State State { get; set; }
    public DateTime? DateChanged { get; set; }
    public DateTime? DateCreated { get; set; }      
    public virtual Product Product { get; set; }
}

产品:

public class Product
{    
    private ICollection<ProductCategory> _productCategories;
    private ICollection<ProductManufacturer> _productManufacturers;
    private ICollection<ProductPicture> _productPictures;
    private ICollection<ProductSpecificationAttribute> _productSpecificationAttributes;
    private ICollection<ProductStockItem> _productStockItems; 
    public int Id { get; set; }
    public ProductType ProductType { get; set; }
    public int ParentGroupedProductId { get; set; }
    public int ManufacturerSizeId { get; set; }
    public bool VisibleIndividually { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public string MetaTitle { get; set; }
    public string MetaDescription { get; set; }
    public int DisplayOrder { get; set; }
    public bool LimitedToStores { get; set; }
    public string Sku { get; set; }
    public string UniqueCode { get; set; }
    public decimal Price { get; set; }
    public decimal OldPrice { get; set; }
    public decimal? SpecialPrice { get; set; }
    public DateTime? SpecialPriceStartDateTimeUtc { get; set; }
    public DateTime? SpecialPriceEndDateTimeUtc { get; set; }
    public decimal DiscountPercentage { get; set; }
    public bool HasTierPrices { get; set; }
    public bool HasStock { get; set; }
    public TaxRate TaxRate { get; set; }
    public bool SyncToShop { get; set; }
    public bool Deleted { get; set; }
    public bool Locked { get; set; }
    public State State { get; set; }
    public DateTime? DateChanged { get; set; }
    public DateTime? DateCreated { get; set; }
    public virtual ICollection<ProductCategory> ProductCategories
    {
        get { return _productCategories ?? (_productCategories = new List<ProductCategory>()); }
        protected set { _productCategories = value; }
    }
    public virtual ICollection<ProductManufacturer> ProductManufacturers
    {
        get { return _productManufacturers ?? (_productManufacturers = new List<ProductManufacturer>()); }
        protected set { _productManufacturers = value; }
    }
    public virtual ICollection<ProductPicture> ProductPictures
    {
        get { return _productPictures ?? (_productPictures = new List<ProductPicture>()); }
        protected set { _productPictures = value; }
    }
    public virtual ICollection<ProductSpecificationAttribute> ProductSpecificationAttributes
    {
        get { return _productSpecificationAttributes ?? (_productSpecificationAttributes = new List<ProductSpecificationAttribute>()); }
        protected set { _productSpecificationAttributes = value; }
    }
    public virtual ICollection<ProductStockItem> ProductStockItems
    {
        get { return _productStockItems ?? (_productStockItems = new List<ProductStockItem>()); }
        protected set { _productStockItems = value; }
    }
 }

产品要求:

http://testdomain.local/breeze/DataContext/Products?$filter=Id%20eq%201029&$orderby=Id&$expand=ProductStockItems&
[{"$id":"1","$type":"Erp.Models.ErpModel.Catalog.Product, Erp.Models.ErpModel","Id":1029,"ProductType":"SimpleProduct","ParentGroupedProductId":0,"ManufacturerSizeId":2767,"VisibleIndividually":false,"Name":"Jako Ballenzak Kids - Ash / Action Green","ExtraName":null,"Description":"• Aangenaam functioneel materiaalnmet moderne oppervlaktestructuurnvoor de hoogste normenn• Zeer goede klimaateigenschappenndoor actief ademend Twill-Polyestern• Rekbaar, vormvast en sneldrogendnnPolyester-Twilln100% Polyester,nbinnenvoering: 100% Polyester","MetaTitle":null,"MetaDescription":null,"DisplayOrder":1,"LimitedToStores":false,"Sku":"9894","UniqueCode":"6_9","Price":34.96,"OldPrice":49.95,"SpecialPrice":null,"SpecialPriceStartDateTime":null,"SpecialPriceEndDateTime":null,"DiscountPercentage":0.00,"HasTierPrices":true,"HasStock":false,"TaxRate":"Tax_21","SyncToShop":true,"Deleted":false,"Locked":false,"State":"Changed","DateChanged":"2014-02-28T10:35:47.733","DateCreated":"2014-02-28T10:35:47.733","ProductCategories":[],"ProductManufacturers":[],"ProductPictures":[],"ProductSpecificationAttributes":[],"ProductStockItems":[]}]

元数据要求:

http://testdomain.local/breeze/DataContext/Metadata

客户端错误:(create new productStockItem)

Unable to locate a 'Type' by the name: 'ProductStockItem'. Be sure to execute a query or call fetchMetadata first.
    function createProductStockItem(initialValues) {
        return this.manager.createEntity("ProductStockItem", initialValues);
    }

Answer 1

在重新构建应用程序时，元数据将得到更新。不需要额外的工作来制作

元数据的更新状态

当您对包含在元数据中的实体发出查询时，更新的元数据

对于创建实体，如果在包含查询的任何页面之前直接导航到创建实体的页面，则在这种情况下不会获取元数据。

当你调用fetchMetadata()时，你仍然得到错误:

Unable to locate a 'Type' by the name: 'New Class'. Be sure to execute a query or call `fetchMetadata` first

该消息不表示已获取元数据。它仍然告诉你实体是未知的，元数据仍然没有被获取。

为什么?因为createEntity()在fetchMetadata()之前。(你可以设置一个断点，看看它是如何工作的)

我以前遇到过这个问题，我所做的是，我只是把fetchMetadata()放在应用程序启动上。

这将保证在任何创建实体的调用之前，它将首先被获取。

或者你可以直接使用promise:

 manager.fetchMetadata().then(createProductStockItem("Initial values"));