我有一个用于多语言应用程序的大型数据库,它从服务器获取文本,插入数据库,然后根据用户首选语言,找到适当的文本。
首先让我描述数据库,然后我会说出我的问题:
插图:例如,我有一个表Product
,它有一个外键(Description
列)到Translation
表,后者又连接到TranslationEntry
表,其中包含所有表所有语言的产品描述的翻译。
这些语言位于一个名为Language
的单独表中,该表具有TranslationEntry
表的外键。
public class Product : BaseModel
{
public int description { get; set; }
public virtual Translation Description { get; set; }
}
public class Translation : BaseModel
{
public Translation()
{
Products = new List<Product>();
}
public virtual ICollection<Product> Products { get; set; }
public virtual ICollection<MainCategory> MainCategories { get; set; }
public virtual ICollection<Caption> Captions { get; set; }
}
public class TranslationEntry : BaseModel
{
public string text { get; set; }
public int language { get; set; }
public virtual Language Language { get; set; }
public int translation { get; set; }
public virtual Translation Translation { get; set; }
}
public class Language : BaseModel
{
public Language()
{
TranslationEntries = new List<TranslationEntry>();
}
public string title { get; set; }
public string language_code { get; set; }
public virtual ICollection<TranslationEntry> TranslationEntries { get; set; }
}
public class BaseModel
{
public int id { get; set; }
public int MembershipId { get; set; }
public SyncStatus SyncState { get; set; }
....
}
翻译条目映射:
HasRequired(translationEntry => translationEntry.Translation)
.WithMany(translation => translation.TranslationEntries)
.HasForeignKey(translationEntry =>
new {translationEntry.translation, translationEntry.MembershipId, translationEntry.SyncState})
.WillCascadeOnDelete(false);
HasRequired(translationEntry => translationEntry.Language)
.WithMany(language => language.TranslationEntries)
.HasForeignKey(translationEntry =>
new {translationEntry.language, translationEntry.MembershipId, translationEntry.SyncState})
.WillCascadeOnDelete(false);
Property(t => t.translation)
.HasColumnAnnotation("Index", new IndexAnnotation(new IndexAttribute("IX_translatinlanguageOd", 1) { IsUnique = true }));
Property(t => t.language)
.HasColumnAnnotation("Index", new IndexAnnotation(new IndexAttribute("IX_translatinlanguageOd", 2) { IsUnique = true }));
产品图谱:
HasRequired(product => product.Description)
.WithMany(translation => translation.Products)
.HasForeignKey(product => new { product.description, product.MembershipId, product.SyncState })
.WillCascadeOnDelete(false);
此处的示例数据集:
现在问题:我想获得产品的描述,我使用以下命令
var o = databaseContext.Products.ToList().First(p=>p.id==1)?.Description.TranslationEntries.First(te=>te.language==1);
但是我收到了错误:
A&#39;制图&#39;处理查询时发生异常。查看内部异常。
内部例外:
找不到一个属性地图,找到属性&#39; translation&#39;使用不区分大小写的搜索时。
请注意,我展示的许多实体与Product
表具有相同的翻译关系。
UPDATE
:
我的临时解决方案是:
var Language = context.Languages.Include(l => l.TranslationEntries)
.Where(l => l.id == languageId)
.ToList()
.FirstOrDefault();
TranslationEntries = Language?.TranslationEntries;
var translatedText = (from t in TranslationEntries where t.translation == 2 select t.text).FirstOrDefault();
答案 0 :(得分:0)
最后解决了这个愚蠢的问题!
正如错误消息所说,问题是通过不区分大小写的搜索在TranslationEntry
类中有2个名为translation的属性,我重命名了其中一个,现在一切正常,没有任何问题!