Storing Auto-generated TS Vector from Unmapped Fields

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Issue 类型
功能
描述清晰度
基本清楚
活跃度
停滞
技术栈
csharp, postgresql
领域
databases

调研方向

Start with the HasGeneratedTsVectorColumn configuration shown in the issue and trace the failure through NpgsqlAnnotationProvider.For and the EF Core column-name lookup in the stack trace. Reproduce the model with the [NotMapped] source property and inspect the provider’s existing generated-tsvector tests. Done means the model can be created with the unmapped source property and the generated tsvector column works without storing the raw text.

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描述

I would like to store only a tsvector column in my PostgreSQL table without saving the original text itself. To achieve this, I have created a text variable in my model class and marked it with [NotMapped].

The model is configured so that the tsvector column is automatically generated based on the content of this unmapped text property. It would be very helpful if EF Core could support storing auto-generated tsvector columns derived from unmapped fields, allowing us to keep the tsvector for full-text search while avoiding storage of the raw text.

Model:

    [NotMapped]
    public required string FullTextSearch { get; set; }
    public NpgsqlTsVector FullSearchVector { get; set; }

Model Configuration:

builder.HasGeneratedTsVectorColumn(record => record.FullSearchVector, 
       "english",
        record => record.FullTextSearch);

Exception:

 System.NullReferenceException: Object reference not set to an instance of an object.
         at Microsoft.EntityFrameworkCore.Metadata.Internal.RelationalPropertyOverrides.Find(IReadOnlyProperty property, StoreObjectIdentifier& storeObject)
         at Microsoft.EntityFrameworkCore.RelationalPropertyExtensions.FindOverrides(IReadOnlyProperty property, StoreObjectIdentifier& storeObject)
         at Microsoft.EntityFrameworkCore.RelationalPropertyExtensions.GetColumnName(IReadOnlyProperty property, StoreObjectIdentifier& storeObject)
         at Npgsql.EntityFrameworkCore.PostgreSQL.Metadata.Internal.NpgsqlAnnotationProvider.<>c__DisplayClass2_1.<For>b__10(String p2)
         at System.Linq.Enumerable.SelectArrayIterator`2.Fill(ReadOnlySpan`1 source, Span`1 destination, Func`2 func)
         at System.Linq.Enumerable.SelectArrayIterator`2.ToArray()
         at Npgsql.EntityFrameworkCore.PostgreSQL.Metadata.Internal.NpgsqlAnnotationProvider.For(IColumn column, Boolean designTime)+MoveNext()
         at Microsoft.EntityFrameworkCore.Infrastructure.AnnotatableBase.AddAnnotations(AnnotatableBase annotatable, IEnumerable`1 annotations)
         at Microsoft.EntityFrameworkCore.Infrastructure.AnnotatableBase.AddAnnotations(IEnumerable`1 annotations)
         at Microsoft.EntityFrameworkCore.Metadata.Internal.RelationalModel.Create(IModel model, IRelationalAnnotationProvider relationalAnnotationProvider, IRelationalTypeMappingSource relationalTypeMappingSource, Boolean designTime)
         at Microsoft.EntityFrameworkCore.Metadata.Internal.RelationalModel.Add(IModel model, IRelationalAnnotationProvider relationalAnnotationProvider, IRelationalTypeMappingSource relationalTypeMappingSource, Boolean designTime)
         at Microsoft.EntityFrameworkCore.Infrastructure.RelationalModelRuntimeInitializer.InitializeModel(IModel model, Boolean designTime, Boolean prevalidation)
         at Microsoft.EntityFrameworkCore.Infrastructure.ModelRuntimeInitializer.Initialize(IModel model, Boolean designTime, IDiagnosticsLogger`1 validationLogger)
         at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel(DbContext context, ModelCreationDependencies modelCreationDependencies, Boolean designTime)
         at Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel(Boolean designTime)
         at Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_DesignTimeModel()
         at Microsoft.EntityFrameworkCore.Metadata.Internal.DesignTimeModel.get_Model()
         at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlDatabaseCreator.CreateTablesAsync(CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreatedAsync(CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreatedAsync(CancellationToken cancellationToken)
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