Ignore a property when mapping by code. NH3.2

[Michael DELVA]

Hello all,

I couldn't find any method to make the convention mapper ignore some properties for my entities.

Is it possible?

Thanks in advance

Michael

[Fabio Maulo]

yes it is.

Send here your example and the prop you want ignore.

Please send the real impl. of that prop in your domain and the reason because you want ignore it.

I have to check why my patterns have not discovered it... if it is only a matter of read your mind there is no problem, but if it can be discovered I would do it by default. 

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Fabio Maulo

[Michael DELVA]

Fabio,

Disclaimer: I don't know if what I show below is the most correct way, so please don't hurt ;)

I have this entity:

public class Action : BaseEntity

{

    private IStatistic statistic;

    private int statisticId;

        

    public int StatisticId

    {

        get { return statisticId; }

        set

        {

            statisticId = value;

            statistic = StatisticsFactory.Get(value);

        }

    }

       

    public IStatistic Statistic

    {

        get { return statistic; }

        set

        {

            statistic = value;

            statisticId = value.Id;

        }

    }

}

I'd like to map the Statistic field to the database, and not the IStatistic object.

How could I do that?

Thanks in advance

[Fabio Maulo]

With ModelMapper is enough avoiding the map of that property.

With ConventionModelMapper (or when you inject the SimpleModelInspector to the ModelMapper) you can use this:

public void IsPersistentProperty(Func<MemberInfo, bool, bool> match)

There are other options but is too large...

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Fabio Maulo

[Michael DELVA]

Thanks for your answer.

Using the same domain as my previous post, I added this to the ConventionModelMapper:

mapper.IsPersistentProperty((mi,declared) =>

{

if (mi.DeclaringType == typeof(Action) && mi.Name == "Statistic")

return false;

return true;

});

But I still get this exception (with the StackTrace) when I want to export the schema:

NHibernate.MappingException: Could not determine type for: TestsMappingsNH.Entities.IStatistic, TestsMappingsNH, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null, for columns: 

NHibernate.Mapping.Column(<Statistic>k__BackingField)

at NHibernate.Mapping.SimpleValue.get_Type() in SimpleValue.cs: line 239

at NHibernate.Mapping.Column.GetSqlTypeCode(IMapping mapping) in Column.cs: line 392

at NHibernate.Mapping.Column.GetDialectTypeName(Dialect dialect, IMapping mapping) in Column.cs: line 219

at NHibernate.Mapping.Column.GetSqlType(Dialect dialect, IMapping mapping) in Column.cs: line 208

at NHibernate.Mapping.Table.SqlCreateString(Dialect dialect, IMapping p, String defaultCatalog, String defaultSchema) in Table.cs: line 372

at NHibernate.Cfg.Configuration.GenerateSchemaCreationScript(Dialect dialect) in Configuration.cs: line 895

at NHibernate.Tool.hbm2ddl.SchemaExport.Initialize() in SchemaExport.cs: line 67

at NHibernate.Tool.hbm2ddl.SchemaExport.Execute(Action`1 scriptAction, Boolean export, Boolean justDrop) in SchemaExport.cs: line 296

at NHibernate.Tool.hbm2ddl.SchemaExport.Execute(Boolean script, Boolean export, Boolean justDrop) in SchemaExport.cs: line 290

at NHibernate.Tool.hbm2ddl.SchemaExport.Create(Boolean script, Boolean export) in SchemaExport.cs: line 105

at TestsMappingsNH.Tests.FactMethodName() in Program.cs: line 53 

[Fabio Maulo]

Two pointd:

1)

mapper.IsPersistentProperty((mi,declared) =>

{

if (mi.DeclaringType == typeof(Action) && mi.Name.Tolower() == "statistic")

return false;

return true;

});

2) what you sent here is not what you are trying to map because in your real case  you have an autoproperty.

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Fabio Maulo

[Michael DELVA]

Two pointd:

1)

mapper.IsPersistentProperty((mi,declared) =>

{

if (mi.DeclaringType == typeof(Action) && mi.Name.Tolower() == "statistic")

return false;

return true;

});

2) what you sent here is not what you are trying to map because in your real case  you have an autoproperty.

1) I had to add a check for PropertyInfo, otherwise the schema was invalid (it was trying to set backing fields as columns)

mapper.IsPersistentProperty((mi,declared) =>

{

if (mi.DeclaringType == typeof(Action) && mi is PropertyInfo && mi.Name.ToLower() == "statistic")

return false;

return true;

}); 

2) I have these entities:

public class Action : BaseEntity

{

    private IStatistic statistic;

    private int statisticId;

        

    public int StatisticId

    {

        get { return statisticId; }

        set

        {

            statisticId = value;

            statistic = StatisticsFactory.Get(value);

        }

    }

       

    public IStatistic Statistic

    {

        get { return statistic; }

        set

        {

            statistic = value;

            statisticId = value.Id;

        }

    }

}

And I always get this error, despite the IsPersistentProperty method returning false for the ignored property...

Could not determine type for: TestsMappingsNH.Entities.IStatistic, TestsMappingsNH, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null, for columns: NHibernate.Mapping.Column(statistic)

   at NHibernate.Mapping.SimpleValue.get_Type() in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Mapping\SimpleValue.cs:line 239

   at NHibernate.Mapping.Column.GetSqlTypeCode(IMapping mapping) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Mapping\Column.cs:line 392

   at NHibernate.Mapping.Column.GetDialectTypeName(Dialect dialect, IMapping mapping) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Mapping\Column.cs:line 219

   at NHibernate.Mapping.Column.GetSqlType(Dialect dialect, IMapping mapping) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Mapping\Column.cs:line 208

   at NHibernate.Mapping.Table.SqlCreateString(Dialect dialect, IMapping p, String defaultCatalog, String defaultSchema) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Mapping\Table.cs:line 372

   at NHibernate.Cfg.Configuration.GenerateSchemaCreationScript(Dialect dialect) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 895

   at NHibernate.Tool.hbm2ddl.SchemaExport.Initialize() in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Tool\hbm2ddl\SchemaExport.cs:line 67

   at NHibernate.Tool.hbm2ddl.SchemaExport.Execute(Action`1 scriptAction, Boolean export, Boolean justDrop) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Tool\hbm2ddl\SchemaExport.cs:line 296

   at NHibernate.Tool.hbm2ddl.SchemaExport.Execute(Boolean script, Boolean export, Boolean justDrop) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Tool\hbm2ddl\SchemaExport.cs:line 286

   at NHibernate.Tool.hbm2ddl.SchemaExport.Create(Boolean script, Boolean export) in D:\__PROG STUFF__\VS\2010\Projects\nhibernate\src\NHibernate\Tool\hbm2ddl\SchemaExport.cs:line 105

   at TestsMappingsNH.Tests.FactMethodName() in D:\__PROG STUFF__\VS\2010\Projects\Tests\New folder\TestsMappingsNH\Program.cs:line 53

[Fabio Maulo]

remove the check on PropertyInfo. Fields are candidates to be persisted.

The ICandidatePersistentMembersProvider, injected to the ModelMapper, is the responsible to determine candidate members to be persisted.

Given a class the DefaultCandidatePersistentMembersProvider will return properties and fields.

The default impl. of IsPersistentProperty is

 (mi, declared) => declared || ((mi is PropertyInfo) && MatchNoReadOnlyPropertyPattern(mi));

I can't check your class right now (I'm in the middle of something); I'll check it later today or tomorrow.

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Fabio Maulo

[Fabio Maulo]

ah!! Michael,

Thanks to let me see that there are some place to improve ;).

In ConfORM the answer is easy but in NH I have simplified it and perhaps not everything was so simplified LOL!!

In ConfORM is:

orm.ExcludeProperty<Action>(x=> x.Statistic);

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Fabio Maulo

[Michael DELVA]

I'm glad to have found some more work for you to do :)

So I have to use the ModelMapper while you release a new version with the fix?

PS: What about the something you were into the middle? ;)

[Fabio Maulo]

LOL!! 

It is only about code, are not two legs.

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Fabio Maulo