Base entity interface is IEntity which requires only "object ID {get;set;}" to be implemented.
Now, in almost every case ID is of Guid type (except for membership etc).
I am using following code to do mapping of interface
...
AnyPart<IEntity> primaryMap = ReferencesAny(x => x.Primary)
.IdentityType<object>() // tried with .IdentityType<Guid>()
.EntityIdentifierColumn("PrimaryID")
.EntityTypeColumn("PrimaryType")
.MetaType<string>();
...
Of course, next I am adding meta values.
So, Now getting error
Source array was not long enough. Check srcIndex and length, and the array's lower bound
And with .IdentityType<Guid>()
could not resolve property: Primary.ID of: Founder.Connection [.SingleOrDefault[Founder.Connection](NHibernate.Linq.NhQueryable`1[Founder.Connection], Quote((x, ) => (OrElse(AndAlso(Equal(x.Primary.ID, 35c2142a-4c17-4b77-96fd-a2570028a211), Equal(x.Secondary.ID, 35c2142a-4c17-4b77-96fd-a2570028a211)), AndAlso(Equal(x.Secondary.ID, 35c2142a-4c17-4b77-96fd-a2570028a211), Equal(x.Primary.ID, 35c2142a-4c17-4b77-96fd-a2570028a211))))), )]
UPDATE:
I tried also with .IdentityType(x=>x.ID) but same problem (Source array was not long enough)
UPDATE II:
Query (Actually whole method containing query) that this error occurs on is bellow:
public IQueryable<Connection> GetConnections(IEntity connectable)
{
IQueryable<Connection> query =
Query().Where(
x => x.Primary.ID == connectable.ID || x.Secondary.ID == connectable.ID);
return query;
}
Try this in the query: x.Primary == connectable (without ID).
The problem is that you reference an object (or another unmapped type, that's why you need an any mapping). There is no ID on object.
By the way, using HQL would allow you to access the id by using the keyword id, which is not available in Linq (technically it could be made available as extension method, but I don't know Linq to NH good enough to say if it had been implemented). Every any reference conceptually has an id and a class.
Related
I'm following Sulu example here: https://github.com/sulu/sulu-workshop/
trying to set translations for custom entity type.
My entity file has getter for field "home_team" defined like:
/**
* #Serializer\VirtualProperty(name="home_team")
*/
public function getHomeTeam(): ?string
{
$translation = $this->getTranslation($this->locale);
if (!$translation) {
return null;
}
return $translation->getHomeTeam();
}
So field is not actually part of that entity, but of it's translation entity since it suppose to be translatable.
When I try to create new object of that entity type it works well. I can see in database that field values are stored well and I don't get any error.
But on overview page instead of list of all objects I get error:
[Semantical Error] line 0, col 73 near 'home_team AS': Error: Class App\Entity\MatchEvent has no field or association named home_team
Any idea what could be wrong here?
If you wanna see the translation in the listView you have to create a real translationEntity, like in the workshop project. In this post it is already explained, how to translate a custom entity correctly.
If you have already created your translationEntity you have to configure the relation of the translation to your main entity via a join. Here is an example in the workshop for this configuration.
Sulu uses optimised queries to create the list-object directly from the database. So the entity itself does not get hydrated or serialised for performance reasons. Thus your virtualProperty is never executed.
I am trying to get a QueryOver working using a Projection on a many-to-one.
The class "Post" has a property many-to-one "Creator".
Using
session.QueryOver(Of Post).
Select(Projections.
Property(of Post)(Function(x) x.Creator).
WithAlias(Function() postAlias.Creator)).
TransformUsing(Transformers.AliasToBean(Of Post)()).
List()
works BUT each creator is retrieved by a single query rather than using a join like it is done when not using a select/projection. So if there are 5 posts with 5 different creators, 6 queries will be run 1 for the list of posts and 5 for the creators.
I tried to get it working using a JoinAlias but nothing really did the job.
I already searched for a solution, but all solutions I found did use the Linq-Provider which does not really fit since the actual "field list" is passed via a parameter.
Does anyone know if there is a solution to this other than the linq provider?
There is a solution, we can use projections for many-to-one and then custom result transformer.
DISCLAIMER: I can read VB syntax but do not have enough courage to write... I expect that you can read C# and convert it into VB....
So we can have projection like this:
// aliases
Post root = null;
Creator creator = null;
// projection list
var columns = Projections.ProjectionList();
// root properties
columns.Add(Projections.Property(() => root.ID).As("ID"));
columns.Add(Projections.Property(() => root.Text).As("Text"));
// reference properties
columns.Add(Projections.Property(() => creator.ID).As("Creator.ID"));
columns.Add(Projections.Property(() => creator.FirstName).As("Creator.FirstName"));
// so our projections now do have proper ALIAS
// alias which is related to domain model
// (because "Creator.FirstName" will be use in reflection)
var query = session.QueryOver<Post>(() => root)
.JoinAlias(() => root.Creator, () => creator)
.Select(columns)
Now we would need smart Transformer, our own custome one (plugability is power of NHibernate). Here you can find one:
public class DeepTransformer
And we can continue like this
var list = query
.TransformUsing(new DeepTransformer<Post>())
.List<Post>()
Check also this:
Fluent NHibernate - ProjectionList - ICriteria is returning null values
NHibernate AliasToBean transformer associations
When using ReferencesAny<> there is .EntityTypeColumn("MyType") which is not visible to application.
Is there option to query by that column using HQL or something and how to integrate into my LINQ to HQL queries?
As always, NHibernate has solution for (almost) everything.
Let's assume mapping like this (ala documentation):
ReferencesAny(x => x.AnyEntity) // the property name is AnyEntity... used below
// some explicit mapping
.AddMetaValue<Household>(typeof(Employee).Name)
.AddMetaValue<Client>(typeof(Contact).Name)
// the essence of <any>
.EntityTypeColumn("MyType")
.EntityIdentifierColumn("TheId")
.IdentityType<int>();
A cite from doc: 14.7. The where clause:
Likewise, the special property class accesses the discriminator value of an instance in the case of polymorphic persistence. A .Net class name embedded in the where clause will be translated to its discriminator value.
So, now we've informed NHibernate, that the colunn MyType contains the type, the equiv of the C# type. Because we can access EntityTypeColumn via the .class - this query will give us what we want:
// the 'Contact' represents the value contained in DB...
var hql = "from MyEntity where AnyEntity.class = 'Contact' ";
...
session.CreateQuery(hql)
.List<MyEntity>();
this will generate the WHERE ... MyType = 'Contact'
The same in the QueryOver:
var query = session.QueryOver<MyEntity>()
.Where(x => x.AnyEntity is Contact)
.List<MyEntity>();
NOTE: the bad news, that with built in LINQ provider, similar query is failing. I would guess it is a bug. I.e. this is not working session.Query<MyEntity>().Where(x => x.AnyEntity is Contact), generating the wrong WHERE clause
EXTENDED as asked in the comment
We can also filter by the <any> elements ID, the 'EntityIdentifierColumn'
The syntax would look like this (see the magical ".id" selector")
query
...
.Where(Restrictions.In("AnyEntity.id", new[] {1, 2, 3, 4, 5, 6, 7, 8}))
...
How about simply mapping the column in the entity you reference. Have a base class for all kind of types for example?
I would like to know how to configure NHibernate "mapping by code" so that when I map a property of a certain type, it uses a certain userType to perform that mapping. It figures this out by convention.
For example, if I have an Account class with a property Currency of type Currency, then the NHibernate configuration should figure out (by convention) that it needs to use the CurrencyUserType to perform the mapping.
I'm unable to find the relevant documentation for this, so if such documentation does exist, then a few links will be appreciated too.
Note: This is not a FluentNHibernate question.
var mapper = new ConventionModelMapper();
mapper.IsProperty((info, b) => b || info.GetPropertyOrFieldType() == typeof(Currency));
mapper.BeforeMapProperty +=
(inspector, member, customizer) =>
{
if (member.LocalMember.GetPropertyOrFieldType() == typeof(Currency))
customizer.Type<CurrencyUserType>();
};
I've got a table called AdministratorPrivilages that has the following fields:
ID
List item
MemberId
Value
MemberType
Now, the members can be of two types (Enterprise and Express). Enterprise members live in the enterprise table. Express members live in the expressmember table. I've tried to do my fluent mapping like so.
public class AdministratorPrivilegesMapping : ClassMap<AdministratorPrivileges>
{
public AdministratorPrivilegesMapping()
{
Id(x=>x.Id);
Map(x => x.Value).Column("Value");
ReferencesAny(x => x.Member)
.EntityTypeColumn("MemberType")
.EntityIdentifierColumn("MemberId")
.IdentityType<Int32>()
.AddMetaValue<ExpressMember>("Express")
.AddMetaValue<Member>("Enterprise");
}
}
Both member tables have integer ids with ascending values. When I try to pull back the privilages associated with enterprise member 10, I'm getting the permission set associated with Express Member 10. Both other tables are mapped with the old school hbm mapping files.
Am I missing something obvious? I'm using NHibernate 2.1 and FluentNhibernate 1.1
I actually found the solution using .Where().
My situation is a little different, I have objectA and objectB.
objectA contains objectB, but objectB also contains a collection of objectBs.
"objectA":{
"someProp" : "(string)",
"objectB":{
"someProp" : "(string)",
"comeCol" : [
"(objectB)"
]
}
}
So the "Parent" property of objectB can either be of type objectB or objectA, which is why I needed to use ReferencesAny in the mapping of objectB.
Mapping looks like
ReferencesAny( x => x.Parent )
.IdentityType< int >()
.MetaType< string >()
.EntityTypeColumn( "ParentType" )
.EntityIdentifierColumn( "ParentId" )
.AddMetaValue< objectA >( "E" )
.AddMetaValue< objectB >( "S" )
.Access.Property()
.LazyLoad()
.Cascade.All();
All this works well when saving, however, my problem occured when retrieving, because the framework wasn't told what to retrieve and simply retrieved everything.
So now here is the mapping of the collection that fixed the problem:
HasMany( x => x.objectBs )
.KeyColumn( "ParentId" )
.Where( "ParentType = 'S'" )
.Cascade.All()
.LazyLoad();
Hope it will help anyone in the same situation :)
As seems to always be the case when I post on Stackoverflow, I'm being a complete goober and missing something glaringly obvious that cleared itself up with a good night's rest and some caffeine. I needed to look into the mappings for the ExpressMember and Member classes. Turns out the bag declarations there didn't filter by the type of object appropriately. Initially, I thought I had made the breaking change, when in fact it was actually a very old issue. The collision in id numbers between the two different types of members was not an issue for a very long time, as express members typically have either all the permissions or none, as do most of the older members (which were created first under an admin/plebe scheme with privileges being broken out later).