I'm a newbie in MVC apps, and I've encountered a very specific problem. Thing is, I have 2 classes: "Paciente" and "Analises".
public class Paciente
{
public virtual Guid PacienteID { get; set; }
public virtual string Nome { get; set; }
public virtual string Sexo { get; set; }
public virtual DateTime DataDeNasc { get; set; }
public virtual int IdadeDiag { get; set; }
public virtual IList<Analises> analises { get; set; }
}
public class Analises
{
public virtual Guid AnaliseID { get; set; }
// some analysiss values
public virtual decimal afp { get; set; }
public virtual decimal hemoglobina { get; set; }
public virtual DateTime DataDaAnalise { get; set; }
public virtual Paciente pac { get; set; }
}
So, a Patient has many Analysis, and each Analysis has one Patient (on-to-many).
I have mapped this with NHIbernate and FluentNHibernate:
public PacienteMap()
{
Table("pacientes");
Id(x => x.PacienteID).GeneratedBy.Guid();
Map(x => x.Nome);
Map(x => x.Sexo);
Map(x => x.DataDeNasc).CustomType("Date");;
Map(x => x.IdadeDiag);
HasMany(m => m.analises).Not.KeyNullable().Fetch.Join().KeyColumn("pacienteid");
}
public AnalisesMap()
{
Table("analises");
Id(x => x.AnaliseID).GeneratedBy.Guid();
Map(x => x.afp);
Map(x => x.hemoglobina);
Map(x => x.DataDaAnalise).CustomType("Date");
References(x => x.pac).ForeignKey("pacienteid").Not.Nullable();
}
My problem is that I'm using jTable to show this. I want to see a list of Patients (and it works), and then, a list of analysis for each patient (doesn't work!)
My Controller goes like this:
[HttpPost]
public JsonResult AnalisesList(Guid pacienteId)
{
try
{
var list_analises = AnalisesRepository.GetPacienteAnalises(pacienteId);
var all_analises = Mapper.Map<IEnumerable<Analises>, IEnumerable<AnalisesView>>(list_analises);
List<AnalisesView> analises = all_analises.ToList();
return Json(new { Result = "OK", Records = analises });
}
catch (Exception ex)
{
return Json(new { Result = "ERROR", Message = ex.Message });
}
}
I am also using automapper to go from the Object Views from Database Objects.
So, rigth now, my analysis list does not show! I don't know why. The GetPacienteAnalises is like:
public IList<T> GetPacienteAnalises (Guid pacienteId)
{
using (ISession session = SessionManager.OpenSession())
{
using (ITransaction transaction = session.BeginTransaction())
{
return session.CreateCriteria(typeof(T)).Add(Restrictions.Eq("pacienteid", pacienteId)).List<T>();
}
}
}
So, I think everything is Okay... But I keep receiving a "could not resolve property: pacienteid of: Infraestrutura.Models.Analises".
Your problem is in this line:
return session.CreateCriteria(typeof(T))
.Add(Restrictions.Eq("pacienteid", pacienteId))
.List<T>();
I assume that T in this case is Analises. Analises does not have a property named pacienteid. Instead, it has a property named pac. Replace "pacienteid" with "pac.PacienteID". The fields that you use when creating the criteria should be the property names, not the column names.
return session.CreateCriteria(typeof(T))
.Add(Restrictions.Eq("pac.PacienteID", pacienteId))
.List<T>();
If you were filtering by some column other than Paciente's primary key, Nome for example, then a join would be necessary. In that case, you would do something like:
session.CreateCriteria(typeof(T))
.CreateAlias("pac", "p") // CreateAlias performs an inner join
.Add(Expression.Eq("p.Nome", name))
.List<T>()
But no join is needed to get to pac.PacienteID.
Related
public IHttpActionResult GetAllCollections(CollectionsDTO collectionsDTO)
{
if (!ModelState.IsValid)
return BadRequest();
try
{
var collectionsSectionRolesFlatDTO = (from c in db.Collections
join sr in db.SectionRole
on c.SectionRoleId equals sr.Id
select new CollectionsSectionRolesFlatDTO
{
Collections = new CollectionsDTO
{
CollectionTitleAr = c.CollectionTitleAr,
CollectionTitleEn = c.CollectionTitleEn,
CoverImagePath = c.CoverImagePath,
SectionRoleId = c.SectionRoleId,
},
SectionRole = new SectionRoleDto
{
NameAr = sr.NameAr,
NameEn = sr.NameEn
}
})
.AsQueryable();
var collectionsDto = Mapper.Map<List<CollectionsSectionRolesDTO>>(collectionsSectionRolesFlatDTO);
return Ok(collectionsDto);
}
catch (Exception ex)
{
return BadRequest("GetAllCollection: "+ ex.ToString());
}
}
DTOs:
public class CollectionsDTO
{
public int Id { get; set; }
public string CollectionTitleEn { get; set; }
public string CollectionTitleAr { get; set; }
public string CoverImagePath { get; set; }
public int? SectionRoleId { get; set; }
}
public class CollectionsSectionRolesFlatDTO
{
public SectionRoleDto SectionRole { get; set; }
public CollectionsDTO Collections { get; set; }
}
public class CollectionsSectionRolesDTO
{
public int Id { get; set; }
public string CollectionTitleEn { get; set; }
public string CollectionTitleAr { get; set; }
public string CoverImagePath { get; set; }
public int? SectionRoleId { get; set; }
//section role
public string NameAr { get; set; }
public string NameEn { get; set; }
}
public class SectionRoleDto
{
public int Id { get; set; }
public string NameEn { get; set; }
public string NameAr { get; set; }
}
Automapper:
CreateMap<Collections, CollectionsDTO>();
CreateMap<CollectionsSectionRolesFlatDTO, CollectionsSectionRolesDTO>();
Now the problem is mindboggling.
this line
var collectionsDto = Mapper.Map<List<CollectionsSectionRolesDTO>>(collectionsSectionRolesFlatDTO);
is supposed to return the data but instead it returns what I have passed in the function param.
Why is this happening? I have spent literally hours but nothing. I checked all the automapper setting but this doesn't work.
I am new to c# so any help regarding it would be appreciated. thanks.
Why would you be going through the trouble of double projection? Just configure Automapper with the information to get a desired DTO out of the object graph. Ensure you have navigation properties set up for your relationships to make querying against the object graph a lot simpler. Linq & EF does not need to be written as a substitute for SQL. (explicit joins) Navigation properties allow EF to provide those joins entirely behind the scenes for simpler querying.
First, the mapping:
CreateMap<Collections, CollectionsSectionRolesDTO>()
// Id, NameAr, and NameEn should auto-resolve.
.ForMember(x => x.CollectionTitleEn, opt => opt.MapFrom(src => src.Collection.CollectionTitleEn))
.ForMember(x => x.CollectionTitleAr, opt => opt.MapFrom(src => src.Collection.CollectionTitleAr));
// Continue for fields coming from Collection...
then to query using the automapper config. (config)
var results = db.Collections
.ProjectTo<CollectionsSectionRolesDTO>(config)
.ToList();
Done and dusted. No need to select and flatten data first into memory then use Automapper to create a new in-memory collection of the desired view model. Just project down to the desired view model directly within the query.
Double-projection is useful where you need to flatten data down first in order to perform conversions or transforms that cannot be converted in SQL. The first projection (Select) would typically be to an anonymous type or a DTO using ProjectTo, then fed into code that would provide the necessary transformations to produce the end result view models/DTOs.
I have read a lot of the questions about that same error but none since to match my exact problem. I'm trying to access the property of an object, itself part of a root object, using Fluent NHibernate. Some answers say I need to use projections, others that I need to use join, and I think it should work through lazy loading.
Here are my two classes along with the Fluent mappings:
Artist class
public class Artist
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual IList<Album> Albums { get; set; }
public virtual string MusicBrainzId { get; set; }
public virtual string TheAudioDbId { get; set; }
public Artist() { }
}
public class ArtistMap : ClassMap<Artist>
{
public ArtistMap()
{
LazyLoad();
Id(a => a.Id);
Map(a => a.Name).Index("Name");
HasMany(a => a.Albums)
.Cascade.All();
Map(a => a.MusicBrainzId);
Map(a => a.TheAudioDbId);
}
}
Album class
public class Album
{
public virtual int Id { get; set; }
public virtual Artist Artist { get; set; }
public virtual string Name { get; set; }
public virtual IList<Track> Tracks { get; set; }
public virtual DateTime ReleaseDate { get; set; }
public virtual string TheAudioDbId { get; set; }
public virtual string MusicBrainzId { get; set; }
public Album() { }
}
public class AlbumMap : ClassMap<Album>
{
public AlbumMap()
{
LazyLoad();
Id(a => a.Id);
References(a => a.Artist)
.Cascade.All();
Map(a => a.Name).Index("Name");
HasMany(a => a.Tracks)
.Cascade.All();
Map(a => a.ReleaseDate);
Map(a => a.TheAudioDbId);
Map(a => a.MusicBrainzId);
}
}
And the error happens when this code is interpreted:
var riAlbum = session.QueryOver<Album>()
.Where(x => x.Name == albumName && x.Artist.Name == artist)
.List().FirstOrDefault();
The error happens when Fluent NHibernate tries to resolve the x.Artist.Name value:
{"could not resolve property: Artist.Name of: Album"}
What would be the correct way of doing this?
You have to think of your QueryOver query as (nearly) directly translating into SQL. With this in mind, imagine this SQL query:
select
Album.*
from
Album
where
Album.Name = 'SomeAlbumName' and
Album.Artist.Name = 'SomeArtistName'
This won't work because you can't access a related table's properties like that in a SQL statement. You need to create a join from Album to Artist and then use a Where clause:
var riAlbum =
session.QueryOver<Album>()
.Where(al => al.Name == albumName)
.JoinQueryOver(al => al.Artist)
.Where(ar => ar.Name == artistName)
.List()
.FirstOrDefault();
Also, since you're using FirstOrDefault, you may want to consider moving that logic to the database end. Currently, you're pulling back every record matching your criteria and then taking the first one. You could use .Take to limit the query to 1 result:
var riAlbum =
session.QueryOver<Album>()
.Where(al => al.Name == albumName)
.JoinQueryOver(al => al.Artist)
.Where(ar => ar.Name == artistName)
.Take(1)
.SingleOrDefault<Album>();
Another explanation is that you are missing your mapping of this property or field in a NHibernateClassMapping definition. I came here about why I was getting this error based on the following scenario.
var query = scheduleRepository.CurrentSession().Query<Schedule>()
.Where(x => x.ScheduleInfo.StartDate.Date < dateOfRun.Date);
This was giving me a Could Not Resolve Property error for StartDate. This was a head scratcher, since I use this syntax all the time.
My mapping file was the following:
public class ScheduleInfoMapping : NHibernateClassMapping<ScheduleInfo>
{
public ScheduleInfoMapping()
{
DiscriminateSubClassesOnColumn("Type");
Map(x => x.Detail).MapAsLongText();
}
}
which was missing the StartDate. Changed to:
public class ScheduleInfoMapping : NHibernateClassMapping<ScheduleInfo>
{
public ScheduleInfoMapping()
{
DiscriminateSubClassesOnColumn("Type");
Map(x => x.Detail).MapAsLongText();
Map(x => x.StartDate);
}
}
Which resolved the error.
public class Category
{
public virtual int Id { set; get; }
public virtual string Name { set; get; }
public virtual int CategoryOrder { set; get; }
public virtual IEnumerable<News> LatestNews { set; get; }
}
public sealed class CategoryMap :ClassMap<Category>
{
public CategoryMap()
{
LazyLoad();
Id(x => x.Id);
Map(x => x.Name);
Map(x => x.CategoryOrder);
HasMany(x => x.LatestNews);
}
}
IRepository<Category> newsRepo = new NHibernateRepository<Category>();
using(var session = newsRepo.GetSessionFactory().OpenSession())
using(var transaction = session.BeginTransaction())
{
var result = session.Query<Category>().OrderBy(x => x.CategoryOrder);
transaction.Commit();
}
I have this category class Which I want to display a (only one) News per category. Is this correct mapping? or should i change it to Map
When i run this, it gets all the news per category. But i want the latest news per category (only one). I can get the latest news by querying News.DateUpdated.
How should i change the query to get one news per category?
or how do I get some of the News? ie: limit the number of news I can query?
I think you can have your cake and eat it too. You have a list of News items, so just leave that. But add in another property that gets just the News item you want.
public class Category
{
public virtual int Id { set; get; }
public virtual string Name { set; get; }
public virtual int CategoryOrder { set; get; }
public virtual IEnumerable<News> AllNews { set; get; }
public virtual News LatestNews
{
get
{
// probably needs some work
return this.AllNews.OrderByDescending(n => n.SomeDateField).Take(1);
}
}
}
public sealed class CategoryMap :ClassMap<Category>
{
public CategoryMap()
{
LazyLoad();
Id(x => x.Id);
Map(x => x.Name);
Map(x => x.CategoryOrder);
HasMany(x => x.AllNews);
}
}
you can use lazy mode extra to achieve this,
public News GetLatestNews(Category cat)
{
var session = SessionFactory.CurrentSession;
var news = session.CreateFilter(cat.LatestNews , "order by categoryorder").SetFirstResult((page - 1) * pageSize).SetFirstResult(0).SetMaxResults(1).List().FirstOrDefault();
return news;
}
however if you try to access the LatestNews collection directly, this won't be of any use as it will load all the news objects associated with Category from db which would lower the performance.
Is there a way I can setup mapping for a table that doesn't have a direct reference to another table? It actually gets it's reference from another table that I do have a direct reference from.
This is what I have so far, but I'm not sure how to map the "LookupValue" in my MetaData model. It would need to map to MetaData if the [mdd].DefinitionType equals the [mdl].LookupType and the [md].DataValue equals the [mdl].LookupKey.
public class MetaData {
public virtual long TableID { get; set; }
public virtual MetaDataDefinition Definition { get; set; }
public virtual int DefinitionID { get; set; }
public virtual String DataValue { get; set; }
public virtual MetaDataLookup LookupValue { get; set; }
public override bool Equals(object obj) { ... }
public over int GetHashCode() { ... }
}
public class MetaDataDefinition {
public virtual long ID { get; set; }
public virtual string DefinitionName { get; set; }
public virtual string DefinitionType { get; set; }
}
public class MetaDataLookup {
public virtual string Type { get; set; }
public virtual string LookupKey { get; set; }
public virtual string LookupValue { get; set; }
public override bool Equals(object obj) { ... }
public over int GetHashCode() { ... }
}
public class MetaDataMap : ClassMap<MetaData> {
public MetaDataMap() {
Table("PPOMetaData");
CompositeId()
.KeyProperty(x => x.TableID, "TableID")
.KeyProperty(x => x.DefinitionID, "DefinitionID");
References(x => x.Defintion, "DefinitionID").Not.LazyLoad().Cascade.All().Fetch.Join();
Map(x => x.TableID);
Map(x => x.DataValue);
}
}
public class MetaDataDefinitionMap : ClassMap<MetaDataDefinition> {
public MetaDataDefinitionMap() {
Table("MetaDataDefinitions");
Id(x => x.ID);
Map(x => x.DefinitionName);
Map(x => x.Type);
}
}
public class MetaDataLookupMap : ClassMap<MetaDataLookup> {
public MetaDataLookupMap() {
CompositeId()
.KeyProperty(x => x.LookupType)
.KeyProperty(x => x.LookupKey);
Map(x => x.LookupValue);
}
}
Ideally, I want to have it run a query similar to this:
SELECT data.TableID, data.DefinitionID, def.DefinitionName, data.DataValue,lu.LookupValue AS DataValue
FROM dbo.PPOMetadata AS data
INNER JOIN dbo.MetaDataDefinitions AS def ON def.ID = data.DefinitionID
LEFT OUTER JOIN dbo.MetaDataLookup AS lu ON lu.LookupType = def.Type AND lu.LookupKey = data.DataValue
WHERE data.TableID = 1
In terms of update ability, the only thing I would ever create, update or delete would be in the MetaData table. The definitions and Lookup values would never change (at least from this part of the application). Is mapping the "MetaDataLookup" directly to the MetaData model possible? If so, can someone point me in the right direction of what I should be looking at?
Thanks!
I came up with a workaround that seems to be working and might take some of the complexity out. Instead of trying to handle the complex joins in a ClassMap, I built a view in Sql Server that does this for me. In my application, I built a new Model and ClassMap for the view. I haven't implemented any update logic yet, but I think I'll have the update logic work directly on the MetaData model, while the read logic (which needs everything joined together) will use the new MetaDataView model.
I'm still curious if complex joins like this are possible in Fluent NHibernate, but for now this solution seems to be working for me.
i'm new to nhibernate so maybe the response depends on my lack of knowledge.
I created these two tables:
(sorry for italian language, i hope you can understand withouth any problems).
Then, i have these object in my model:
[Serializable]
public class Profilo
{
public virtual int Id { get; set; }
public virtual string Matricola { get; set; }
public virtual string Ruolo { get; set; }
public virtual IList ListaSedi { get; set; }
public Profilo()
{
ListaSedi = new List();
}
}
[Serializable]
public class Sede
{
public virtual string CodiceSede { get; set; }
public virtual string DescrizioneSede { get; set; }
public virtual Profilo Profilo { get; set; }
}
This is the way i mapped entities using fluent nhibernate:
public class Map_Sede : FluentNHibernate.Mapping.ClassMap
{
public Map_Sede()
{
Table("TBA_Sede");
Id(x => x.CodiceSede).Column("codice_sede").GeneratedBy.Assigned();
Map(x => x.DescrizioneSede)
.Column("descrizione");
References(prof => prof.Profilo)
.Column("codice_sede");
}
}
public class Map_Profilo : FluentNHibernate.Mapping.ClassMap
{
public Map_Profilo()
{
Table("TBA_Profilo");
Id(x => x.Id).Column("id").GeneratedBy.Identity();
Map(x => x.Matricola)
.Column("matricola");
Map(x => x.Ruolo)
.Column("ruolo");
HasMany(x => x.ListaSedi)
.AsBag()
.KeyColumns.Add("codice_sede")
.Not.LazyLoad()
.Cascade.None();
}
}
Now, i'd like to insert a new Profilo instance on my. Everything seems to work but nhibernate does not insert values on TBA_Profilo.codice_sede column. I noticed that the insert statement is composed by two parameters (matricola, ruolo) - why does it forget the third parameter?
I read somewhere (on nhibernate mailing list) that's quite normal 'cause nhiberate insert values with null first and then update the same records with right values contained in the list property.
Is it right?
Am i doing any errors?
I hope to have clarified the situation.
thx guys
ps: I'm using Nhibernate 2.1 and fluent nhibernate 1.1
UPDATE: This is the code i use to save entity.
var sesionFactory = NHibernateHelper.createSessionFactory();
using (NHibernate.ISession session = sesionFactory.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
try
{
session.SaveOrUpdate(entity);
transaction.Commit();
session.Flush();
}
catch (Exception)
{
transaction.Rollback();
throw;
}
finally
{
transaction.Dispose();
}
}
}
UPDATE 2: Following sly answer i slightly modified my solution. These are new model entities:
[Serializable]
public class Profilo
{
public virtual int Id { get; set; }
public virtual string Matricola { get; set; }
public virtual string Ruolo { get; set; }
public virtual IList ListaSedi { get; set; }
public Profilo()
{
ListaSedi = new List();
}
}
[Serializable]
public class Sede
{
public virtual string CodiceSede { get; set; }
public virtual string DescrizioneSede { get; set; }
public virtual IList ProfiliAssociati { get; set; }
}
And new mappings:
public class Map_Sede : FluentNHibernate.Mapping.ClassMap
{
public Map_Sede()
{
Table("TBA_Sede");
Id(x => x.CodiceSede).Column("codice_sede").GeneratedBy.Assigned();
Map(x => x.DescrizioneSede)
.Column("descrizione");
HasMany(x => x.ProfiliAssociati)
.AsBag()
.KeyColumns.Add("codice_sede")
.Cascade.All();
}
}
public class Map_Profilo : FluentNHibernate.Mapping.ClassMap
{
public Map_Profilo()
{
Table("TBA_Profilo");
Id(x => x.Id).Column("id").GeneratedBy.Identity();
Map(x => x.Matricola)
.Column("matricola");
Map(x => x.Ruolo)
.Column("ruolo");
HasMany(x => x.ListaSedi)
.AsBag()
.Inverse()
.KeyColumns.Add("codice_sede")
.Cascade.SaveUpdate();
}
}
Now it seems quite to work: i mean that nhibernate can write TBA_Profilo.codice_sede column even if it doesn't cicle on Profilo.IList (it inserts the last element of this List).
Any ideas?
KeyColumns mapping is applied only child table in many-to-one connection.
If you want to have connection you will need to use Id column from TBA_portfolio table and reference it from TBA_Sede.
Something like this:
Tba_portfolio
Id|matricola|ruolo
Tba_sede
Id|PorfolioId|descrizione
Your mapping is wrong, try this:
public class Map_Profilo : FluentNHibernate.Mapping.ClassMap
{
public Map_Profilo()
{
Table("TBA_Profilo");
Id(x => x.Id).Column("id").GeneratedBy.Identity();
Map(x => x.Matricola)
.Column("matricola");
Map(x => x.Ruolo)
.Column("ruolo");
HasMany(x => x.ListaSedi)
.AsBag()
.KeyColumns.Add("codice_sede")
.Not.LazyLoad()
.Cascade.SaveUpdate();
}
}
public class Map_Sede : FluentNHibernate.Mapping.ClassMap
{
public Map_Sede()
{
Table("TBA_Sede");
Id(x => x.CodiceSede).Column("codice_sede").GeneratedBy.Assigned();
Map(x => x.DescrizioneSede)
.Column("descrizione");
References(prof => prof.Profilo)
.Column("codice_sede")
.Cascade.None()
.Inverse();
}
}
The key is, you need the parent profilio to save its child items. Have the child items do nothing to its parent. Also, your table diagram looks wrong, profolio should not have a key to sede, but sede should have a fk to profolio.