When I save a document that has a generic type DataView<Customer>, I'm manually setting the collection name to "customers". However, I'm having some trouble making an index using AbstractIndexCreationTask with a non-default collection name. Here's my index:
public class customers_Search
: AbstractIndexCreationTask<DataView<Customer>, customers_Search.Result>
{
public class Result
{
public string Query { get; set; }
}
public customers_Search()
{
Map = customers =>
from customer in customers
where customer.Data != null
select new
{
Query = AsDocument(customer.Data).Select(x => x.Value)
};
Index(x => x.Query, FieldIndexing.Analyzed);
}
}
When this gets deployed, it looks like this:
from customer in docs.DataViewOfCustomer
where customer.Data != null
select new {
Query = customer.Data.Select(x => x.Value)
}
This doesn't work obviously, and if I change DataViewOfCustomer to "customers" it works just fine.
I'd rather not have to use non-type-checked (string) indexes to deploy. Is there a way to set the collection name that from the AbstractIndexCreationTask class?
Update
Since my data class is generic, I made a generic index which fixes up the names.
public class DataViewQuery<TEntity>
: AbstractIndexCreationTask<DataView<TEntity>, DataViewQueryResult>
{
private readonly string _entityName;
private readonly string _indexName;
// this is to fix the collection name for the index name
public override string IndexName { get { return _indexName; } }
// this is to fix the collection name for the index query
public override void Execute(IDatabaseCommands databaseCommands, DocumentConvention documentConvention)
{
var conventions = documentConvention.Clone();
conventions.FindTypeTagName =
type =>
typeof(DataView<TEntity>) == type
? _entityName
: documentConvention.FindTypeTagName(type);
base.Execute(databaseCommands, conventions);
}
public DataViewQuery(string entityName)
{
_entityName = entityName;
_indexName = String.Format("{0}/{1}", entityName, "Query");
Map = items =>
from item in items
where item.Data != null
select new
{
Query = AsDocument(item.Data).Select(x => x.Value)
};
Index(x => x.Query, FieldIndexing.Analyzed);
}
}
public class DataViewQueryResult
{
public string Query { get; set; }
}
Then I can create a specific index which has all the configuration in it.
// sets the collection type (DataView<Customer>) for the index
public class CustomerQuery : DataViewQuery<Customer>
{
// sets the collection name for the index
public CustomerQuery() : base(EntityName.Customers) { }
}
You need to configure this in the conventions.
The property to configure is FindTypeTagName
Related
I have a Model with a property of a value object type as following:
public class Course : AggregateRoot, ISpModel
{
...
public UnsignedNumber MaximumCapacity { get; private set; }
...
}
with UnsignedNumber being a value object containing a short value:
public class UnsignedNumber : BaseValueObject<UnsignedNumber>
{
public short Value { get; }
...
}
What I need to do is to sum all the MaximumCapacities of courses which correspond with certain conditions, but when I try to add a SumAsync(x => x.MaximumCapacity) at the end of the query, I get a syntax error
the syntax error
and when I try to do the same with it's value, I get a linq error in runtime.
"The LINQ expression '(int)(EntityShaperExpression: \r\n EntityType: Course\r\n ValueBufferExpression: \r\n (ProjectionBindingExpression: Outer)\r\n IsNullable: False\r\n).MaximumCapacity.Value' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to either AsEnumerable(), AsAsyncEnumerable(), ToList(), or ToListAsync(). See https://go.microsoft.com/fwlink/?linkid=2101038 for more information."
Edit:
Here's the Linq Expression that encounters the problem:
var query = _dbContext.Courses.AsQueryable();
query = query.Include(x => BunchOfIncludes(x));
var res = await query.Where(x => BunchOfClauses(x)).SumAsync(x => x.MaximumCapacity.Value);
Edit2: the classes mentioned above:
public abstract class AggregateRoot : Entity
{
private readonly List<IDomainEvent> _events;
protected AggregateRoot() => _events = new List<IDomainEvent>();
public AggregateRoot(IEnumerable<IDomainEvent> events)
{
if (events == null) return;
foreach (var #event in events)
((dynamic)this).On((dynamic)#event);
}
protected void AddEvent(IDomainEvent #event) => _events.Add(#event);
public IEnumerable<IDomainEvent> GetEvents() => _events.AsEnumerable();
public void ClearEvents() => _events.Clear();
}
public interface ISpModel
{
}
public abstract class BaseValueObject<TValueObject> : IEquatable<TValueObject>
where TValueObject : BaseValueObject<TValueObject>
{
...
public static bool operator ==(BaseValueObject<TValueObject> right, BaseValueObject<TValueObject> left)
{
if (right is null && left is null)
return true;
if (right is null || left is null)
return false;
return right.Equals(left);
}
...
}
I'm using RavenDB 2.5 and what I want to do is query a Group (see below) providing a valid Lucene search term and get back a collection of Member instances (or even just Ids) that match. So, class definition:
public class Group {
public string Id { get; set; }
public IList<Member> Members { get; set; }
}
public class Member {
public string Name { get; set; }
public string Bio { get; set; }
}
And they are stored in the database as session.Store(groupInstance); as you'd expect. What I'd like to do is query and return the Member instances which match a given search term.
So, something like:
public class GroupMembers_BySearchTerm : AbstractIndexCreationTask {
public override IndexDefinition CreateIndexDefinition(){
return new IndexDefinition {
Map = "from g in docs.Groups select new { Content = new [] { g.Members.Select(m => m.Name), g.Members.Select(m => m.Bio) }, Id = g.Id }",
Indexes = { { "Id", FieldIndexing.Default }, { "Content", FieldIndexing.Analyzed } }
}
}
}
If I call this using something like:
session.Advanced.LuceneQuery<Group, GroupMembers_BySearchTerm>().Where("Id: myId AND Content: search terms").ToList();
I obviously get back a Group instance, but how can I get back the Members instead?
What about an index like this:
public class Members_BySearchTermAndGroup : AbstractIndexCreationTask {
public override IndexDefinition CreateIndexDefinition(){
return new IndexDefinition {
Map = "from g in docs.Groups
from member in g.Members
select new {
GroupdId = g.Id,
Name = member.Name,
Bio = member.Bio,
Content = new [] {member.Name, member.Bio },
}",
Indexes = {
{ "GroupId", FieldIndexing.Default },
{ "Content", FieldIndexing.Analyzed }
},
Stores = {
{ "Name", FieldStorage.Yes },
{ "Bio", FieldStorage.Yes }
}
}
}
}
If you take a closer look you'll see that we are creating a new lucene entry for each member inside of a group. Consequently, you'll be able to query on those elements and retrieve them.
Finally you can query your store like this (more info about searching):
session.Query<Member, Members_BySearchTermAndGroup>()
.Search(x => x.Content, "search terms")
.ProjectFromIndexFieldsInto<Member>()
.ToList();
I cannot check this right now but I guess that you need to project your results using the ProjectFromIndexFieldsInto(). Some more information about projections in this link.
or, following your example:
session.Advanced
.LuceneQuery<Member, Members_BySearchTermAndGroup>()
.Where("GroupId: myId AND Content: search terms")
.SelectFields<Member>()
.ToList();
I'm trying to specify a unique column for an entity, using the Fluent NHibernate Automapper Override. For my test class of CodeType, I'd like to make the Type property unique. The goal would be for a "new CodeType()" being created with the same type field as a currently saved CodeType to be overlaid on top of the current entity.
I have the following CodeType class:
public class CodeType : SecurableEntity
{
public virtual string Type { get; set; }
public virtual string Description { get; set; }
/// <summary>
/// This is a placeholder constructor for NHibernate.
/// A no-argument constructor must be available for NHibernate to create the object.
/// </summary>
public CodeType() { }
}
I have the following CodeTypeMap Class:
public class CodeTypeMap : IAutoMappingOverride<CodeType>
{
public void Override(AutoMapping<CodeType> mapping)
{
//Doesn't work. Need a way to specify a column as unique.
mapping.Map(m => m.Type).Unique();
}
}
The override is applied to the AutoMap, through the following:
public AutoPersistenceModel Generate()
{
var mappings = AutoMap.AssemblyOf<User>(new AutomappingConfiguration());
mappings.IgnoreBase<Entity>();
mappings.IgnoreBase<SecurableEntity>();
mappings.IgnoreBase(typeof(EntityWithTypedId<>));
mappings.Conventions.Setup(GetConventions());
mappings.UseOverridesFromAssemblyOf<AutoPersistenceModelGenerator>();
mappings.UseOverridesFromAssemblyOf<UserMap>();
mappings.UseOverridesFromAssemblyOf<CodeMap>();
mappings.UseOverridesFromAssemblyOf<CodeTypeMap>();
return mappings;
}
I'd like the following code to update any existing record with "type" equal to "existingType".
SecurableEntityRepository<CodeType> ctr = new SecurableEntityRepository<CodeType>();
CodeType ct = new CodeType();
ct.type = "existingType";
ct = ctr.SaveOrUpdate(ct);
How can I make NHibernate key off of the type field as unique?
Is this possible?
short answer, what you want is something you have to handle in code because there are so many possibilities. Everytime you create a new CodeType you have to check the db if there is already one
SecurableEntityRepository<CodeType> ctr = new SecurableEntityRepository<CodeType>();
CodeType ct = ctr.GetByType("existingType");
if (ct == null)
{
ct = new CodeType { type = "existingType" };
}
ctr.SaveOrUpdate(ct);
or
SecurableEntityRepository<CodeType> ctr = new SecurableEntityRepository<CodeType>();
CodeType ct = ctr.GetByType("existingType");
if (ct != null)
{
ctr.Detach(ct);
ctr.Merge(new CodeType{ type = "existingType" });
}
or
SecurableEntityRepository<CodeType> ctr = new SecurableEntityRepository<CodeType>();
int ctId = ctr.GetIdByType("existingType");
if (ct != 0)
{
ctr.Merge(new CodeType{ Id = ctId, type = "existingType" });
}
and there are some things which can be written differently
public CodeType() { } can be removed or made protected CodeType() { } if not needed for your domain
public AutoPersistenceModel Generate()
{
return AutoMap.AssemblyOf<User>(new AutomappingConfiguration())
.IgnoreBase<Entity>()
.IgnoreBase<SecurableEntity>()
.IgnoreBase(typeof(EntityWithTypedId<>))
.Conventions.Setup(GetConventions())
.UseOverridesFromAssemblyOf<AutoPersistenceModelGenerator>();
}
All of my entities and value objects implement marker interfaces IEntity and IValueObject. I have set them up to be treated as components like so:
public override bool IsComponent(Type type)
{
return typeof(IValueObject).IsAssignableFrom(type);
}
public override bool ShouldMap(Type type)
{
return typeof(IEntity).IsAssignableFrom(type) || typeof(IValueObject).IsAssignableFrom(type);
}
Unfortunately, this does not seem to allow entities that have collections of value objects to be automapped as component collections. For example:
public class MyEntity : IEntity
{
public IList<MyValueObject> Objects { get; set; }
}
public class MyValueObject : IValueObject
{
public string Name { get; set; }
public string Value { get; set; }
}
Is there any way to define a convention such that, any time an IEntity has an IList of a type that implements IValueObject, it gets mapped as if I had specified:
HasMany(x => x.Objects)
.Component(x => {
x.Map(m => m.Name);
x.Map(m => m.Value);
});
What I don't want to do is have to manually do these overrides for every class and write out each property for the value object again and again.
Create a new class that inherits from HasManyStep (FluentNHibernate.Automapping.Steps).
Override the ShouldMap() method with something like :
return base.ShouldMap(member) && IsCollectionOfComponents(member)
Add your logic to :
public void Map(ClassMappingBase classMap, Member member)
{ ... }
Replace the default step with your new one :
public class MyMappingConfiguration : DefaultAutomappingConfiguration
{
public override IEnumerable<IAutomappingStep> GetMappingSteps(AutoMapper mapper, IConventionFinder conventionFinder)
{
var steps = base.GetMappingSteps(mapper, conventionFinder);
var finalSteps = steps.Where(c => c.GetType() != typeof(FluentNHibernate.Automapping.Steps.HasManyToManyStep)).ToList();
var idx = finalSteps.IndexOf(steps.Where(c => c.GetType() == typeof(PropertyStep)).First());
finalSteps.Insert(idx + 1, new MyCustomHasManyStep(this));
return finalSteps;
}
}
Note : You could also get the original source code of HasManyStep.cs and copy it to your project to introduce your custom logic.
I'm trying to map int IdPost on DTO to Post object on Blog object, based on a rule.
I would like to achieve this: BlogDTO.IdPost => Blog.Post
Post would be loaded by NHibernate: Session.Load(IdPost)
How can I achieve this with AutoMapper?
You could define AfterMap action to load entities using NHibernate in your mapping definition. I'm using something like this for simmilar purpose:
mapperConfiguration.CreateMap<DealerDTO, Model.Entities.Dealer.Dealer>()
.AfterMap((src, dst) =>
{
if (src.DepartmentId > 0)
dst.Department = nhContext.CurrentSession.Load<CompanyDepartment>(src.DepartmentId);
if (src.RankId > 0)
dst.Rank = nhContext.CurrentSession.Load<DealerRank>(src.RankId);
if (src.RegionId > 0)
dst.Region = nhContext.CurrentSession.Load<Region>(src.RegionId);
});
you can do this easily with the ValueInjecter
it would be something like this:
//first you need to create a ValueInjection for your scenario
public class IntToPost : LoopValueInjection<int, Post>
{
protected override Post SetValue(int sourcePropertyValue)
{
return Session.Load(sourcePropertyValue);
}
}
// and use it like this
post.InjectFrom(new IntToPost().SourcePrefix("Id"), postDto);
also if you always have the prefix Id than you could set it in the constructor of the IntToPost
and use it like this:
post.InjectFrom<IntToPost>(postDto);
Create a new Id2EntityConverter
public class Id2EntityConverter<TEntity> : ITypeConverter<int, TEntity> where TEntity : EntityBase
{
public Id2EntityConverter()
{
Repository = ObjectFactory.GetInstance<Repository<TEntity>>();
}
private IRepository<TEntity> Repository { get; set; }
public TEntity ConvertToEntity(int id)
{
var toReturn = Repository.Get(id);
return toReturn;
}
#region Implementation of ITypeConverter<int,TEntity>
public TEntity Convert(ResolutionContext context)
{
return ConvertToEntity((int)context.SourceValue);
}
#endregion
}
Configure AM to auto create maps for each type
public class AutoMapperGlobalConfiguration : IGlobalConfiguration
{
private AutoMapper.IConfiguration _configuration;
public AutoMapperGlobalConfiguration(IConfiguration configuration)
{
_configuration = configuration;
}
public void Configure()
{
//add all defined profiles
var query = this.GetType().Assembly.GetExportedTypes()
.Where(x => x.CanBeCastTo(typeof(AutoMapper.Profile)));
_configuration.RecognizePostfixes("Id");
foreach (Type type in query)
{
_configuration.AddProfile(ObjectFactory.GetInstance(type).As<Profile>());
}
//create maps for all Id2Entity converters
MapAllEntities(_configuration);
Mapper.AssertConfigurationIsValid();
}
private static void MapAllEntities(IProfileExpression configuration)
{
//get all types from the my assembly and create maps that
//convert int -> instance of the type using Id2EntityConverter
var openType = typeof(Id2EntityConverter<>);
var idType = typeof(int);
var persistentEntties = typeof(MYTYPE_FROM_MY_ASSEMBLY).Assembly.GetTypes()
.Where(t => typeof(EntityBase).IsAssignableFrom(t))
.Select(t => new
{
EntityType = t,
ConverterType = openType.MakeGenericType(t)
});
foreach (var e in persistentEntties)
{
var map = configuration.CreateMap(idType, e.EntityType);
map.ConvertUsing(e.ConverterType);
}
}
}
Pay attention to MapAllEntities method. That one will scan all types and create maps on the fly from integer to any type that is of EntityBase (which in our case is any persistent type).
RecognizePostfix("Id") in your case might be replace with RecognizePrefix("Id")