45 lines
1.8 KiB
C#
45 lines
1.8 KiB
C#
using System;
|
|
using System.Linq;
|
|
using System.Linq.Expressions;
|
|
using Marr.Data;
|
|
using Marr.Data.Mapping;
|
|
|
|
namespace NzbDrone.Core.Datastore
|
|
{
|
|
public static class RelationshipExtensions
|
|
{
|
|
public static RelationshipBuilder<TParent> HasOne<TParent, TChild>(this ColumnMapBuilder<TParent> columnMapBuilder, Expression<Func<TParent, LazyLoaded<TChild>>> portalExpression, Func<TParent, int> childIdSelector)
|
|
where TParent : ModelBase
|
|
where TChild : ModelBase
|
|
{
|
|
return columnMapBuilder.Relationships.AutoMapComplexTypeProperties<ILazyLoaded>()
|
|
.For(portalExpression.GetMemberName())
|
|
.LazyLoad((db, parent) => db.Query<TChild>().Single(c => c.Id == childIdSelector(parent)));
|
|
|
|
|
|
}
|
|
|
|
public static RelationshipBuilder<TParent> HasMany<TParent, TChild>(this ColumnMapBuilder<TParent> columnMapBuilder, Expression<Func<TParent, LazyList<TChild>>> portalExpression, Func<TParent, int> childIdSelector)
|
|
where TParent : ModelBase
|
|
where TChild : ModelBase
|
|
{
|
|
return columnMapBuilder.Relationships.AutoMapComplexTypeProperties<ILazyLoaded>()
|
|
.For(portalExpression.GetMemberName())
|
|
.LazyLoad((db, parent) => db.Query<TChild>().Where(c => c.Id == childIdSelector(parent)).ToList());
|
|
|
|
|
|
}
|
|
|
|
private static string GetMemberName<T, TMember>(this Expression<Func<T, TMember>> member)
|
|
{
|
|
var expression = member.Body as MemberExpression;
|
|
|
|
if (expression == null)
|
|
{
|
|
expression = (MemberExpression)((UnaryExpression)member.Body).Operand;
|
|
}
|
|
|
|
return expression.Member.Name;
|
|
}
|
|
}
|
|
} |