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Lidarr/NzbDrone.Core/Datastore/RelationshipExtensions.cs

50 lines
1.8 KiB

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 RelationshipBuilder<TParent> relationshipBuilder, Expression<Func<TParent, LazyLoaded<TChild>>> portalExpression, Func<TParent, int> childIdSelector)
where TParent : ModelBase
where TChild : ModelBase
{
return relationshipBuilder.For(portalExpression.GetMemberName())
.LazyLoad((db, parent) => db.Query<TChild>()
.Single(c => c.Id == childIdSelector(parent)));
}
public static RelationshipBuilder<TParent> Relationship<TParent>(this ColumnMapBuilder<TParent> mapBuilder)
{
return mapBuilder.Relationships.AutoMapComplexTypeProperties<ILazyLoaded>();
}
public static RelationshipBuilder<TParent> HasMany<TParent, TChild>(this RelationshipBuilder<TParent> relationshipBuilder, Expression<Func<TParent, LazyList<TChild>>> portalExpression, Func<TParent, int> childIdSelector)
where TParent : ModelBase
where TChild : ModelBase
{
return relationshipBuilder.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;
}
}
}