public OAssociationFilterExpression(IdentifiableAlias alias, AssociationOrigin origin, Type type, Expression source, Expression predicate)
: base((DbExpressionType)ODbExpressionType.AssociationFilter, type, alias)
{
Source = source;
Predicate = predicate;
Origin = origin;
}
private Expression BindAssociationFilter(AssociationOrigin origin, Type type, Expression source, LambdaExpression predicate)
{
var TAssociation = predicate.Parameters[0].Type;
var sourceMember = Expression.MakeMemberAccess(
predicate.Parameters[0],
TAssociation.GetPublicProperty(origin.ToString()));
var sourceEquals = Expression.Equal(Expression.Constant(source), sourceMember);
var lambdaType = predicate.Type;
var sourcePredicate = Expression.Lambda(lambdaType, sourceEquals, predicate.Parameters);
var completePredicate = Expression.Lambda(
lambdaType,
Expression.And(sourcePredicate.Body, predicate.Body),
predicate.Parameters);
ProjectionExpression projection = this.VisitSequence(
this.Mapper.GetQueryExpression(
this.Mapper.Mapping.GetEntity(type.GetGenericArguments()[0], this.RepositoryType)));
this.Map[predicate.Parameters[0]] = projection.Projector;
Expression where = this.Visit(predicate.Body);
var alias = this.GetNextAlias();
ProjectedFields pc = this.ProjectFields(projection.Projector, alias, projection.Select.Alias);
return new ProjectionExpression(
new SelectExpression(alias, pc.Fields, projection.Select, where),
pc.Projector
);
}
