protected virtual Expression ApplyInclude(Expression source, IncludeExpression include, ResourceContext resourceContext)
{
using var lambdaScope = _lambdaScopeFactory.CreateScope(_elementType);
var builder = new IncludeClauseBuilder(source, lambdaScope, resourceContext, _resourceContextProvider);
return(builder.ApplyInclude(include));
}
public override Expression VisitCollectionNotEmpty(CollectionNotEmptyExpression expression, Type argument)
{
Expression property = Visit(expression.TargetCollection, argument);
Type elementType = CollectionConverter.TryGetCollectionElementType(property.Type);
if (elementType == null)
{
throw new InvalidOperationException("Expression must be a collection.");
}
Expression predicate = null;
if (expression.Filter != null)
{
var hasManyThrough = expression.TargetCollection.Fields.Last() as HasManyThroughAttribute;
var lambdaScopeFactory = new LambdaScopeFactory(_nameFactory, hasManyThrough);
using LambdaScope lambdaScope = lambdaScopeFactory.CreateScope(elementType);
var builder = new WhereClauseBuilder(property, lambdaScope, typeof(Enumerable), _nameFactory);
predicate = builder.GetPredicateLambda(expression.Filter);
}
return(AnyExtensionMethodCall(elementType, property, predicate));
}
private Expression CreateAssignmentRightHandSideForLayer(QueryLayer layer, LambdaScope outerLambdaScope, MemberExpression propertyAccess,
PropertyInfo selectorPropertyInfo, LambdaScopeFactory lambdaScopeFactory)
{
Type collectionElementType = TypeHelper.TryGetCollectionElementType(selectorPropertyInfo.PropertyType);
Type bodyElementType = collectionElementType ?? selectorPropertyInfo.PropertyType;
if (collectionElementType != null)
{
return(CreateCollectionInitializer(outerLambdaScope, selectorPropertyInfo, bodyElementType, layer, lambdaScopeFactory));
}
if (layer.Projection == null || !layer.Projection.Any())
{
return(propertyAccess);
}
using var scope = lambdaScopeFactory.CreateScope(bodyElementType, propertyAccess);
return(CreateLambdaBodyInitializer(layer.Projection, layer.ResourceContext, scope, true));
}
