public Expression HandleLeave(
SelectionVisitorContext context,
IFieldSelection selection,
Expression expression)
{
var argumentName = context.SelectionContext.FilterArgumentName;
if (context.TryGetValueNode(argumentName, out IValueNode? filter) &&
selection.Field.Arguments[argumentName].Type is InputObjectType iot &&
iot is IFilterInputType fit)
{
var visitorContext = new QueryableFilterVisitorContext(
iot, fit.EntityType, context.Conversion, false);
QueryableFilterVisitor.Default.Visit(filter, visitorContext);
return(Expression.Call(
typeof(Enumerable),
"Where",
new[] { fit.EntityType },
expression,
visitorContext.CreateFilter()));
}
return(expression);
}
public Expression HandleLeave(
SelectionVisitorContext context,
IFieldSelection selection,
Expression expression)
{
if (context.TryGetValueNode(ArgumentName, out IValueNode sortArgument) &&
selection.Field.Arguments[ArgumentName].Type is InputObjectType iot &&
iot is ISortInputType fit)
{
var visitor = new QueryableSortVisitor(iot, fit.EntityType);
sortArgument.Accept(visitor);
return(visitor.Compile(expression));
}
return(expression);
}
public Expression HandleLeave(
SelectionVisitorContext context,
IFieldSelection selection,
Expression expression)
{
var argumentName = context.SelectionContext.SortingArgumentName;
if (context.TryGetValueNode(argumentName, out IValueNode? sortArgument) &&
selection.Field.Arguments[argumentName].Type is InputObjectType iot &&
iot is ISortInputType fit)
{
var visitorContext = new QueryableSortVisitorContext(
iot, fit.EntityType, false);
QueryableSortVisitor.Default.Visit(sortArgument, visitorContext);
return(visitorContext.Compile(expression));
}
return(expression);
}
public Expression HandleLeave(
SelectionVisitorContext context,
IFieldSelection selection,
Expression expression)
{
IFilterConvention convention = context.SelectionContext.FilterConvention;
NameString argumentName = convention.GetArgumentName();
if (context.TryGetValueNode(argumentName, out IValueNode? filter) &&
selection.Field.Arguments[argumentName].Type is InputObjectType iot &&
iot is IFilterInputType fit &&
convention.TryGetVisitorDefinition(
out FilterExpressionVisitorDefinition? defintion))
{
var visitorContext = new QueryableFilterVisitorContext(
iot,
fit.EntityType,
defintion,
context.Conversion,
false);
QueryableFilterVisitor.Default.Visit(filter, visitorContext);
if (visitorContext.TryCreateLambda(
out LambdaExpression? filterExpression))
{
return(Expression.Call(
typeof(Enumerable),
nameof(Enumerable.Where),
new[] { fit.EntityType },
expression,
filterExpression));
}
else
{
context.ReportErrors(visitorContext.Errors);
}
}
return(expression);
}
public Expression HandleLeave(
SelectionVisitorContext context,
IFieldSelection selection,
Expression expression)
{
if (context.TryGetValueNode("where", out IValueNode filter) &&
selection.Field.Arguments["where"].Type is InputObjectType iot &&
iot is IFilterInputType fit)
{
var visitor = new QueryableFilterVisitor(
iot, fit.EntityType, context.Conversion);
filter.Accept(visitor);
return(Expression.Call(
typeof(Enumerable),
"Where",
new[] { fit.EntityType },
expression,
visitor.CreateFilter()));
}
return(expression);
}