/// We compile each entityQuery with EqlCompiler and build a Select call from the fields
public override IGraphQLNode VisitEntityQuery(EntityGraphQLParser.EntityQueryContext context)
{
string name;
string query;
if (context.alias != null)
{
name = context.alias.name.GetText();
query = context.entity.GetText();
}
else
{
query = context.entity.GetText();
name = query;
if (name.IndexOf(".") > -1)
{
name = name.Substring(0, name.IndexOf("."));
}
if (name.IndexOf("(") > -1)
{
name = name.Substring(0, name.IndexOf("("));
}
}
try
{
QueryResult result = null;
if (selectContext == null)
{
// top level are queries on the context
result = EqlCompiler.Compile(query, schemaProvider, methodProvider, variables);
}
else
{
result = EqlCompiler.CompileWith(query, selectContext, schemaProvider, methodProvider, variables);
}
var exp = result.LambdaExpression.Body;
IGraphQLNode graphQLNode = null;
if (exp.Type.IsEnumerable())
{
graphQLNode = BuildDynamicSelectOnCollection(result, name, context, true);
}
else
{
// Could be a list.First() that we need to turn into a select, or
// other levels are object selection. e.g. from the top level people query I am selecting all their children { field1, etc. }
// Can we turn a list.First() into and list.Select().First()
var listExp = Compiler.Util.ExpressionUtil.FindIEnumerable(result.LambdaExpression.Body);
if (listExp.Item1 != null)
{
// yes we can
graphQLNode = BuildDynamicSelectOnCollection(new QueryResult((ExpressionResult)listExp.Item1, result.ContextParams, result.ConstantParameterValues), name, context, true);
graphQLNode.NodeExpression = (ExpressionResult)Compiler.Util.ExpressionUtil.CombineExpressions(graphQLNode.NodeExpression, listExp.Item2);
}
else
{
graphQLNode = BuildDynamicSelectForObjectGraph(query, name, context, result);
}
}
// the query result may be a mutation
if (result.IsMutation)
{
return(new GraphQLMutationNode(result, graphQLNode));
}
return(graphQLNode);
}
catch (EntityGraphQLCompilerException ex)
{
throw SchemaException.MakeFieldCompileError(query, ex.Message);
}
}
