select support sorting by projected members

Author: Ihar Yakimush

SolrNet.Linq.IntegrationTests/SelectTests.cs

@@ -48,10 +48,16 @@ public void Product2()
                     Assert.Equal("Id:id", qo.Fields.ElementAt(1));
                     Assert.Equal("Price:price", qo.Fields.ElementAt(2));
                     Assert.Equal("Categories:cat", qo.Fields.ElementAt(3));
+
+                    Assert.Equal(3, qo.OrderBy.Count);
+                    Assert.Equal("id", qo.OrderBy.ElementAt(0).FieldName);
+                    Assert.Equal("pow(2,2)", qo.OrderBy.ElementAt(1).FieldName);
+                    Assert.Equal("pow(2,3)", qo.OrderBy.ElementAt(2).FieldName);
+                    
                 }).Where(p => p.Id != null)
                 .Select(p => new Product2 {Id = p.Id, Price = p.Price, Categories = p.Categories, Qwe = Math.Pow(2, 2)})
                 .Where(arg => arg.Categories.Any(s => s == "electronics"))
-                .OrderBy(arg => arg.Id)
+                .OrderBy(arg => arg.Id).ThenBy(arg => arg.Qwe).ThenBy(arg => Math.Pow(2,3))
                 .FirstOrDefault();
 
             Assert.NotNull(t1);

SolrNet.Linq/Expressions/Context/SelectContext.cs

@@ -65,6 +65,11 @@ public override string GetSolrMemberProduct(Expression expression, bool disableF
                 {
                     return Members[me.Member];
                 }
+
+                if (Aliases.ContainsKey(me.Member) && disableFunctions == false)
+                {
+                    return Aliases[me.Member];
+                }
             }
 
             return expression.GetSolrMemberProduct(this, disableFunctions);