many to many query progress (multiple joins)

test/CMakeLists.txt

@@ -39,7 +39,8 @@ add_executable(tests
   EntityQueryBuilderTest.cpp
   models/author.hpp
   models/book.hpp
-  FieldTest.cpp)
+  FieldTest.cpp
+  models/recipe.hpp)
 
 target_link_libraries(tests PRIVATE
   Catch2::Catch2WithMain

test/models/recipe.hpp

@@ -0,0 +1,55 @@
+#ifndef QUERY_RECIPE_HPP
+#define QUERY_RECIPE_HPP
+
+#include "matador/utils/access.hpp"
+#include "matador/utils/field_attributes.hpp"
+#include "matador/utils/foreign_attributes.hpp"
+
+#include "matador/sql/entity.hpp"
+
+#include <string>
+
+namespace matador::test {
+
+struct ingredient
+{
+  unsigned long id{};
+  std::string name;
+
+  template<class Operator>
+  void process(Operator &op) {
+    namespace field = matador::utils::access;
+    field::primary_key(op, "id", id);
+    field::attribute(op, "name", name, 255);
+  }
+};
+
+struct recipe
+{
+  unsigned long id{};
+  std::string name;
+
+  template<class Operator>
+  void process(Operator &op) {
+    namespace field = matador::utils::access;
+    field::primary_key(op, "id", id);
+    field::attribute(op, "name", name, 255);
+  }
+};
+
+struct recipe_ingredient
+{
+  sql::entity<recipe> recipe_;
+  sql::entity<ingredient> ingredient_;
+
+  template<class Operator>
+  void process(Operator &op) {
+    namespace field = matador::utils::access;
+    field::belongs_to(op, "recipe_id", recipe_, utils::default_foreign_attributes);
+    field::belongs_to(op, "ingredient_id", ingredient_, utils::default_foreign_attributes);
+  }
+};
+
+}
+
+#endif //QUERY_RECIPE_HPP