session and insert query builder progress

include/matador/query/insert_query_builder.hpp

@@ -83,7 +83,7 @@ public:
     visited_.clear();
 
     ptr_ = ptr;
-    build_for(ptr);
+    build_for(ptr, steps_);
     ptr_.reset();
 
     // relation inserts must run after all entity inserts were collected
@@ -119,9 +119,8 @@ public:
     has_many_linker<ObjectType> linker(ptr_, join_column);
     for (auto &obj : objects) {
       if (obj.is_transient()) {
-        build_for(obj);
+        build_for(obj, relation_steps_);
       }
-      // obj.is_persistent() ? build_for(obj) : on_foreign_object(obj, attr);
 
       access::process(linker, *obj);
     }
@@ -154,7 +153,7 @@ public:
       // Ensure target exists as dependency (deps first)
       if (!obj.is_persistent()) {
         using dep_t = std::remove_reference_t<decltype(*obj)>;
-        build_for<dep_t>(obj);
+        build_for<dep_t>(obj, steps_);
       }
 
       // Extract FK value from the foreign object
@@ -192,7 +191,7 @@ private:
   };
 
   template<class EntityType>
-  void build_for(const object::object_ptr<EntityType> &ptr) {
+  void build_for(const object::object_ptr<EntityType> &ptr, std::vector<insert_step> &steps) {
     if (!ptr) {
       return;
     }
@@ -239,7 +238,7 @@ private:
         step.pk_accessor.set(*ptr, id);
       };
     }
-    steps_.push_back(std::move(step));
+    steps.push_back(std::move(step));
   }
 
   template<class Pointer>
@@ -254,7 +253,7 @@ private:
     }
 
     using dep_t = std::remove_reference_t<decltype(*obj)>;
-    build_for<dep_t>(obj);
+    build_for<dep_t>(obj, steps_);
   }
 private:
   const basic_schema &schema_;