set up unfonctionnal rework, TODO -> pricing separation

models/resources/purchase_resource/purchase_resource.go

@@ -0,0 +1,30 @@
+package purchase_resource
+
+import (
+	"time"
+
+	"cloud.o-forge.io/core/oc-lib/models/utils"
+	"cloud.o-forge.io/core/oc-lib/tools"
+)
+
+type PurchaseResource struct {
+	utils.AbstractObject
+	EndDate      *time.Time     `json:"end_buying_date,omitempty" bson:"end_buying_date,omitempty"`
+	ResourceID   string         `json:"resource_id" bson:"resource_id" validate:"required"`
+	ResourceType tools.DataType `json:"resource_type" bson:"resource_type" validate:"required"`
+}
+
+func (d *PurchaseResource) GetAccessor(request *tools.APIRequest) utils.Accessor {
+	return NewAccessor(request) // Create a new instance of the accessor
+}
+
+func (r *PurchaseResource) CanUpdate(set utils.DBObject) (bool, utils.DBObject) {
+	return r.IsDraft, set // only draft buying can be updated
+}
+
+func (r *PurchaseResource) CanDelete() bool { // ENDBuyingDate is passed
+	if r.EndDate != nil {
+		return time.Now().UTC().After(*r.EndDate)
+	}
+	return false // only draft bookings can be deleted
+}