Creation of a TagHierarchies with its tags in a single shot

[jmgimeno]

One problem with the creation of TagHierarchies and Tags that we have until now is that is very difficult to check if the tags associated to a hierarchy form a tree (well, a forest because we can have many roots) considering the parent/child relationship between tags.

The new alternative way to create a TagHierarchy will be by making a POST to a new endpoint "/quickTagHierarchyCreation" (the name is temporary and we are open to suggestions, with a payload of JSON with this format:

{ "name" : "tagHierarchy1",
  "roots" : [
    { "name" : "tag1",
       "children" : [
            {"name" : "tag2",
              "children" : [
                  ...
               ]
            },
            ...
        ]
    }
    , ...
  ]
}

Now, in a single shot, we have enough information to:

• Check if the TagHierarchy's name is valid
• Check if the tags form a forest (one or many trees)
• Create the new TagHierrachy
• Create all the new tags
• Link the tags to the hierarchy
• Link each non-root tag to its parent