Migrate a plone site with an extra mountpoint to regular structure - collective.exportimport

Plone Support Add-on Development
1

I would migrate a Plone 4 Site to Plone 6 with Classic UI. The old Plone 4 is mounted via an extra mountpoint. in the export json is see the id field and the parent id field with the full path

@id	"http://127.0.0.1:8080/mount/site/de/...."

i would like to import all data in a regular installation without an extra mountpoint. the ids should be switched to

http://127.0.0.1:8080/site/de/....

where is the right place to modify the ids? in the export or the import? should i use the global_dict_hook ?

My first attempt with collective.exportimport, sorry for my stupid question.

Update: i fix it in the custom import script

def global_dict_hook(self, item):
    
    # fix mount point
    item["@id"] = item["@id"].replace("/mount/site","/site")
    item["parent"]["@id"] = item["parent"]["@id"].replace("/mount/site","/site")

    # fix wrong id
    item["@id"] = item["@id"].replace("%20","-")
    item["parent"]["@id"] = item["parent"]["@id"].replace("%20","-")

    # fix empty creators
    creators = item["creators"]
    new_creators = []
    for creator in creators:
        if len(creator) > 0:
            new_creators.append(creator)
    if len(new_creators) == 0:
        new_creators.append("admin")
    item["creators"] = new_creators

    return item
2

This is a general question: fix things on export or import?

My general approach is fixing things at import time and leave the export of the source system as-is.

You only want to maintain changes only in one place…you usually work on the migration import in order to get the data right…so I would recommend making such changes always on the import side.

3

i decide me to the same approach, “fix things on import”

4

we did that several times and it works nice. Use a custom import-content view and do it in global_dict_hook() like this:


# path fix
item["@original_id"] = item["@id"]
item["@id"] = item["@id"].replace(old_path, new_path)
item["parent"]["@original_id"] = item["parent"]["@id"]
item["parent"]["@id"] = item["parent"]["@id"].replace(old_path, new_path)

two things:

  1. you need to change the parent’s id of the item too !
  2. as a convenience we’ve saved the original path too and stored it in some “import” annotation on the new object (not covered in this post). but that’s up to you

EDIT: of course you need to be careful, when replacing the path … better parse the url with urllib before and catch special cases like /mountpoint/plonesite/subfolder/mountpoint/ in your replace.

EDIT 2: I should have read your post till the end :wink: you already provided the solution