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https://github.com/collective/collective.relationhelpers

Helpers to manage, create, export and rebuild relations in Plone 5.x. For Plone 6 this was merged into Plone core.
https://github.com/collective/collective.relationhelpers

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Helpers to manage, create, export and rebuild relations in Plone 5.x. For Plone 6 this was merged into Plone core.

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README 

        
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==========================

collective.relationhelpers

==========================



Helpers to manage, create, export, inspect and rebuild relations in Plone



To learn more about relations read https://training.plone.org/5/mastering-plone/relations.html



Features

========



Dealing with relations on individual objects

--------------------------------------------



**Convenience methods:**



``relations(obj, attribute=None, as_dict=False)``

    Get related objects.



``unrestricted_relations(obj, attribute=None, as_dict=False)``

    Get related objects without permission checks.



``backrelations(obj, attribute=None, as_dict=False)``

    Get objects with a relation to this object.



``unrestricted_backrelations(obj, attribute=None, as_dict=False)``

    Get objects with a relation to this object without permission checks.



``relation(obj, attribute)``

    Get related object. This is only valid if the attribute is the name of a relationChoice field on the object.



``unrestricted_relation(obj, attribute)``

    Get related object without permission checks. See relation



``backrelation(obj, attribute)``

    Get relating object. This only makes sense when one item has a relation of this type to the obj.

    One example is parent -> child where only one parent can exist.



``unrestricted_backrelation(obj, attribute)``

    Get relating object without permission checks. See backrelation



``relapi.link_objects(source, target, relationship)``

    Link objects: Create a relation between two objects using the specified relationship.

    From the parameter ``relationship`` the method will find out what kind of relationship you want to create (RelationChoice, RelationList) by inspecting the schema-field on the source-object.

    The method also works for linkintegrity-relations and relations between working-copies.



    Example: To use the default-behavior ``plone.relateditems`` use the field-name ``relatedItems`` as relationship: ``relapi.link_objects(obj, anotherobj, 'relatedItems')``.



**Main method to get all kinds of relations:**



``relapi.get_relations(obj, attribute=None, backrels=False, restricted=True, as_dict=False)``

    Get a list of incoming or outgoing relation for a specific content object.



    If you pass a attribute you only get relations of that type. This is the same as the fieldname on the source-object and the ``from_attribute`` on a RelationValue. You can also pass a list if attributes to get relations of certain types.



    By default the result is a list of objects. If you set as_dict=True it will return a dict with the names of the relations as keys and lists of objects as values.



Dealing with all relations at once

----------------------------------



Especially during migrations (e.g. between Archetypes and Dexteriy or from Python 2 to 3) you need to deal with all relations at once.

For example the relation-catalog and the intid-catalog could hold references to broken or removes objects.



First import the api: ``from collective.relationhelpers import api as relapi``



``relapi.rebuild_relations()``

    Rebuild all relations using the same code as the form ``@@rebuild-relations``



``relapi.get_all_relations()``

    Get all relations as a list of dicts.



``relapi.export_relations()``

    Export all relations as a json file ``all_relations.json`` in you buildout directory.



``relapi.store_relations()``

    Export all relations and store them as a annotation on the portal ``IAnnotations(portal)['ALL_REFERENCES']``.



``relapi.cleanup_intids()``

    Purge all RelationValues and all references to broken objects from the IntId catalog.



``relapi.get_relations_stats()``

    Log information on all existing relations



``relapi.restore_relations(all_relations=None)``

    Recreate relations from a annotation on the portal or a list of dicts (e.g. restored from the json-file created by ``export_relations``).

    This works fine for all kinds of relations, RelationList- or RelationChoice-fields (including the default field "Related Items") as well as for linkintegrity-relations and relations between working-copies.



Rebuild all relations

---------------------



There is a form ``http://localhost:8080/Plone/@@rebuild-relations`` that rebuilds all relations.



It exports all valid reations from the relation-catalog, purges the relation-catalog (and the intid-catalog) and restores all valid relations.



Inspect relations

-----------------



There is a controlpanel ``http://localhost:8080/Plone/@@inspect-relations`` that allows you to inspect all relations in your site:



.. image:: https://raw.githubusercontent.com/collective/collective.relationhelpers/master/docs/relationinfo.png



Dealing with Archetypes-Relations

---------------------------------



This package does not support Archetypes but it can be of great help to migrate relations form Archetypes to Dexterity.

Here are two upgrade-steps.



The first stores all relations (AT and DX) as a annotation on the portal). Run that in Plone 4 or 5 if you still have AT content.::



    def store_relations(context=None):

        from plone.app.contenttypes.migration.utils import store_references

        portal = api.portal.get()

        store_references(portal)



The second restores them. Run it after you migrated all your content to Dexterity.::



    # Map References used with of Archetypes (Plone 4) to the ones used in Plone 5 with Dexterity

    RELATIONSHIP_FIELD_MAPPING = {

        'Working Copy Relation': 'iterate-working-copy',

        'relatesTo': 'relatedItems',

    }



    IGNORE = [

        'translationOf',  # LinguaPlone relation

    ]



    def restore_relations(context=None):

        portal = api.portal.get()

        all_stored_relations = IAnnotations(portal)['ALL_REFERENCES']

        log.info('Loaded {0} relations to restore'.format(

            len(all_stored_relations))

        )

        all_fixed_relations = []

        for rel in all_stored_relations:

            if rel['relationship'] in ignore:

                continue

            # plone.app.contenttypes exports references with 'relationship' but relationshelpers

            # expects 'from_attribute' which is what zc.relation uses.

            # Also some relationships have changed their name

            rel['from_attribute'] = RELATIONSHIP_FIELD_MAPPING.get(rel['relationship'], rel['relationship'])

            all_fixed_relations.append(rel)

        all_fixed_relations = sorted(all_fixed_relations, key=itemgetter('from_uuid', 'from_attribute'))

        relapi.restore_relations(all_relations=all_fixed_relations)



Installation

============



Install collective.relationhelpers by adding it to your buildout::



    [buildout]



    ...



    eggs =

        collective.relationhelpers



and then running ``bin/buildout``.



Contribute

==========



- Issue Tracker: https://github.com/collective/collective.relationhelpers/issues

- Source Code: https://github.com/collective/collective.relationhelpers



Support

=======



If you are having issues, please create a ticket.



License

=======



The project is licensed under the GPLv2.