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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.