René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Make register_templates plugin-friendly","articleBody":"Context: When creating a FeinCMS site using some kind of plugin mechanism, I ran into this problem.\r\n\r\nEach plugin wants to contribute some Template to the main project. To do that, it will do something like\r\n\r\n```python\r\nfrom feincms.module.page.models import Page\r\n\r\nregions_main = (('main', 'Content'), )\r\nPage.register_templates(\r\n    {'key': 'mmmmh', 'title': 'Tasty template', 'path': 'munch/nomnom.html', 'regions': regions_main}\r\n)\r\n```\r\n\r\nThis will not work.\r\n\r\nEach region holds a list of content types that can be used in that region. Unfortunately, this list is built when a concrete content type is created, so calling `register_templates` again later will add regions that have no content types at all. \r\n\r\nI can paper over this by patching in all content types here\r\n\r\n```python\r\nfor region in Page._feincms_all_regions:\r\n    if not region._content_types:\r\n        region._content_types = Page._feincms_content_types.copy()  # copy is important otherwise CTs will be duplicated\r\n```\r\n\r\nbut that is not always what is wanted, since I can't restrict CTs to a region that way. \r\n\r\nIf we ever want to restrict a CT to a certain region, things will become more complicated (the region set for each CT is not stored anywhere, so that information is lost once the CT has been instanciated).\r\n\r\nFood for thought...\r\n","author":{"url":"https://github.com/mjl","@type":"Person","name":"mjl"},"datePublished":"2022-04-20T10:19:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/703/feincms/issues/703"}