Wagtail v4 new page issue persists

[ethanaward]

Expected behaviour

I am able to add the streamforms WagtailFormBlock to a StreamField on my page and then insert an existing form.

Actual behaviour

Attempting to access the page results in the following error, identical to the one described in #200:

Traceback (most recent call last):
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/contrib/staticfiles/handlers.py", line 76, in __call__
    return self.application(environ, start_response)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/core/handlers/wsgi.py", line 133, in __call__
    response = self.get_response(request)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/core/handlers/base.py", line 130, in get_response
    response = self._middleware_chain(request)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/core/handlers/exception.py", line 49, in inner
    response = response_for_exception(request, exc)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/core/handlers/exception.py", line 114, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/core/handlers/exception.py", line 149, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django_extensions/management/technical_response.py", line 40, in null_technical_500_response
    raise exc_value.with_traceback(tb)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/core/handlers/base.py", line 204, in _get_response
    response = response.render()
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/auth.py", line 197, in overridden_render
    return render()
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/response.py", line 105, in render
    self.content = self.rendered_content
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/response.py", line 83, in rendered_content
    return template.render(context, self._request)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 988, in render
    output = self.filter_expression.resolve(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 671, in resolve
    obj = self.var.resolve(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 796, in resolve
    value = self._resolve_lookup(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 858, in _resolve_lookup
    current = current()
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/panels.py", line 392, in render_form_content
    return mark_safe(self.render_html() + self.render_missing_fields())
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/ui/components.py", line 20, in render_html
    return template.render(context_data)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/defaulttags.py", line 214, in render
    nodelist.append(node.render_annotated(context))
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 988, in render
    output = self.filter_expression.resolve(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 671, in resolve
    obj = self.var.resolve(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 796, in resolve
    value = self._resolve_lookup(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 858, in _resolve_lookup
    current = current()
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/ui/components.py", line 20, in render_html
    return template.render(context_data)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/defaulttags.py", line 214, in render
    nodelist.append(node.render_annotated(context))
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/templatetags/wagtailadmin_tags.py", line 948, in render
    children = self.nodelist.render(context) if self.nodelist else ""
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/template/library.py", line 192, in render
    output = self.func(*resolved_args, **resolved_kwargs)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/templatetags/wagtailadmin_tags.py", line 876, in component
    return obj.render_html(context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/ui/components.py", line 15, in render_html
    context_data = self.get_context_data(parent_context)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/admin/panels.py", line 814, in get_context_data
    rendered_field = self.bound_field.as_widget(attrs=widget_attrs)
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/django/forms/boundfield.py", line 93, in as_widget
    return widget.render(
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/blocks/base.py", line 552, in render
    return self.render_with_errors(
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/blocks/base.py", line 546, in render_with_errors
    block_json=self.block_json,
  File "/Users/eward/.virtualenvs/foley/lib/python3.10/site-packages/wagtail/blocks/base.py", line 523, in block_json
    return self._block_json
AttributeError: 'BlockWidget' object has no attribute '_block_json'

Steps to reproduce the behaviour

Create a new project with the WagtailFormBlock as an option in a StreamField for a page. Attempt to access one of those pages, and you get the above error.

[TonisPiip]

+1 very annoying. I'm glad the devs have done a release to allow for a hotfix while using v4, but they should really apply the hotfix themselves and make another release...

[TonisPiip]

There are some hack solutions which do work, it does allow for v4. But it's not pretty, better than having to fork the project though.
#200 (comment)

[VdeJong]

With the new release, 3.22, just should be fixed. Let me know if that version works for you @ethanaward

[ethanaward]

Yep, looks like the latest update fixed it for me! I'll close this issue.