xblock-utils: Various utilities for XBlocks ###########################################
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Purpose
These are a collection of utility functions, base test classes and documentation that are useful for any XBlocks.
⚠️ Deprecation Notice ⚠️
Effective Date: September 26, 2023
Repository Migration:
This xblock-utils repository has been deprecated <https://github.com/openedx/xblock-utils/issues/197>_ as of September 26, 2023, and the code and documentation have been migrated to the Xblock <https://github.com/openedx/XBlock>_ repository.
This decision was made to streamline and consolidate our codebase.
The migration process was completed through this Pull Request: PR #669 <https://github.com/openedx/XBlock/pull/669>_
Archival: We are going to archive the xblock-utils repository. This means that it will become read-only, and no further updates or changes will be accepted.
We appreciate your understanding and cooperation during this transition. If you have any questions or concerns, please don't hesitate to reach out to us through the XBlock repository's issue tracker.
Thank you for your continued support and contributions to the Open edX community.
Getting Started
.. code-block::
git clone git@github.com:openedx/xblock-utils.git cd xblock-utils
mkvirtualenv -p python3.8 xblock-utils
.. code-block::
workon xblock-utils
git checkout master git pull
make requirements
make test
git checkout -b <your_github_username>/<short_description>
vim ...
mkdir var touch var/workbench.log
pytest ./path/to/new/tests
make test
git commit ... git push
This component is automatically deployed to PyPI whenever new GitHub releases are made.
To deploy this library.
#. Update the version in xblockutils/__init__.py based on semantic versioning.
#. Create a new GitHub release with a tag matching the version.
#. Automation should build and deploy the version to PyPI
Getting Help
Start by going through the documentation_. If you need more help see below.
.. _the documentation: https://docs.openedx.org/projects/xblock-utils
If you're having trouble, we have discussion forums at https://discuss.openedx.org where you can connect with others in the community.
Our real-time conversations are on Slack. You can request a Slack invitation, then join our community Slack workspace.
For anything non-trivial, the best path is to open an issue in this repository with as many details about the issue you are facing as you can provide.
https://github.com/openedx/xblock-utils/issues
For more information about these options, see the Project Getting Help_ page.
.. _Slack invitation: https://openedx.org/slack .. _community Slack workspace: https://openedx.slack.com/ .. _Project Getting Help: https://openedx.org/getting-help
License
The code in this repository is licensed under the AGPLv3 unless otherwise noted.
Please see the LICENSE <LICENSE>_ for details.
Contributing
Contributions are very welcome.
Please read How To Contribute <https://openedx.org/r/how-to-contribute>_ for details.
This project is currently accepting all types of contributions, bug fixes, security fixes, maintenance work, or new features. However, please make sure to have a discussion about your new feature idea with the maintainers prior to beginning development to maximize the chances of your change being accepted. You can start a conversation by creating a new issue on this repo summarizing your idea.
The Open edX Code of Conduct
All community members are expected to follow the Open edX Code of Conduct_.
.. _Open edX Code of Conduct: https://openedx.org/code-of-conduct/
People
The assigned maintainers for this component and other project details may be
found in Backstage_. Backstage pulls this data from the catalog-info.yaml
file in this repo.
.. _Backstage: https://backstage.openedx.org/catalog/default/component/xblock-utils
Reporting Security Issues
Please do not report security issues in public. Please email security@openedx.org.
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More Documentation
.. code:: python
from xblockutils.studio_editable import StudioEditableXBlockMixin
This mixin will automatically generate a working studio_view form
that allows content authors to edit the fields of your XBlock. To use,
simply add the class to your base class list, and add a new class field
called editable_fields, set to a tuple of the names of the fields
you want your user to be able to edit.
.. code:: python
@XBlock.needs("i18n")
class ExampleBlock(StudioEditableXBlockMixin, XBlock):
...
mode = String(
display_name="Mode",
help="Determines the behaviour of this component. Standard is recommended.",
default='standard',
scope=Scope.content,
values=('standard', 'crazy')
)
editable_fields = ('mode', 'display_name')
That's all you need to do. The mixin will read the optional
display_name, help, default, and values settings from
the fields you mention and build the editor form as well as an AJAX save
handler.
If you want to validate the data, you can override
validate_field_data(self, validation, data) and/or
clean_studio_edits(self, data) - see the source code for details.
Supported field types:
field_name = Boolean(display_name="Field Name")field_name = Float(display_name="Field Name")field_name = Integer(display_name="Field Name")field_name = String(display_name="Field Name")field_name = String(multiline_editor=True, resettable_editor=False)field_name = String(multiline_editor='html', resettable_editor=False)Any of the above will use a dropdown menu if they have a pre-defined list of possible values.
List of unordered unique values (i.e. sets) drawn from a small set of
possible values:
field_name = List(list_style='set', list_values_provider=some_method)
List declaration must include the property list_style='set' to
indicate that the List field is being used with set semantics.List declaration must also define a list_values_provider method
which will be called with the block as its only parameter and which must
return a list of possible values.Rudimentary support for Dict, ordered List, and any other JSONField-derived field types
list_field = List(display_name="Ordered List", default=[])dict_field = Dict(display_name="Normal Dict", default={})Supported field options (all field types):
values can define a list of possible options, changing the UI element
to a select box. Values can be set to any of the formats defined in the XBlock source code <https://github.com/openedx/XBlock/blob/master/xblock/fields.py>__:
A finite set of elements: [1, 2, 3]
A finite set of elements where the display names differ from the values::
[
{"display_name": "Always", "value": "always"},
{"display_name": "Past Due", "value": "past_due"},
]
A range for floating point numbers with specific increments:
{"min": 0 , "max": 10, "step": .1}
A callable that returns one of the above. (Note: the callable does not get passed the XBlock instance or runtime, so it cannot be a normal member function)
values_provider can define a callable that accepts the XBlock
instance as an argument, and returns a list of possible values in one
of the formats listed above.
resettable_editor - defaults to True. Set False to hide the
"Reset" button used to return a field to its default value by removing
the field's value from the XBlock instance.
Basic screenshot: |Screenshot 1|
.. code:: python
from xblockutils.studio_editable import StudioContainerXBlockMixin
This mixin helps to create XBlocks that allow content authors to add,
remove, or reorder child blocks. By removing any existing
author_view and adding this mixin, you'll get editable,
re-orderable, and deletable child support in Studio. To enable authors to
add arbitrary blocks as children, simply override author_edit_view
and set can_add=True when calling render_children - see the
source code. To restrict authors so they can add only specific types of
child blocks or a limited number of children requires custom HTML.
An example is the mentoring XBlock: |Screenshot 2|
.. code:: python
from xblockutils.base_test import SeleniumXBlockTest
This is a base class that you can use for writing Selenium integration tests that are hosted in the XBlock SDK (Workbench).
Here is an example:
.. code:: python
class TestStudentView(SeleniumXBlockTest):
"""
Test the Student View of MyCoolXBlock
"""
def setUp(self):
super(TestStudentView, self).setUp()
self.set_scenario_xml('<mycoolblock display_name="Test Demo Block" field2="hello" />')
self.element = self.go_to_view("student_view")
def test_shows_field_2(self):
"""
The xblock should display the text value of field2.
"""
self.assertIn("hello", self.element.text)
.. code:: python
from xblockutils.studio_editable_test import StudioEditableBaseTest
This is a subclass of SeleniumXBlockTest that adds a few helper
methods useful for testing the studio_view of any XBlock using
StudioEditableXBlockMixin.
.. code:: python
from xblockutils.helpers import child_isinstance
If your XBlock needs to find children/descendants of a particular class/mixin, you should use
.. code:: python
child_isinstance(self, child_usage_id, SomeXBlockClassOrMixin)
rather than calling
.. code:: python
``isinstance(self.runtime.get_block(child_usage_id), SomeXBlockClassOrMixin)``.
On runtimes such as those in edx-platform, child_isinstance is
orders of magnitude faster.
.. |Screenshot 1| image:: https://cloud.githubusercontent.com/assets/945577/6341782/7d237966-bb83-11e4-9344-faa647056999.png .. |Screenshot 2| image:: https://cloud.githubusercontent.com/assets/945577/6341803/d0195ec4-bb83-11e4-82f6-8052c9f70690.png
This mixin provides access to instance-wide XBlock-specific configuration settings. See wiki page for details
This mixin provides XBlock theming capabilities built on top of XBlock-specific settings. See wiki page for details
FAQs
Various utilities for XBlocks
We found that xblock-utils demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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