[Tidy] Prepare for dynamic filters, part 2 of 2

[antonymilne]

Description

The thrilling sequel to #850 and probably the final part before @petar-qb does the actual implementation of this 🙌

Again I nominate @petar-qb as lead reviewer and @maxschulz-COL and second pair of eyes 🙏

Most changes here are to _action_utils.py, which was ready for a good refactoring.

• data loading during runtime is much more efficient now. Before if you had 10 graphs on a page all using the same data then we'd load the data 10 times. Now we only load it once. Still need to write some tests for this to make sure it's working as intended, but that's the idea anyway. This is done by _multi_load in data_manager. For some cases this could actually make a big difference to performance when caching is off (as is the default)
• Filter.pre_build now also uses this _multi_load functionality
• untangled a few helper functions in action_utils.py. There is a clearer separation of responsibilities between different functions now.
• the newly introduced TODO NEXT are short-term ones and will go once we've finished implementing dynamic filters

@petar-qb I recommend reviewing as follows:

• look at commits in order: 13f022e f2bd362 1dbacb0 4d0fb0e (sorry I had very clear commit history until the base branch got merged into main and then I screwed it up 🤦)
• read through the whole actions_utils.py and filter.py file as it now stands

• do some manual testing

  TODO:

• [x] Write tests

Screenshot

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[github-actions[bot]]

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Updated on: 2024-11-11 12:27:23 UTC Commit: 25d33e458a64272d907066e47acaf893cf82cfc3

Link: vizro-core/examples/dev/

Link: vizro-core/examples/scratch_dev

Link: vizro-core/examples/visual-vocabulary/

Link: vizro-ai/examples/dashboard_ui/