docbrown/spec/fixtures/feed-variants/broken/broken-fallback.json
Jeremy Friesen 0d0464be2f
Allowing VariantQuery for Feed Generation (#17382)
* Allowing VariantQuery for Feed Generation

Apologies for the breadth of this pull request, I had considered many
small commits, but felt that would've been more effort for the value
provided.

This commit includes the following:

- Documentation updates to the feed variant (though not the final pass)
- Renaming and adding RelevancyLevers that help differentiate
- Adding RelevancyLever#range to provide documentation
- Reducing redundent controller logic by making a
  `Articles::Feeds.feed_for` method.
- Adding some configuration validation for RelevancyLevers
- Adding constants for better clarification
- Testing unhappy paths for feed configuration
- Adjusting the module namespace of some objects
- Exposing top-level configurations for variants (along with their
  defaults)
- Creating the VariantyQuery that at present inherits from the
  `Articles::Feeds::WeightedQueryStrategy`

As implemented, we can deploy this code to production without using the
new VariantQuery.  Once we toggle on the
`:feed_uses_variant_query_feature` FeatureFlag, it will switch to using
the VariantQuery.  The VariantQuery's two variants and the
internal configuration of `Articles::Feeds::WeightedQueryStrategy`
produce the same query.

The goal of this factor is to allow for a quick on and off toggle of the
feed query; to ensure that what we introduce remains performant.

- Closes forem/forem#17272
- Closes forem/forem#17276
- Closes forem/forem#17216

In addition, I will be recording a code-walkthrough and linking that
recording to the pull request.

* Apply suggestions from code review

Co-authored-by: Mac Siri <krairit.siri@gmail.com>

Co-authored-by: Mac Siri <krairit.siri@gmail.com>
2022-04-21 11:07:09 -04:00

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{
"max_days_since_published": 15,
"order_by": "relevancy_score_and_publication_date",
"levers": {
"daily_decay": {
"cases": [
[0, 1],
[1, 0.99],
[2, 0.985],
[3, 0.98],
[4, 0.975],
[5, 0.97],
[6, 0.965],
[7, 0.96],
[8, 0.955],
[9, 0.95],
[10, 0.945],
[11, 0.94],
[12, 0.935],
[13, 0.93],
[14, 0.925]
],
"fallback": "OR SELECT * FROM SOMETHING"
}
}
}