Price range filtering of products

[pjedrzejewski]

Just like on https://bestvalue.eu/listing/skincare?badge=BestSeller

[gabiudrescu]

I can provide you the feature files we are currently using for our listings.

As you know, this is based on ElasticSearch

[pjedrzejewski]

@gabiudrescu That would be great!

[Arminek]

@gabiudrescu really cool as soon as this #6 will be merged you can open pr with the feature 🎉

[gabiudrescu]

after I looked in our codebase, I have realized that this feature is so early that we don't have features in a form we can share them.

but, I can share with you our user story:

---

In order to easily select what I want to buy according to my budget,
As a customer,
I need price filters.

Criteria of acceptance:

• pricing filters should be exclusive (only one price range filter can be applied at a given moment)
• there should be an option to manually insert min & max for price range
• the number of price ranges for this filter will be a configurable option application-wide; the entire catalogue will have the same number of price ranges (e.g. 4)
• the number of products will be distributed to each filter evenly; see more details in the note section
• pricing ranges will be rounded to exact number; e.g: 100 - 199.99
• pricing ranges will be calculated only related to taxon; the pricing ranges will not be modified by other applied filters; e.g:
  -- we have taxon "Perfume"
  -- the algorithm calculates 5 relevant pricing intervals
  -- no matter how many other filters are applied, the same 5 relevant pricing intervals can be used
  -- the ones not having products will not be displayed
• pricing rules should be always applied to EUR price - no matter what's the locale

Notes:

We will tried to replicate the algorithm from a search engine service provider:

Dynamic (currently used) , the only configurable parameter is number of steps (default = 5)
This tries to create 5 groups each containing some results.
It starts trying equal step sizes , i.e highest/5 ,
0-200, 200-400,400-600,800-100
if this does not provide a good distribution
The algorithm then tries to adjust the step sizes to provide an acceptable distribution.

The priority for price range and rounding up / down the interval head is for having an even product distribution; e.g. if we have the interval between 250 and 500 and the majority is between 200 and 250 + 250 and 300, the intervals will be calculated to have an even distribution.