FEATURE OrderFactory - record purchases for products, orders

[jsirish]

move the load of calculating inventory for products and variations from the add to cart form to order processing.

As each order is processed, it will query all OrderDetail records and record the number of purchases for product records. It will also query all OrderVariation records and record the number of purchases for Variations

[jsirish]

related to dynamic/silverstripe-foxy-inventory#29

[codecov]

Codecov Report

Merging #57 into master will decrease coverage by 1.11%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master      #57      +/-   ##
============================================
- Coverage     18.62%   17.51%   -1.12%     
- Complexity       71       80       +9     
============================================
  Files            11       11              
  Lines           204      217      +13     
============================================
  Hits             38       38              
- Misses          166      179      +13     

Flag	Coverage Δ	Complexity Δ
#php	17.51% <0.00%> (-1.12%)	80.00 <0.00> (+9.00)	⬇️

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Impacted Files	Coverage Δ	Complexity Δ
src/Factory/OrderFactory.php	0.00% <0.00%> (ø)	19.00 <0.00> (+9.00)

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[muskie9]

I think this is a good option for tracking number purchased, however seeing if we can adjust a few things to get it to a single query and return a live number will provide a couple things:

• Less iteration of all orders
• Less write() calls (this is in place currently to reduce the number of SELECT queries)

One thing that was noted in #53 is the actual product_total field from the Foxy data feed did not have an accurate count. This may have been patched recently on the Foxy end so we need to revisit that as well. I'll work on generating some test cases to see if we can get a helper method in this module to get the number purchased based on a Product or Variation code.

If we can't get that to work as expected with minimal queries we'll re-focus on this methodology and work out how to reduce the number of iterations required.