Re-enable variant#inventory_quantity for serialization

[axlekb]

First time venturing into inventory... based on the docs it appears variant.inventory_quantity has re-emerged with a different meaning/use after being deprecated and renamed to old_inventory_quantity. Therefore, I believe it should again be "serialized" with current API versions?

https://github.com/Shopify/shopify_api/blob/v9.2.0/test/variant_test.rb

 def test_deprecated_inventory_fields_are_included_in_2019_07
    ShopifyAPI::Base.api_version = '2019-07'
    assert @variant.as_json.include?('inventory_quantity')
  end

  def test_deprecated_inventory_fields_are_removed_in_2020_01
    ShopifyAPI::Base.api_version = '2020-01'
    refute @variant.as_json.include?('inventory_quantity')
  end

https://github.com/Shopify/shopify_api/blob/v9.2.0/lib/shopify_api/resources/variant.rb

def serializable_hash(options = {})
      if allow_inventory_params?
        super(options)
      else
        super(options).tap do |resource|
          (resource['variant'] || resource).except!('inventory_quantity', 'old_inventory_quantity')
        end
      end
    end

  def allow_inventory_params?
      Base.api_version < ApiVersion.find_version('2019-10')
    end

[paulomarg]

Hey @axlekb, thank you for reporting this, we'll look into it!

[github-actions]

This issue is stale because it has been open for 90 days with no activity. It will be closed if no further action occurs in 14 days.

[github-actions]

We are closing this issue because it has been inactive for a few months.
This probably means that it is not reproducible or it has been fixed in a newer version.
If it’s an enhancement and hasn’t been taken on since it was submitted, then it seems other issues have taken priority.

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