rename uuid to id_v2

Author: mslabko

design-documents/graph-ql/coverage/add-items-to-cart-single-mutation.md

@@ -32,6 +32,7 @@ Each product may have options. Option can be of 2 types (see example below):
 ```
 
 We can consider "Selected Option" and "ID for Entered Option" as UUID. They meet the criteria:
+
 - "Selected Option" represents option value, while "ID for Entered Option" represents option
 - Must be unique across different options
 - Returned from server
@@ -50,13 +51,14 @@ Entered options:
 
 #### Option implementation
 
-Product schema should be extended in order to provide option UUID.
+Product schema should be extended in order to provide option identifier (aka first iteration of "UUID").
+Until introducing UUID lets name this identifier as *"id_v2"
 
-Option UUID is `base64` encoded string, that encodes details for each option and in most cases can be presented as 
+Option *id_v2* is `base64` encoded string, that encodes details for each option and in most cases can be presented as 
 `base64("<option-type>/<option-id>/<option-value-id>")`
-For example, for customizable drop-down option "Color(id = 1), with values Red(id = 1), Green(id = 2)" UUID for Color:Red will looks like `"Y3VzdG9tLW9wdGlvbi8xLzE=" => base64("custom-option/1/1")` 
+For example, for customizable drop-down option "Color(id = 1), with values Red(id = 1), Green(id = 2)" id_v2 for Color:Red will looks like `"Y3VzdG9tLW9wdGlvbi8xLzE=" => base64("custom-option/1/1")` 
 
-Here is a GQL query that shows how to add a new field "uuid: String!" to cover existing cases:
+Here is a GQL query that shows how to add a new field "id_v2: String!" to cover existing cases:
 
 
 ``` graphql
@@ -71,15 +73,15 @@ query {
           ... on CustomizableRadioOption {
             title
             value {
-              uuid # introduce new UUID field in CustomizableRadioValue
+              id_v2 # introduce new id_v2 field in CustomizableRadioValue
               option_type_id
               title
             }
           }
           ... on CustomizableDropDownOption {
             title
             value {
-              uuid # introduce new UUID field in CustomizableDropDownValue
+              id_v2 # introduce new id_v2 field in CustomizableDropDownValue
               # see \Magento\QuoteGraphQl\Model\Cart\BuyRequest\CustomizableOptionsDataProvider
               option_type_id
               title
@@ -90,15 +92,15 @@ query {
       }      ... on ConfigurableProduct {
         variants {
           attributes {
-            uuid # introduce new UUID field in ConfigurableAttributeOption  (format: configurable/<attribute-id>/<value_index>)
+            id_v2 # introduce new id_v2 field in ConfigurableAttributeOption  (format: configurable/<attribute-id>/<value_index>)
             # see \Magento\ConfigurableProductGraphQl\Model\Cart\BuyRequest\SuperAttributeDataProvider
             code
             value_index
           }
         }
       }      ... on DownloadableProduct {
         downloadable_product_links {
-          uuid #  introduce new UUID field in DownloadableProductLinks (format: downloadable/link/<link_id>)
+          id_v2 #  introduce new id_v2 field in DownloadableProductLinks (format: downloadable/link/<link_id>)
           #  see \Magento\DownloadableGraphQl\Model\Cart\BuyRequest\DownloadableLinksDataProvider
           title
         }
@@ -107,15 +109,15 @@ query {
           sku
           title
           options {
-            uuid #  introduce new UUID field in BundleItemOption (format: bundle/<option-id>/<option-value-id>/<option-quantity>)
+            id_v2 #  introduce new id_v2 field in BundleItemOption (format: bundle/<option-id>/<option-value-id>/<option-quantity>)
             # see \Magento\BundleGraphQl\Model\Cart\BuyRequest\BundleDataProvider
             id
             label
           }
         }
       }      ... on GiftCardProduct {
         giftcard_amounts {
-          uuid # introduce new UUID field in GiftCardAmounts (format: giftcard/...TBD)
+          id_v2 # introduce new id_v2 field in GiftCardAmounts (format: giftcard/...TBD)
           # see \Magento\GiftCard\Model\Quote\Item\CartItemProcessor::convertToBuyRequest
           value_id
           website_id