Add _prefix classmethod to Article resource handling blog_id presence or absence same as the Variant resource does for product_id
Add _prefix classmethod to Article resource handling blog_id presence or absence same as the Variant resource does for product_id

asiviero/shopify_python_api,varesa/shopify_python_api,metric-collective/shopify_python_api,ifnull/shopify_python_api,SmileyJames/shopify_python_api,Shopify/shopify_python_api,gavinballard/shopify_python_api