shopify_example.rb

# Saving a product from database
product = ShopifyAPI::Product.find(179761209) # This does an get http request to shopify api
db_product = DBProduct.new # You have to create a new rails model
db_product.shopify_id = product.id
db_product.save

# Saving a product to shopify
product.title = 'changed'
product.save # updates product in shopify, http put request

#Fetching the saved product in the database from shopify
product_from_db = DBProduct.all.first
shopify_product = ShopifyAPI::Product.find(product_from_db.shopidy_id) # This does an get http request to shopify api with the id you saved in the database

# Creating a product in shopify
product = ShopifyAPI::Product.create({attrs..}) # just give it a hash with the required attributes

#Another way
product = ShopifyAPI::Product.new
product.title = 'shoes'
product.description = 'this is a shoe'
product.save # here it does an http request not a database one, if you want to save into database create a new model to save this information