正在从这个 JSON API 获取一些产品，我想知道——我真的需要吗Hashie::Mash?
直播应用程序：http://runnable.com/U-QJCIFvY2RGWL9B/pretty-json-keys http://runnable.com/U-QJCIFvY2RGWL9B/pretty-json-keys
main_controller.rb:
response = prettify(JSON.parse(@json_text))
mashie = Hashie::Mash.new(response)
@products = []
mashie.products.each do |product|
product.extend Hashie::Extensions::DeepFetch
product.price = product.deep_fetch :sale_price
@products << product
end
@products
我试过这个：
response = prettify(JSON.parse(@json_text)['products'])
@products = []
response.each do |product|
product.extend Hashie::Extensions::DeepFetch
product.price = product.deep_fetch :sale_price
@products << product
end
@products
但这会返回：
Hashie::Extensions::DeepFetch::UndefinedPathError in MainController#index
Could not fetch path (sale_price) at sale_price
您可能想做这样的事情：
mashie.products.each do |product|
product.extend Hashie::Extensions::DeepFetch
product.price = product.deep_fetch(:sale_price) { 'Not Found' }
# Returns 'Not Found' if it does not find the key sale_price. It can be anything, like nil, 0, 'Not Found'
@products << product
end
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