Question

如何使用Hash#select和/或Array#select仅解析包含products的{{1}}数组？

直播应用：http://runnable.com/U-eWKpORZ5A644gK/array-hash-select-for-ruby-on-rails（请参阅{ "name": "sale", "value": "true" }）

main_controller.rb

Answer 1

使用select

myarr = [{ "name" => "sale", "value" => "true" }, { "name" => "test", "value" => "true"}]
myarr.select { |h| h["name"] == "sale" && h["value"] == "true" }
=> [{"name"=>"sale", "value"=>"true"}]

在你的情况下，你会得到一个Hash（在解析JSON之后），如下所示：

response = {"productHeader" => {"totalHits" => 32090}, "products" => [{ "name" => "sale", "value" => "true" }, { "name" => "test", "value" => "true"}]}

然后，您可以使用此代码：

response = JSON.parse(@json_text)

response["products"].select { |h| h["name"] == "sale" && h["value"] == "true" }.each do |filtered_response|
  # Do whatever you want with the filtered product
end

Answer 2

即使使用mashie，这也可以。

@products = response['products'].select do |e|
  e.is_a? Hash \
  and (f = e['fields']).is_a? Array \
  and f.any? do |g|
    g.is_a? Hash \
    and g['name'] == 'sale' \
    and g['value'] == 'true'
  end
end

或尝试

@products = response['products'].select do |e|
  e.is_a? Hash \
  and (f = e['fields']).is_a? Array \
  and f.any? do |g|
    g.is_a? Hash \
    and g['name'] == 'sale' \
    and g['value'] == 'true'
  end
end.map{ |e| Hashie::Mash.new(e) }

仅使用Hash #select和/或Array＃select解析具有特定哈希值的数组

2 个答案: