Question

我正在使用Ruby on Rails 3.0.7，我想知道如何初始化\ build“自定义”数据结构响应where方法，就像它工作一样，例如，对于常见的RoR AssociationCollection对象

例如：

# The following code should work after build the 'test_data' as well... 
# but how to build that?

test_data.where(:test_attribute => 'test_value')

Answer 1

我对你所追求的内容并不完全清楚，但你可以创建一个包装器（例如）使用where进行搜索的哈希数组。

class Search
  def initialize(data)
    @data = data
  end

  def where(filters={})
    @data.select do |item|
      filters.all?{|key, value| item[key] == value }
    end
  end
end



data = [
  { :name => 'Sam', :age => 27, :gender => 'M' },
  { :name => 'Sue', :age => 27, :gender => 'F' },
  { :name => 'Bob', :age => 32, :gender => 'M' }
]

search = Search.new(data)
search.where(:age => 27)      # returns array containing Sam and Sue hashes
search.where(:gender => 'M')  # returns array containing Sam and Bob hashes
search.where(:age => 27, :gender => 'M')  # returns array containing just Sam

Initialize \构建一个响应`where`方法的“自定义”数据结构

1 个答案: