[英]How to change hash key from array of hashes in ruby?
鉴于:
data = [
{"votable_id"=>1150, "user_ids"=>"1,2,3,4,5,6,"},
{"votable_id"=>1151, "user_ids"=>"55,66,34,23,56,7,8"}
]
这是预期的结果。 数组应该有前 5 个元素。
data = [
{"votable_id"=>1150, "user_ids"=>["1","2","3","4","5"]},
{"votable_id"=>1151, "user_ids"=>["55","66","34","23","56","7",8"]}
]
这是我尝试过的:
data.map{|x| x['user_ids'] = x['user_ids'].split(',').first(5)}
还有其他优化的解决方案吗?
您也可以像这样使用.map
和.tap
data.map do |h|
h.tap { |m_h| m_h["user_ids"]= m_h["user_ids"].split(',').first(5)}
end
data = [
{"votable_id"=>1150, "user_ids"=>"1,2,3,4,5,6,"},
{"votable_id"=>1151, "user_ids"=>"55,66,34,23,56,7,8"}
]
代码
h=data.map do |h|
h["user_ids"]=[h["user_ids"].split(',').first(5)].flatten
h
end
p h
Output
[{"votable_id"=>1150, "user_ids"=>["1", "2", "3", "4", "5"]}, {"votable_id"=>1151, "user_ids"=>["55", "66", "34", "23", "56"]}]
data.map { |h| h.merge("user_ids"=>h["user_ids"].split(',').first(5)) }
#=> [{"votable_id"=>1150, "user_ids"=>["1", "2", "3", "4", "5"]},
# {"votable_id"=>1151, "user_ids"=>["55", "66", "34", "23", "56"]}]
请参阅Hash#merge 。 这使data
保持不变。 要修改(或变异) data
,请使用Hash#merge! (又名update
)。 h.merge(k=>v)
是h.merge({ k=>v })
的快捷方式。
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