[英]array of hashes as hash key and value as array using jbuilder
我正在嘗試使用Jbuilder生成JSON響應
我有很多這樣的哈希
words= [
{"term": "abc",
"definition": "123"
} ,
{"term": "abc",
"definition": "345"
} ,
{"term": "xyz",
"definition": "890"
}
]
我想將此轉換為JSON。 這里的邏輯是將所有術語作為鍵並將其定義推入數組
{
"abc": ["123","345"],
“xyz”: ["890"]
}
到目前為止,我取得的成就是
words.each do |word|
json.set! word['text'] ,word['definition']
end
給我
{
"abc": "123"
"abc": "345",
"xyz": "890"
}
可以幫助我。
您正在尋找這樣的東西,
words = [{:term=>"abc", :definition=>"123"}, {:term=>"abc", :definition=>"345"}, {:term=>"xyz", :definition=>"890"}]
words.inject({}) do |h, w|
h[w[:term]] ||= []
h[w[:term]] << w[:definition]
h
end
#=> {"abc"=>["123", "345"], "xyz"=>["890"]}
words.group_by{|d| d[:term]}.map{|k,v| {k => v.map{|val| val[:definition]}}}.reduce(&:merge)
words.map(&:values).group_by(&:shift).each do |k, values|
json.set! k, values.flatten
end
如果不能保證:term
和:definition
的順序,則需要在原始哈希上對.map(&:sort)
進行中間調用,並且:shift
應該讀為:pop
因為在排序后:definition
s會出現:term
。
最簡單的解決方案:)
words= [
{"term": "abc",
"definition": "123"
} ,
{"term": "abc",
"definition": "345"
} ,
{"term": "xyz",
"definition": "890"
}
]
result_hash = Hash.new{|hsh, key| hsh[key]=[] }
words.map{|x| result_hash[x[:term]].push(x[:definition])}
您的輸出將在result_hash中
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