将嵌套数组转换为JSON [英] Convert nested array to JSON
本文介绍了将嵌套数组转换为JSON的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
此代码:
@countries.map { |l| [l.country_name, l.latitude, l.longitude, l.capital] }
返回
[["country_name_1", latitude, longitude, capital],["country_name_2", latitude, longitude, capital],...]
但是我需要转换为JSON;像这样的东西:
But I need to convert to JSON; something like this:
{
"country_name_1" : [latitude, longitude, "capital"],
"country_name_2" : [latitude, longitude, "capital"],
.
.
.
}
推荐答案
这应该有效:
Hash[@countries.map { |l| [l.country_name, [l.latitude, l.longitude, l.capital]] }]
Rails还提供 index_by
:>
Rails also provides index_by
:
@countries.index_by(&:country_name)
# => {
# "country_name_1" => #<Country latitude:..., longitude:...>,
# "country_name_2" => #<Country latitude:..., longitude:...>,
# }
对象可能比哈希更方便.
Objects might be more convenient than hashes.
Rails内置了对JSON的支持: http://guides.rubyonrails. org/layouts_and_rendering.html#rendering-json
Rails has built-in support for JSON: http://guides.rubyonrails.org/layouts_and_rendering.html#rendering-json
您还可以手动调用 to_json
:
You can also call to_json
manually:
hash = Hash[@countries.map { |l| [l.country_name, [l.latitude, l.longitude, l.capital]] }]
hash.to_json
或使用 JSON Builder gem.
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