[英]How to write to a JSON file in the correct format
I am creating a hash in Ruby and want to write it to a JSON file, in the correct format. 我正在Ruby中创建哈希,并希望以正确的格式将其写入JSON文件。
Here is my code: 这是我的代码:
tempHash = {
"key_a" => "val_a",
"key_b" => "val_b"
}
fJson = File.open("public/temp.json","w")
fJson.write(tempHash)
fJson.close
And here is the contents of the resulting file: 这是结果文件的内容:
key_aval_akey_bval_b
I'm using Sinatra (don't know what version) and Ruby v 1.8.7. 我正在使用Sinatra(不知道哪个版本)和Ruby v 1.8.7。
How can I write this to the file in the correct JSON format? 如何以正确的JSON格式将其写入文件?
With formatting 带有格式
require 'json'
tempHash = {
"key_a" => "val_a",
"key_b" => "val_b"
}
File.open("public/temp.json","w") do |f|
f.write(JSON.pretty_generate(tempHash))
end
Output 输出量
{
"key_a":"val_a",
"key_b":"val_b"
}
This question is for ruby 1.8 but it still comes on top when googling. 这个问题是针对ruby 1.8的,但是在谷歌搜索时它仍然是最重要的。
in ruby >= 1.9 you can use 在红宝石> = 1.9中可以使用
File.write("public/temp.json",tempHash.to_json)
other than what mentioned in other answers, in ruby 1.8 you can also use one liner form 除了在其他答案中提到的以外,在ruby 1.8中,您还可以使用一种衬里形式
File.open("public/temp.json","w"){ |f| f.write tempHash.to_json }
To make this work on Ubuntu Linux: 要在Ubuntu Linux上执行此操作:
I installed the Ubuntu package ruby-json: 我安装了Ubuntu软件包ruby-json:
apt-get install ruby-json
I wrote the script in ${HOME}/rubybin/jsonDEMO
我在${HOME}/rubybin/jsonDEMO
编写了脚本
$HOME/.bashrc
included: $HOME/.bashrc
包括:
${HOME}/rubybin:${PATH}
(On this occasion I also typed the above on the bash command line.) (在这种情况下,我还在bash命令行上输入了以上内容。)
Then it worked when I entered on the command line: 然后,当我在命令行上输入时它就起作用了:
jsonDemo
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