blocks|key|1404046|text|如果你用散列语法将参数传递给Ruby函数，Ruby会认为这就是你的目标。因此：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404047|def+login_success(hsh+=+{})
++puts+hsh[:msg]
end|code-block|syntax|javascript|1404048|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you pass paramaters to a Ruby function in hash syntax, Ruby will assume that is your goal. Thus:

<pre><code>def login_success(hsh = {})
 puts hsh[:msg]
end
</code></pre>

blocks|key|1404135|text|要记住的关键一点是，如果散列参数是函数的最后一个参数，则只能使用省略散列字符{}的语法。所以你可以做Allyn做过的事情，这会起作用的。也是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404136|def+login_success(name,+hsh)
++puts+"User+#{name}+logged+in+with+#{hsh[:some_hash_key]}"
end|code-block|syntax|javascript|1404137|你可以用下面的命令调用它|1404138|login_success+"username",+:time+=>+Time.now,+:some_hash_key+=>+"some+text"|1404139|但是，如果散列不是最后一个参数，则必须用{}将散列元素括起来。|1404140|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

A key thing to remember is that you can only do the syntax where you leave out the hash characters {}, if the hash parameter is the last parameter of a function. So you can do what Allyn did, and that will work. Also

<pre><code>def login_success(name, hsh)
 puts "User #{name} logged in with #{hsh[:some_hash_key]}"
end
</code></pre>

And you can call it with

<pre><code>login_success "username", :time =&gt; Time.now, :some_hash_key =&gt; "some text"
</code></pre>

But if the hash is not the last parameter you have to surround the hash elements with {}.

blocks|key|1404223|text|使用一个参数。Ruby会将命名后的值转换为哈希值：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404224|def+login_success+arg
+#+Your+code+here
end

login_success+:msg+=>+'Success!',+:gotourl+=>+user_url
#+=>+login_success({:msg+=>+'Success!',+:gotourl+=>+user_url})|code-block|syntax|javascript|1404225|如果你真的想要确保你得到一个散列，而不是默认的ruby+duck类型，那么你需要控制它。例如，如下所示：|1404226|def+login_success+arg
++raise+Exception.new('Argument+not+a+Hash...')+unless+arg.is_a?+Hash
++#+Your+code+here
end|1404227|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Use one single argument. Ruby will transform the named values into a hash:

<pre><code>def login_success arg
 # Your code here
end

login_success :msg =&gt; 'Success!', :gotourl =&gt; user_url
# =&gt; login_success({:msg =&gt; 'Success!', :gotourl =&gt; user_url})
</code></pre>

If you really want to make sure you get a hash, instead of the default ruby duck typing, then you would need to control for it. Something like, for example:

<pre><code>def login_success arg
 raise Exception.new('Argument not a Hash...') unless arg.is_a? Hash
 # Your code here
end
</code></pre>

blocks|key|1404284|text|随着Ruby+2.0中关键字参数的出现，您现在可以这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1404285|def+login_success(msg:"Default",+gotourl:"http://example.com")
++puts+msg
++redirect_to+gotourl
end|code-block|syntax|javascript|1404286|在Ruby+2.1中，您可以省略默认值，|1404287|def+login_success(msg:,+gotourl:)
++puts+msg
++redirect_to+gotourl
end|1404288|调用时，省略没有默认值的参数将引发ArgumentError|style|CODE|1404289|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.marc-andre.ca/2013/02/23/ruby-2-by-example/^0|2|8|0|0|0|0|0|H|D|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|15|8|@$A|16|B|17|O|P]]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

With the advent of Keyword Arguments in <a href="http://blog.marc-andre.ca/2013/02/23/ruby-2-by-example/" rel="noreferrer">Ruby 2.0</a> you can now do

<pre><code>def login_success(msg:"Default", gotourl:"http://example.com")
 puts msg
 redirect_to gotourl
end
</code></pre>

In Ruby 2.1 you can leave out the default values,

<pre><code>def login_success(msg:, gotourl:)
 puts msg
 redirect_to gotourl
end
</code></pre>

When called, leaving out a parameter that has no default value will raise an <code>ArgumentError</code>

I know this may be a stupid question, but I don't know how to create a ruby method that accepts a hash of parameters. I mean, in Rails I'd like to use a method like this:

<pre><code>login_success :msg =&gt; "Success!", :gotourl =&gt; user_url
</code></pre>

What is the prototype of a method that accepts this kind of parameters? How do I read them?

Create a ruby method that accepts a hash of parameters

我知道这可能是一个愚蠢的问题，但我不知道如何创建一个接受参数散列的ruby方法。我的意思是，在Rails中，我想使用这样的方法：login_success :msg => "Success!", :gotourl => user_url接受这种参数的方法的原型是什么？我该如何阅读它们？

问创建一个接受参数散列的ruby方法
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问创建一个接受参数散列的ruby方法EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问创建一个接受参数散列的ruby方法
EN