blocks|key|1295927|text|在您的控制器中，您应该能够访问名为params的字典(散列)。因此，如果您知道每个查询参数的名称，那么只需执行params[:param1]即可访问它……如果您不知道参数的名称，您可以遍历字典并获取键。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1295928|一些简单的例子here。|1295929|entityMap|0|LINK|mutability|MUTABLE|url|http://rails.learnhub.com/lesson/6371-action-controller-parameters^0|H|6|1J|F|0|7|4|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

In your Controller, you should be able to access a dictionary (hash) called <code>params</code>. So, if you know what the names of each query parameter is, then just do <code>params[:param1]</code> to access it... If you don't know what the names of the parameters are, you could traverse the dictionary and get the keys.

Some simple examples <a href="http://rails.learnhub.com/lesson/6371-action-controller-parameters" rel="nofollow noreferrer">here</a>.

blocks|key|1081048|text|我认为您想要将任何给定的URL字符串转换为散列？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081049|你可以试试http://www.ruby-doc.org/stdlib/libdoc/cgi/rdoc/classes/CGI.html#M000075|offset|length|1081050|require+'cgi'

CGI::parse('param1=value1&param2=value2&param3=value3')|code-block|syntax|javascript|1081051|返回|1081052|{"param1"=>["value1"],+"param2"=>["value2"],+"param3"=>["value3"]}|1081053|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/stdlib/libdoc/cgi/rdoc/classes/CGI.html#M000075^0|0|5|1Z|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|A|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

I think you want to turn any given URL string into a HASH?

You can try <a href="http://www.ruby-doc.org/stdlib/libdoc/cgi/rdoc/classes/CGI.html#M000075" rel="noreferrer">http://www.ruby-doc.org/stdlib/libdoc/cgi/rdoc/classes/CGI.html#M000075</a>

<pre><code>require 'cgi'

CGI::parse('param1=value1&amp;param2=value2&amp;param3=value3')
</code></pre>

returns

<pre><code>{"param1"=&gt;["value1"], "param2"=&gt;["value2"], "param3"=&gt;["value3"]}
</code></pre>

blocks|key|1296065|text|我发现自己最近的一个项目也需要同样的东西。在Levi的解决方案的基础上，这里有一个更干净更快的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296066|Rack::Utils.parse_nested_query+'param1=value1&param2=value2&param3=value3'
#+=>+{"param1"=>"value1",+"param2"=>"value2",+"param3"=>"value3"}|code-block|syntax|javascript|1296067|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|$]]

I found myself needing the same thing for a recent project.
Building on Levi's solution, here's a cleaner and faster method:

<pre><code>Rack::Utils.parse_nested_query 'param1=value1&amp;param2=value2&amp;param3=value3'
# =&gt; {"param1"=&gt;"value1", "param2"=&gt;"value2", "param3"=&gt;"value3"}
</code></pre>

blocks|key|1081153|text|只是改进了上面的Levi答案-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081154|Rack::Utils.parse_query+URI("http://example.com?par=hello&par2=bye").query|code-block|syntax|javascript|1081155|对于类似于上述url的字符串，它将返回|1081156|{+"par"+=>+"hello",+"par2"+=>+"bye"+}+|1081157|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|$]]

Just Improved with Levi answer above - 

<pre><code>Rack::Utils.parse_query URI("http://example.com?par=hello&amp;par2=bye").query
</code></pre>

For a string like above url, it will return

<pre><code>{ "par" =&gt; "hello", "par2" =&gt; "bye" } 
</code></pre>

blocks|key|1296156|text|对于纯Ruby解决方案，将URI.parse与CGI.parse结合使用(即使不需要Rails/Rack等，也可以使用)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1296157|CGI.parse(URI.parse(url).query)+
#+=>++{"name1"+=>+["value1"],+"name2"+=>+["value1",+"value2",+...]+}|code-block|syntax|javascript|1296158|entityMap^0|D|9|N|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

For a pure Ruby solution combine <code>URI.parse</code> with <code>CGI.parse</code> (this can be used even if Rails/Rack etc. are not required):

<pre><code>CGI.parse(URI.parse(url).query) 
# =&gt; {"name1" =&gt; ["value1"], "name2" =&gt; ["value1", "value2", ...] }
</code></pre>

blocks|key|1296194|text|有不止一种方法可以解决你的问题。其他人已经向你展示了一些技巧。我知道另一个诀窍。这是我的尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296195|require+'uri'
url+=+"http://www.example.com/something?param1=value1&param2=value2&param3=value3"
uri+=+URI(url)
#+=>+#<URI::HTTP:0x89e4898+URL:http://www.example.com/something?param1=value1&param2=value2&param3=value3>
URI::decode_www_form(uri.query).to_h+#+if+you+are+in+2.1+or+later+version+of+Ruby
#+=>+{"param1"=>"value1",+"param2"=>"value2",+"param3"=>"value3"}
Hash[URI::decode_www_form(uri.query)]+#+if+you+are+below+2.1+version+of+Ruby
#+=>+{"param1"=>"value1",+"param2"=>"value2",+"param3"=>"value3"}|code-block|syntax|javascript|1296196|阅读::decode_www_form的方法说明。|offset|length|style|CODE|1296197|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/stdlib-2.1.0/libdoc/uri/rdoc/URI.html#method-c-decode_www_form^0|0|0|2|H|2|H|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

There more than one ways, to solve your problem. Others has shown you the some tricks. I know another trick. Here is my try :-

<pre><code>require 'uri'
url = "http://www.example.com/something?param1=value1&amp;param2=value2&amp;param3=value3"
uri = URI(url)
# =&gt; #&lt;URI::HTTP:0x89e4898 URL:http://www.example.com/something?param1=value1&amp;param2=value2&amp;param3=value3&gt;
URI::decode_www_form(uri.query).to_h # if you are in 2.1 or later version of Ruby
# =&gt; {"param1"=&gt;"value1", "param2"=&gt;"value2", "param3"=&gt;"value3"}
Hash[URI::decode_www_form(uri.query)] # if you are below 2.1 version of Ruby
# =&gt; {"param1"=&gt;"value1", "param2"=&gt;"value2", "param3"=&gt;"value3"}
</code></pre>

Read the method docomentation of <a href="http://www.ruby-doc.org/stdlib-2.1.0/libdoc/uri/rdoc/URI.html#method-c-decode_www_form" rel="noreferrer"><code>::decode_www_form</code></a>.

blocks|key|1296235|text|看看Ruby一个流行的addressable+URI模块的替代品，它使得查询解析变得很容易：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1296236|require+"addressable/uri"
uri+=+Addressable::URI.parse("http://www.example.com/something?param1=value1&param2=value2&param3=value3")
uri.query_values['param1']
=>+'value1'|code-block|syntax|javascript|1296237|(与URI不同，它显然还处理参数编码/解码)|1296238|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/sporkmonger/addressable^0|B|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Check out the <a href="https://github.com/sporkmonger/addressable" rel="noreferrer">addressable</a> gem - a popular replacement for Ruby's URI module that makes query parsing easy:

<pre><code>require "addressable/uri"
uri = Addressable::URI.parse("http://www.example.com/something?param1=value1&amp;param2=value2&amp;param3=value3")
uri.query_values['param1']
=&gt; 'value1'
</code></pre>

(It also apparently handles param encoding/decoding, unlike URI)

blocks|key|1296277|text|您也可以使用此方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296278|require+'uri'
require+'cgi'
uri+=+URI("https://example.com/?query=1&q=2&query=5")
a+=+CGI::parse(uri.query)
puts+a+++++++++++++++++++#=>+{"query"=>["1",+"5"],+"q"=>["2"]}
puts+a["query"].to_s+++++#=>+["1",+"5"]
puts+a["query"][0]+++++++#=>++1
puts+a["query"][1]+++++++#=>++5
puts+a["q"][0]+++++++++++#=>++2|code-block|syntax|javascript|1296279|它更安全，也更容易|1296280|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

you can also use this method
<pre class="lang-rb prettyprint-override"><code>
require 'uri'
require 'cgi'
uri = URI(&quot;https://example.com/?query=1&amp;q=2&amp;query=5&quot;)
a = CGI::parse(uri.query)
puts a #=&gt; {&quot;query&quot;=&gt;[&quot;1&quot;, &quot;5&quot;], &quot;q&quot;=&gt;[&quot;2&quot;]}
puts a[&quot;query&quot;].to_s #=&gt; [&quot;1&quot;, &quot;5&quot;]
puts a[&quot;query&quot;][0] #=&gt; 1
puts a[&quot;query&quot;][1] #=&gt; 5
puts a[&quot;q&quot;][0] #=&gt; 2


</code></pre>
its safe and much easier

blocks|key|1081439|text|不幸的是，当试图从错误URL中提取查询参数时，URI和addressable库都崩溃了。例如，这会破坏以下两项：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1081440|http://localhost:4300/webapp/foo/#//controller/action?account=001-001-111&email=john%2540email.com|code-block|syntax|javascript|1081441|在Arthur+/Levi的解决方案的基础上，使用url.split("?").try(:last)，您可以只获取URL的查询参数部分，并使用Rack::Utils.parse_nested_query将该参数字符串解析为散列。|1081442|或完整的：|1081443|Rack::Utils.parse_nested_query(url.split("?").try(:last))|1081444|在我的示例中返回：|1081445|{"account":+"001-001-111",+"email":+"john@email.com"}|1081446|entityMap^0|N|3|R|B|0|0|P|P|1Z|U|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|17|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|18|8|@]|D|@]|E|$I|J]]|$1|Q|3|R|5|6|7|19|8|@]|D|@]|E|$]]|$1|S|3|T|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|U|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|V|$]]

Sadly both the <code>URI</code> and <code>addressable</code> libraries break when attempting to extract query params from buggy URLs. E.g. this breaks both:
<pre><code>http://localhost:4300/webapp/foo/#//controller/action?account=001-001-111&amp;email=john%40email.com
</code></pre>
Building on Arthur / Levi's solution, with <code>url.split(&quot;?&quot;).try(:last)</code> you can grab just the query param portion of the URL, and use <code>Rack::Utils.parse_nested_query</code> to parse that string of parameters into a hash.
Or in full:
<pre class="lang-rb prettyprint-override"><code>Rack::Utils.parse_nested_query(url.split(&quot;?&quot;).try(:last))
</code></pre>
returning in my example:
<pre><code>{&quot;account&quot;: &quot;001-001-111&quot;, &quot;email&quot;: &quot;john@email.com&quot;}
</code></pre>

blocks|key|1296370|text|在Ruby2.7/3中使用CGI可能是一种过时的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296371|以下是使用URI完成此操作的一种简单方法：|1296372|uri+=+URI.parse+'https://duckduckgo.com/?q=ruby%2Bprogramming%2Blanguage'
params+=+Hash[URI.decode_www_form+uri.query]
#+=>+{"q"=>"ruby+programming+language"}+|code-block|syntax|javascript|1296373|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Using CGI might be an outdated approach with Ruby 2.7/3.
Here's a neat way to do this with URI:
<pre class="lang-rb prettyprint-override"><code>uri = URI.parse 'https://duckduckgo.com/?q=ruby+programming+language'
params = Hash[URI.decode_www_form uri.query]
# =&gt; {&quot;q&quot;=&gt;&quot;ruby programming language&quot;} 
</code></pre>

I have some URLs, like

<pre><code>http://www.example.com/something?param1=value1&amp;param2=value2&amp;param3=value3
</code></pre>

and I would like to extract the parameters from these URLs and get them in a Hash. Obviously, I could use regular expressions, but I was just wondering if there was easier ways to do that with Ruby or Rails. I haven't found anything in the Ruby module <code>URI</code> but perhaps I missed something.

In fact, I need a method that would do that:

<pre><code>extract_parameters_from_url("http://www.example.com/something?param1=value1&amp;param2=value2&amp;param3=value3")
#=&gt; {:param1 =&gt; 'value1', :param2 =&gt; 'value2', :param3 =&gt; 'value3'}
</code></pre>

Would you have some advices?

How to extract URL parameters from a URL with Ruby or Rails?

我有一些URL，比如http://www.example.com/something?param1=value1&param2=value2&param3=value3我想从这些URL中提取参数，并将它们放入Hash中。显然，我可以使用正则表达式，但我只是想知道是否有更简单的方法来使用Ruby或Rails。我在Ruby...

问如何使用Ruby或Rails从URL中提取URL参数？
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