Rails：带有块和 GET 参数的 link_to？
如何在 link_to 块声明中实现查询字符串和 URL 参数？现在，我有这个，它可以工作：
<%= link_to 'Edit', :edit, :type => 'book', :id => book %>
上面的工作，和输出：
http://localhost:3000/books/edit/1?type=book
我想做的是这样的：
<% link_to :edit, :type => 'book', :id => book do %>
...
<% end %>
但是上面的格式输出：
http://localhost:3000/books/edit/
这不是我正在寻找的......我想要它像前面的例子一样输出一个 URL。
我怎样才能实现这个目标？
How can I achieve query string and URL parameters in a link_to block declaration? Right now, I have this, which works:
<%= link_to 'Edit', :edit, :type => 'book', :id => book %>
The above works, and outputs:
http://localhost:3000/books/edit/1?type=book
What I want to do is something like this:
<% link_to :edit, :type => 'book', :id => book do %>
...
<% end %>
But the above format outputs:
http://localhost:3000/books/edit/
Which isn't what I'm looking for... I want it to output a URL like the previous example.
How can I achieve this?
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评论（4）
link_to采用相同的选项url_for会这样做。话虽如此，没有正如所述Tom 在对此答案的回复中，将块传递给:type选项，并且它并不真正接受块，所以我的猜测是你的第二个示例起作用的原因是因为它位于 a 的范围内图书视图。link_to可以用作第一个参数（链接文本）的替换。如果 Book 是一种资源，您可以通过向
link_to帮助程序传递 Rails 为您提供的方便的自动生成资源路由之一来生成您要查找的 URL。在尝试此操作之前运行rake paths：否则，您可以明确说明要链接到的控制器/操作：
Happy hacking。
编辑：差点忘了，您可以在声明要链接的对象的 id 之后添加绕过它们的查询字符串。
将产生
/books/1/edit?query1=value&query2=value。或者：link_totakes the same options thaturl_fordoes.Having said that, there is noAs mentioned by Tom in a reply to this answer, passing a block to:typeoption and it doesn't really accept blocks, so my guess is that the reason the your second example works is because it's located within the scope of a Book view.link_tocan be used as a replacement for the first argument (the link text).If Book is a resource, you can get the
link_tohelper to generate the URL you're looking for by passing it one of the handy, automatically generated resource routes rails makes for you. Runrake routesbefore you try this:Otherwise, you can explicitly state what controller/action you want to link to:
Happy hacking.
EDIT: Almost forgot, you CAN add query strings bypassing them in AFTER you declare the id of the object you're linking to.
Would product
/books/1/edit?query1=value&query2=value. Alternatively:尝试以下方式
或实现相同的 url 使用
Try Follwing
or to achieve same url Use
Ruby 不知道您是将
do ... end块发送到link_to还是book，而是将其发送到book因为它离街区更近。book do ... end返回nil，因此您只剩下link_to :edit, :type=>'book', :id=>;无。您需要将参数括起来，当您使用它时，我会使用控制器、操作、id 设置重写它以使其更易于理解：link_to{:controller=>"books",:action= >"编辑",:id=>书}做...结束Ruby doesn't know if you're sending the
do ... endblock tolink_toorbook, and is sending it tobookbecause it is closer to the block.book do ... endreturnsnil, so you're left withlink_to :edit, :type=>'book', :id=>nil. You will need to bracket the parameters, and while you're at it, I would rewrite it to be more understandable with a controller, action, id setup:link_to{:controller=>"books",:action=>"edit",:id=>book}do ... end在 mime_types.rb 文件中添加：
Mime::Type.register "text/application", :book
in mime_types.rb file add:
Mime::Type.register "text/application", :book