[英]Rails - Pass options into a helper method that accepts a block?
I have a helper that creates mailer template rows (html). 我有一个创建邮件模板行(html)的助手。 I want to be able to pass in styles to the row (optionally), like a background color. 我希望能够将样式传递给行(可选),例如背景色。
module MailHelper
def module_row(&block)
h << "<table border='0' cellpadding='0' cellspacing='0' width='100%'>"
# more table html here
h << capture(&block)
# more table html here
h << "</table>"
raw h
end
end
I want to be able to optionally pass in a background color, but I can't seem to figure out how to do that while passing in the '&block'. 我希望能够有选择地传递背景色,但是在传递“&block”时似乎无法弄清楚该如何做。 Is this possible in Ruby? 在Ruby中有可能吗?
You sure can! 你当然可以!
module MailHelper
def module_row(options={}, &block)
...
if options[:foo]
do_foo_stuff
end
end
end
<% module_row(foo: true) do |x| %>
...
<% end %>
Common practice is to define defaults like this: 常见的做法是定义默认值,如下所示:
def module_row(options={}, &block)
opts = {
foo: true,
background_color: 'black'
}.merge!(options)
if opts[:foo]
do_foo_stuff
end
end
You can pass options as a Hash well, like: 您可以将选项作为哈希很好地传递,例如:
module MailHelper
def module_row(**opts, &block)
bgcolor = opts[:bgcolor] || '#FFFFFF'
...
h << "<table border='0' cellpadding='0' cellspacing='0' width='100%'>"
# more table html here
h << capture(&block)
# more table html here
h << "</table>"
raw h
end
end
Then you can call: 然后,您可以致电:
module_row(bgcolor: '#AAAAAA', &my_block)
or: 要么:
module_row(bgcolor: '#AAAAAA') { block content }
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.