有没有办法列出Ruby ERB模板中的可用变量? [英] Is there a way to list the available variables in an Ruby ERB template?
问题描述
假设我有一个名为 my_template.html.erb 的Ruby ERB模板,其中包含以下内容:
Suppose I have a Ruby ERB template named my_template.html.erb, and it contains the following:
<div><%= @div_1 %></div>
<div><%= @div_2 %></div>
<div><%= @div_3 %></div>
是否可以通过编程方式列出模板中所有可用的变量?
Is there a way I can programatically list out all the available variables in the template?
例如,以下方法:
def list_out_variables
template = File.open("path_to/my_template.html.erb", "rb").read
erb = ERB.new( template )
erb.this_method_would_list_out_variables
end
将返回以下内容:
['div1','div2','div3']
任何帮助将不胜感激
谢谢,
Mike
Thanks, Mike
推荐答案
要获取可用于.erb文件的变量列表(从控制器):
在erb中添加断点:
<% debugger %>
然后输入实例变量以查看所有可用的实例变量。
Then type instance_variables in the debugger to see all of the available instance variables.
添加:请注意, instance_variables 是Ruby类Object及其所有子类中的一种方法。 (如@mikezter所指出。)因此,如果您确实愿意,可以从软件内部以编程方式调用该方法,而不是使用调试器。
Added: Note that instance_variables is a method available from the Ruby class Object and all of its subclasses. (As noted by @mikezter.) So you could call the method programmatically from within your sw rather than using the debugger if you really wanted to.
您会回来的当前对象的实例变量列表。
You'll get back a list of instance variables for the current object.
已添加:获取.erb文件使用的变量列表:
# <template> is loaded with the entire contents of the .erb file as
# one long string
var_array = template.scan(/(\@[a-z]+[0-9a-z]*)/i).uniq
这篇关于有没有办法列出Ruby ERB模板中的可用变量?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!