How to return a string for rails view
Use method in helper to hide or show a link accordingly. The method new_cate? works as designed. However the method link_to_edit? causes the following error:
undefined local variable or method `cate' for #<#<Class:0x4ed6a10>:0x4ed2d38>
Extracted source (around line #23):
20: <tr>
21: <td><%= cate.name %></td>
22: <td><%= cate.description %></td>
23: <td><%= link_to_edit? %>></td>
24:
25: </tr>
26: <% end %>
Here is the code:
in index.html.erb
<body>
<h2>Category</h2>
<table>
<tr>
<th>Category</th>
<th>Description</th>
</tr>
<% @categories.each do |cate| %>
<tr>
<td><%= cate.name %></td>
<td><%= cate.description %></td>
<td><%= link_to_edit? %>></td>
</tr>
<% end %>
</table>
<%= new_cate? %>
</body>
in categories_helper.rb
def new_cate?
if session[:eng_dh]
return link_to 'New Category', new_category_path开发者_JAVA技巧
end
end
def link_to_edit?
if session[:eng_dh]
return link_to 'Edit', edit_category_path(cate)
end
end
The code following "return" seems weird. new_cate? works as designed. But link_to_edit? does not.
Any thoughts? Thanks.
You are referring to a method scope variable (which is not yet declared in that scope).
I guess what you want is
#in controller
def link_to_edit cate
if session[:eng_dh]
return link_to 'Edit', edit_category_path(cate)
end
end
#in view
<% @categories.each do |cate| %>
<tr>
<td><%= cate.name %></td>
<td><%= cate.description %></td>
<td><%= link_to_edit cate %>></td>
</tr>
<% end %>
There is a problem in your link_to_edit function.
In your view pass the variable cate.
<td><%= link_to_edit(cate) %></td>
and in the controller
def link_to_edit(cate)
if session[:eng_dh]
return link_to 'Edit', edit_category_path(cate)
end
end
加载中,请稍侯......
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