Rails if statement syntax

Question

I've written the following ERB and am getting a syntax error at the question mark. This helper function from devise currently evaluates as false. What have I missed?

<%= if user_signed_in? %>
<%= render 'form' %>
<%= end %>

Note that '?' and '!' are **valid** characters in method names. — , Jul 15 '11 at 11:14

score 87 · Accepted Answer · edited Apr 10 '18 at 21:04

87

Try this :

<% if user_signed_in? %>
  <%= render 'form' %>
<% end %>

If you do <%= ... %>, it will try to output the thing you put between the tags. But, if you do <% ... %>, then no output is processed, just the code is evaluated. If this is not working, then there is probably something wrong with your user_signed_in? helper method.

edited Apr 10 '18 at 21:04

KZcoding

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answered Jul 15 '11 at 11:08

SteenhouwerD

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score 27 · Answer 2 · answered Jul 15 '11 at 12:40

27

<%= will try to output your user_signed_in? helper, so try:

<% if user_signed_in? %>
  <%= render 'form' %>
<% end %>

or even better (and less confusing):

<%= render 'form' if user_signed_in? %>

answered Jul 15 '11 at 12:40

Mario Uher

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2

Thanks for describing the difference between `<%=` and `<%` – lislis Apr 28 '16 at 19:18

Mahesh · Answer 3 · 2018-02-15T16:42:45.340

2

try this

<% if user_signed_in? %>
    <%= render 'form' %>
<% end %>

edited Feb 15 '18 at 16:42

answered Jul 15 '11 at 11:59

Mahesh

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Rails if statement syntax

3 Answers3

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