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. — user142019
– user142019, Commented Jul 15, 2011 at 11:14

KZcoding · Accepted Answer · 2018-04-10 21:04:43Z

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, 2018 at 21:04

KZcoding

1,5374 gold badges16 silver badges27 bronze badges

answered Jul 15, 2011 at 11:08

SteenhouwerD

1,8071 gold badge16 silver badges22 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Mario Uher · Accepted Answer · 2011-07-15 12:40:50Z

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, 2011 at 12:40

Mario Uher

12.4k5 gold badges46 silver badges69 bronze badges

1 Comment

lislis Over a year ago

Thanks for describing the difference between <%= and <%

Mahesh · Accepted Answer · 2018-02-15 16:42:45Z

2

try this

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

edited Feb 15, 2018 at 16:42

answered Jul 15, 2011 at 11:59

Mahesh

6,4462 gold badges30 silver badges35 bronze badges

Collectives™ on Stack Overflow

Rails if statement syntax

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related