How can I pass a variable to a partial which is shared with another controller?

Question

I have a User model and a Profile model. A User has_one Profile and a Profile belongs_to User.

From within app/views/users/show.html.erb, I would like to display the user's associated profile details.

I created a partial at app/views/profiles/shared/_show.html.erb. It contains:

<p>
  <strong>Title:</strong>
  <%= @profile.title %>
</p>

I am trying to include this partial from within app/views/users/show.html.erb like so (as recommended in the API documentation):

<%= render partial: 'profiles/shared/show', locals: { profile: @user.profile }%>

However, I keep getting the error:

undefined method `title' for nil:NilClass

If I remove the <%= @profile.title %> line from the partial, it renders correctly (so I assume the path is correct).

I have also checked that @user.profile contains a valid Profile object. It does.

What am I missing? How can I pass a variable to a partial which is shared with another controller?

Aw man, you rock! That was it. If you add that as an answer, I'll accept it. — James Hibbard
– James Hibbard, Commented Oct 15, 2015 at 9:36

Roman Kiselenko · Accepted Answer · 2015-10-15 09:38:25Z

3

locals option in the render method, make a new variable with value from the hash locals: { foo: @bar }, instead of shared @ instance variable.

answered Oct 15, 2015 at 9:38

Roman Kiselenko

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Comments

Minato · Accepted Answer · 2015-10-15 09:38:33Z

3

just remove the @ from @profile.title as it is not a instance variable but a local variable so you don't need @

Note: do have a check in that partial for safety.

answered Oct 15, 2015 at 9:38

Minato

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4 Comments

James Hibbard Over a year ago

"Note: do have a check in that partial for safety." — Could you expand on that? What should I check?

Minato Over a year ago

you said its shared between controllers. so you'll have to be sure a profile is passed everytime to the partial. else the code'll break.

James Hibbard Over a year ago

Sorry man, promised it to Зелёный before you replied (see comments).

Minato Over a year ago

@JackZelig No problem dude.. The important thing is that you got your answer. :)

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