View helpers

rubyonrails-talk
1

Hi all,

I am trying to get my head around using view helpers.

My app has a Posters Model and I am allowing Users to vote on the best poster using a Votes model. Posters are in three categories.

I want to build a filter to make sure people can only vote once in each Poster Category.

The Vote entry has user_id (integer), poster_id(integer), category (string)

On a simple level I want to start with a filter in my view file to only display the 'Vote' link if an entry does not exist for the current_user and relevant category.

I tried adding the following to my PostersHelper but kept getting wrong number of arguments (0 for 1)

code below.

Any advice on this type of filter would be much appreciated.

2

Try this as code:

module PostersHelper def already_voted_arts Vote.exists?[‘user_id = ? AND category = ?’, current_user.id , “Arts”] end end

3

Mmm. I still get

wrong number of arguments (0 for 1)

Extracted source (around line #8):

5: <p>Due to the large number of entries we received voting has been extended until 31 January 2010. Thank you to all of our <%=link_to "sponsors", poster_sponsors_path%> for supporting our competition.</p> 6: 7: <h2>Arts and Humanities</h2> 8: <%if already_voted_arts%> 9: <p>You have already voted in this category</p> 10: <%else%> 11: <p><b><%=link_to "Place your Arts and Humanities vote now", poster_arts_vote_path%></b></p>

4

def already_voted_arts   !Vote.find_by_user_id_and_category(current_user.id, "Arts").blank? end

5

Fantastic - that worked.

Thank you.

Dan