Counting comments for individual threads

I’m working on a simple cookbook app, and users can leave comments. I’d
like to show the number of comments for each recipe in the list of
recipes. So far I can only get the count to show the total number of
comments in the comments database; I can’t figure out how to get it to
read the recipe_id column in the comments field so it only spits out the
number of comments that relates to each recipe_id.

Here’s what I have so far:

recipes_controller.rb:

def comment_count
Comment.count
end
helper_method :comment_count

list.rhtml

<% for recipe in @recipes %>
<%= recipe.title %>
<%= comment_count %>
<% end %>

Thanks!!

Dave A. wrote:

I’m working on a simple cookbook app, and users can leave comments. I’d
like to show the number of comments for each recipe in the list of
recipes. So far I can only get the count to show the total number of
comments in the comments database; I can’t figure out how to get it to
read the recipe_id column in the comments field so it only spits out the
number of comments that relates to each recipe_id.

See
http://api.rubyonrails.org/classes/ActiveRecord/Calculations/ClassMethods.html

There’s a bunch of documentation on the parameters and conditions count
can accept.

A.

recipe.comments.count

You can pass additonal conditions into that, so you could for example do

recipe.comments.count :conditions => [‘validated = ?’, true]

To only show comments that have been validated, if you had a system
where comments were not visible until approved.

Fred

def comment_count
Comment.count(:conditions => "recipe_id = " + self.id.to_s)
end

Might not be the best solution, but it should work (you can read about
that in the API reference, just search for ‘count’ and
‘ActiveRecord::Calculations’).

Christoph

Kitto wrote:

def comment_count
Comment.count(:conditions => "recipe_id = " + self.id.to_s)
end

Might not be the best solution, but it should work (you can read about
that in the API reference, just search for ‘count’ and
‘ActiveRecord::Calculations’).

Christoph

Hi, I tried this solution, and I got an error that said:

Mysql::Error: #42S22Unknown column ‘conditionsrecipe_id’

It seems like it’s combining :conditions and recipe_id when it’s
SELECTing from the database. Is there a weird syntax thing going on?

I tried the solution above:

recipe.comments.count

but I got an error: undefined local variable or method `recipe’

I tried it with Recipe capitalized and got: undefined method `comments’

I know that Recipes and Comments are wired together correctly, because
when I post a comment it enters the correct recipe_id. I just don’t
know why this simple counting thing doesn’t work. The resources about
count were helpful, though, and I guess I’ll keep trying things.

Frederick C. wrote:

I tried the solution above:

recipe.comments.count

but I got an error: undefined local variable or method `recipe’

well you just didn’t have a recipe variable available at the time. If
you still sticking this in your comment_count helper then that makes
perfect sense, as you are not supplying it with a recipe object.

personally I wouldn’t bother with the helper and would just have

<% for recipe in @recipes %>
<%= recipe.title %>
<%= recipe.comments.count %>
<% end %>

Fred

Yes, thank you, that was the solution I was looking for. I don’t know
why I insisted on the helper.

I tried the solution above:

recipe.comments.count

but I got an error: undefined local variable or method `recipe’

well you just didn’t have a recipe variable available at the time. If
you still sticking this in your comment_count helper then that makes
perfect sense, as you are not supplying it with a recipe object.

personally I wouldn’t bother with the helper and would just have

<% for recipe in @recipes %>
<%= recipe.title %>
<%= recipe.comments.count %>
<% end %>

Fred

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