Heroku was acting up on a problem that I didn’t encounter on a developing environment. Apparently, when you create an attribute on a model, it does not come with internally usable setter for that attribute. Here is the explanation for problem I had.
I have a model called Topic. A Topic has a column called last_post_id. In topics_controller, I had to use setter method for last_post_id to assign it a value. See the line @topic.last_post_id = Post.count + 1
def create
@forum = Forum.find(params[:forum_id])
@topic = @forum.topics.build(params[:topic])
@topic.last_post_id = Post.count + 1
if @topic.save
flash[:success] = "Success!"
redirect_to topic_posts_path(@topic)
else
render 'new'
end
end
I thought that a setter and an accessor should be automatically available once you create an attribute of a model, but on Heroku, this doesn’t work.
So I had to make accessor and setter for last_post_id available in Topic model.
class Topic < ActiveRecord::Base
...
attr_accessible :last_post_id
...
end
