Ok so I have a few models that need to interact with each other -
Blog, Post, and User. I'll get their relationships out of the way:
Blog
has_many :posts
has_and_belongs_to_many :users (by way of a join table, a blog can
have many contributing users)
Post
belongs_to :blog
belongs_to :user (the author of the post)
User
has_and_belongs_to_many :blogs (a user can contribute to many blogs)
has_many :posts
I'm running into a problem when validating posts; I want to ensure
that the logged in user we find in the session is listed as a
contributor to the blog they are trying to post to. I added some
validation to my Post model, that appears to be failing when editing
an existing post. Post creation, curiously, seems to pass the
validation test.
I should note that @user is a variable set by my ApplicationController
using a before_filter. really sure what's going on here, so any help
is appreciated. I'm guessing the @user set by my app controller
probably isn't accessible by the Post class.
Anyhow, here's my Post model:
class Post < ActiveRecord::Base
belongs_to :blog
belongs_to :user
has_many :comments
validate :user_can_contribute
private
def user_can_contribute
if @user.nil?
logger.info("@user hasn't been set yet!")
end
if !blog.users.include?(@user)
errors.add(:user, "You cannot contribute to this blog.")
end
end
end
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