How do I see tags for all users on a model instance?

I am using acts-as-taggable on. Two models: User and Posts.

Posts belongs_to :user
User has_many :posts

Posts acts-as-taggable. Users acts-as-tagger

All of this is straightforward and is working. However, I have a use-case which may be outside of how this plugin works.

I want Posts to be able to be tagged by multiple users. When a tag is created on a post from a user, it does not show when you do the following:

p = Post.first
p.tag_list # this returns []

If you look at the SQL being generated it selects records where 'tagger_id' is NULL. The tagger_id is, of course, the user_id in this case and开发者_如何学Python is very much not NULL.

If you back into it, however, you can get what you want.

p = Post.find(1) # get a post to work with
p.tags_from(p.user) # returns an array of the tags: ['cats','dogs','wildebeasts']

This works.

Now, the problem is I want another user to be able to come along and add a tag to the post. Maybe this user will think it is helpful. Let's just assume it makes sense to do so. Could be a moderator... whatever.

Given the above, how would I get a list of all the tags on a given post assuming that more than one user added tags?

Gratefully,

NJ

I don't know anything about the plug-in you specified and I'm still learning Rails. But I don't think

p = Post.tag_list

would be what you want, anyways. You're asking for a taglist of the Post class rather than the taglist of a particular post. For example, if users have 'email' and 'name' columns, you also couldn't do:

u = User.names
u = User.emails

It doesn't really make sense. But you could do something like:

User.column_names
#=> ["id", "email", "hashed_password", "created_at", "updated_at"]

Because that's a class method. Now, maybe tag_list is a class method, but it looks like it's used to find orphaned tags or something due to how it looks for null tag_givers.

But since I'm still new to Rails and I also don't know how your plugin works, here are some things you can try off the top of my head:

p = Post.find(1)
p.tag_list # p.column_name_of_the_column_that_holds_the_tags should work
# or, maybe pass in ALL users as an array
p.tags_from(User.all)

Lemme know what those do.

Maybe I'm missing something but:

p = Post.tag_list # this returns []

#should be 
#...
@post.find params[:id]
#...    
@post.tag_list

You're currently calling tag_list on the post class, rather than an instance of it.