Question

This is some of the information provided by the docs for dynamic tag contexts in acts_as_taggable_on…

@user = User.new(:name => "Bobby")
@user.set_tag_list_on(:customs, "same, as, tag, list")
@user.tag_list_on(:customs) # => ["same","as","tag","list"]
@user.save
@user.tags_on(:customs) # => [<Tag name='same'>,...]
@user.tag_counts_on(:customs)
User.tagged_with("same", :on => :customs) # => [@user]

My question is how do I get a compliment of the custom tag list that I create. I want :tags – :customs, that is the set of all tags minus the specified tags of customs.

Answer 1

From their Github page:

# Find a user that's not tagged with awesome or cool:
User.tagged_with(["awesome", "cool"], :exclude => true)

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Update

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You could try:

customs_tags = @user.tag_list_on(:customs)
user_tags = @user.tag_list
new_tags = user_tags - customs_tags

@user.set_tag_list_on(:customs, new_tags)