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class Usergroup < ActiveRecord::Base
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include Authorization
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has_many_polymorphs :members, :from => [:usergroups, :users ], :as => :member,
:through => :usergroup_member, :foreign_key => :usergroup_id, :dependent => :destroy

has_many :hosts, :as => :owner
validates_uniqueness_of :name
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before_destroy EnsureNotUsedBy.new(:hosts, :usergroups)
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# The text item to see in a select dropdown menu
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alias_attribute :select_title, :to_s
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default_scope :order => 'LOWER(usergroups.name)'
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validate :ensure_uniq_name
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# This methods retrieves all user addresses in a usergroup
# Returns: Array of strings representing the user's email addresses
def recipients
all_users.map(&:mail).flatten.sort.uniq
end

# This methods retrieves all users in a usergroup
# Returns: Array of users
def all_users(group_list=[self], user_list=[])
retrieve_users_and_groups group_list, user_list
user_list.sort.uniq
end

# This methods retrieves all usergroups in a usergroup
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# Returns: Array of unique usergroups
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def all_usergroups(group_list=[self], user_list=[])
retrieve_users_and_groups group_list, user_list
group_list.sort.uniq
end

protected
# Recurses down the tree of usergroups and finds the users
# [+group_list+]: Array of Usergroups that have already been processed
# [+users+] : Array of users accumulated at this point
# Returns : Array of non unique users
def retrieve_users_and_groups(group_list, user_list)
for group in usergroups
next if group_list.include? group
group_list << group

group.retrieve_users_and_groups(group_list, user_list)
end
user_list.concat users
end

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def ensure_uniq_name
errors.add :name, "is already used by a user account" if User.where(:login => name).first
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end

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def as_json(options={})
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super({:only => [:name, :id]})
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end

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end