Module: HasFriends::InstanceMethods

Defined in:
lib/has_friends.rb

Instance Method Summary collapse

Instance Method Details

#be_friends_with(friend) ⇒ Object 



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# File 'lib/has_friends.rb', line 20

def be_friends_with(friend)
  # no user object
  return nil, Friendship::STATUS_FRIEND_IS_REQUIRED unless friend

  # should not create friendship if user is trying to add himself
  return nil, Friendship::STATUS_IS_YOU if is?(friend)

  # should not create friendship if users are already friends
  return nil, Friendship::STATUS_ALREADY_FRIENDS if friends?(friend)

  # retrieve the friendship request
  friendship = self.friendship_for(friend)

  # let's check if user has already a friendship request or have removed
  request = friend.friendship_for(self)

  # friendship has already been requested
  return nil, Friendship::STATUS_ALREADY_REQUESTED if friendship && friendship.requested?

  # friendship is pending so accept it
  if friendship && friendship.pending?
    friendship.accept!
    request.accept!

    return friendship, Friendship::STATUS_FRIENDSHIP_ACCEPTED
  end

  # we didn't find a friendship, so let's create one!
  friendship = self.friendships.create(:friend_id => friend.id, :status => 'requested')

  # we didn't find a friendship request, so let's create it!
  request = friend.friendships.create(:friend_id => id, :status => 'pending')

  return friendship, Friendship::STATUS_REQUESTED
end

#destroy_friendship_with(friend) ⇒ Object

Destroyes (in both ways) the friendship



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# File 'lib/has_friends.rb', line 84

def destroy_friendship_with(friend)
  friendship = friendship_for(friend)
  other_friendship = friend.friendship_for(self)
  friendship.destroy
  other_friendship.destroy
end

#friends?(friend) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/has_friends.rb', line 56

def friends?(friend)
  friendship = friendship_for(friend)
  friendship && friendship.accepted?
end

#friends_in_common_with(user) ⇒ Object 



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# File 'lib/has_friends.rb', line 69

def friends_in_common_with(user)
  self.friends.select { |friend| user.friends.include?(friend) }
end

#friends_not_in_common_with(user) ⇒ Object 



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# File 'lib/has_friends.rb', line 73

def friends_not_in_common_with(user)
  self.friends.reject { |friend| user.friends.include?(friend) or user == friend }
end

#friends_of_friends ⇒ Object 



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# File 'lib/has_friends.rb', line 77

def friends_of_friends
  self.friends.collect do |friend|
    friend.friends_not_in_common_with(self)
  end.flatten.uniq
end

#friendship_for(friend) ⇒ Object 



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# File 'lib/has_friends.rb', line 61

def friendship_for(friend)
  friendships.first :conditions => {:friend_id => friend.id}
end

#is?(friend) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/has_friends.rb', line 65

def is?(friend)
  self.id == friend.id
end