93 lines
2.4 KiB
Ruby
93 lines
2.4 KiB
Ruby
#
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# Copyright (C) 2014 - present Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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class GroupLeadership
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attr_reader :group
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def initialize(target_group)
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@group = target_group
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end
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def member_changed_event(membership)
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revoke_leadership_if_necessary(membership)
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propogate_event_for_prior_groups(membership)
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if auto_leader_enabled? && leadership_spot_empty?
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auto_assign!(category.auto_leader)
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end
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end
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def auto_assign!(strategy)
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return if valid_leader_in_place?
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group.update_attribute(:leader, select_leader(strategy))
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end
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private
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def select_leader(strategy)
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return users.first if strategy == "first"
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return users.sample if strategy == "random"
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raise(ArgumentError, "Unknown auto leader strategy: '#{strategy}'")
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end
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def valid_leader_in_place?
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group.leader.present? && member_ids.include?(group.leader_id)
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end
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def propogate_event_for_prior_groups(membership)
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old_id = membership.old_group_id
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if old_id && old_id != group.id
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propogation_target = self.class.new(Group.find(membership.old_group_id))
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propogation_target.member_changed_event(membership)
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end
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end
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def leadership_spot_empty?
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group.reload.leader_id.nil?
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end
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def auto_leader_enabled?
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category && category.auto_leader.present?
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end
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def revoke_leadership_if_necessary(membership)
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if no_longer_member?(membership)
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user_id = membership.user_id
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group.update_attribute(:leader_id, nil) if group.leader_id == user_id
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end
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end
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def no_longer_member?(membership)
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!membership_ids.include?(membership.id)
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end
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def category
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group.group_category
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end
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def users
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group.users
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end
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def member_ids
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group.group_memberships.pluck(:user_id)
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end
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def membership_ids
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group.reload.group_memberships.pluck(:id)
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end
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end
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