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109 lines
3.5 KiB
109 lines
3.5 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is a project management system.
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# Copyright (C) 2012-2018 the OpenProject Foundation (OPF)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2017 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See docs/COPYRIGHT.rdoc for more details.
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#++
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require Rails.root.join('config/constants/project_activity')
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module Project::Activity
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def self.included(base)
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base.send :extend, Scopes
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end
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module Scopes
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def register_latest_project_activity(on:, chain: [], attribute:)
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Constants::ProjectActivity.register(on: on,
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chain: chain,
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attribute: attribute)
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end
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def latest_project_activity
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@latest_project_activity ||=
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Constants::ProjectActivity.registered.map { |params|
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build_latest_project_activity_for(on: params[:on],
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chain: params[:chain],
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attribute: params[:attribute])
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}
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end
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def with_latest_activity
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Project
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.select('projects.*')
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.select('activity.latest_activity_at')
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.joins("LEFT JOIN (#{latest_activity_sql}) activity ON projects.id = activity.project_id")
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end
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def latest_activity_sql
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<<-SQL
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SELECT project_id, MAX(updated_at) latest_activity_at
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FROM (#{all_activity_provider_union_sql}) activity
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GROUP BY project_id
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SQL
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end
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def all_activity_provider_union_sql
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latest_project_activity.join(' UNION ALL ')
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end
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def build_latest_project_activity_for(on:, chain:, attribute:)
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join_chain = Array(chain).dup.push(on)
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from = join_chain.first
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joins = build_joins_from_chain(join_chain)
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<<-SQL
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SELECT project_id, MAX(#{on.table_name}.#{attribute}) updated_at
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FROM #{from.table_name}
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#{joins.join(' ')}
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WHERE #{on.table_name}.#{attribute} IS NOT NULL
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GROUP BY project_id
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SQL
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end
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def build_joins_from_chain(join_chain)
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joins = []
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(0..join_chain.length - 2).each do |i|
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joins << build_join(join_chain[i + 1],
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join_chain[i])
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end
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joins
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end
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def build_join(right, left)
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associations = right.reflect_on_all_associations
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association = associations.detect { |a| a.class_name == left.to_s }
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<<-SQL
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LEFT OUTER JOIN #{right.table_name}
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ON #{left.table_name}.id =
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#{right.table_name}.#{association.foreign_key}
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SQL
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end
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end
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end
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