OpenProject is the leading open source project management software.
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openproject/app/models/project/activity.rb

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#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# See doc/COPYRIGHT.rdoc for more details.
#++
require Rails.root.join('config/constants/project_activity')
module Project::Activity
def self.included(base)
base.send :extend, Scopes
end
module Scopes
def register_latest_project_activity(on:, chain: [], attribute:)
Constants::ProjectActivity.register(on: on,
chain: chain,
attribute: attribute)
end
def latest_project_activity
@latest_project_activity ||=
Constants::ProjectActivity.registered.map { |params|
build_latest_project_activity_for(on: params[:on],
chain: params[:chain],
attribute: params[:attribute])
}
end
def with_latest_activity
Project
.select('projects.*, activity.latest_activity_at')
.joins("LEFT JOIN (#{latest_activity_sql}) activity ON projects.id = activity.project_id")
end
def latest_activity_sql
<<-SQL
SELECT project_id, MAX(updated_at) latest_activity_at
FROM (#{all_activity_provider_union_sql}) activity
GROUP BY project_id
SQL
end
def all_activity_provider_union_sql
latest_project_activity.join(' UNION ALL ')
end
def build_latest_project_activity_for(on:, chain:, attribute:)
join_chain = Array(chain).dup.push(on)
from = join_chain.first
joins = build_joins_from_chain(join_chain)
<<-SQL
SELECT project_id, MAX(#{on.table_name}.#{attribute}) updated_at
FROM #{from.table_name}
#{joins.join(' ')}
WHERE #{on.table_name}.#{attribute} IS NOT NULL
GROUP BY project_id
SQL
end
def build_joins_from_chain(join_chain)
joins = []
(0..join_chain.length - 2).each do |i|
joins << build_join(join_chain[i + 1],
join_chain[i])
end
joins
end
def build_join(right, left)
associations = right.reflect_on_all_associations
association = associations.detect { |a| a.class_name == left.to_s }
<<-SQL
LEFT OUTER JOIN #{right.table_name}
ON #{left.table_name}.id =
#{right.table_name}.#{association.foreign_key}
SQL
end
end
end