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110 lines
3.8 KiB
110 lines
3.8 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) 2012-2014 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) 2006-2013 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 doc/COPYRIGHT.rdoc for more details.
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#++
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# This migration aggregates the migrations passed in migrations into one given as a block
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# heredoc
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module Migration
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class MigrationSquasher
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class IncompleteMigrationsError < ::StandardError
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end
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#define all the following methods as class methods
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class << self
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def squash(aggregated_versions)
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intersection = aggregated_versions & all_versions
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if intersection == []
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# No migrations that this migration aggregates have already been
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# applied. In this case, run the aggregated migration passed as a block
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yield
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elsif intersection == aggregated_versions
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# All migrations that this migration aggregates have already
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# been applied. In this case, remove the information about those
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# migrations from the schema_migrations table and we're done.
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ActiveRecord::Base.connection.execute <<-SQL + (intersection.map { |version| <<-CONDITIONS }).join(" OR ")
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DELETE FROM
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#{quoted_schema_migrations_table_name}
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WHERE
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SQL
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#{version_column_for_comparison} = #{quote_value(version)}
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CONDITIONS
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else
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missing = aggregated_versions - intersection
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# Only a part of the migrations that this migration aggregates
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# have already been applied. In this case, fail miserably.
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raise IncompleteMigrationsError, <<-MESSAGE.split("\n").map(&:strip!).join(" ") + "\n"
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It appears you are migrating from an incompatible version.
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Your database has only some migrations to be squashed.
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Please update your installation to a version including all the
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aggregated migrations and run this migration again.
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The following migrations are missing: #{missing}
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MESSAGE
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end
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end
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private
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def all_versions
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table = Arel::Table.new(schema_migrations_table_name)
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ActiveRecord::Base.connection.select_values(table.project(table['version']))
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end
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def schema_migrations_table_name
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ActiveRecord::Migrator.schema_migrations_table_name
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end
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def quoted_schema_migrations_table_name
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ActiveRecord::Base.connection.quote_table_name(schema_migrations_table_name)
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end
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def quoted_version_column_name
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ActiveRecord::Base.connection.quote_table_name("version")
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end
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def version_column_for_comparison
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"#{quoted_schema_migrations_table_name}.#{quoted_version_column_name}"
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end
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def quote_value s
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ActiveRecord::Base.connection.quote(s)
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end
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end
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end
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end
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