equals.rb

#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) the OpenProject GmbH
#
# 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
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# GNU General Public License for more details.
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# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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# See COPYRIGHT and LICENSE files for more details.
#++

module Queries::Operators
  class Equals < Base
    label "equals"
    set_symbol "="

    def self.sql_for_field(values, db_table, db_field)
      # code expects strings (e.g. for quoting), but ints would work as well: unify them here
      values = values.map(&:to_s)

      sql = ""

      if values.present?
        if values.include?("-1")
          sql = "#{db_table}.#{db_field} IS NULL OR "
        end

        sql += "#{db_table}.#{db_field} IN (" +
               values.map { |val| "'#{connection.quote_string(val)}'" }.join(",") + ")"
      else
        # empty set of allowed values produces no result
        sql = "0=1"
      end

      sql
    end
  end
end