tool_setting.rb

# Copyright (C) 2014 Instructure, Inc.
#
# This file is part of Canvas.
#
# Canvas is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, version 3 of the License.
#
# Canvas 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 Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#

module Lti
  class ToolSetting < ActiveRecord::Base
    belongs_to :tool_proxy
    belongs_to :context, polymorphic: [:course, :account]

    validates_presence_of :tool_proxy
    validates_presence_of :context, if: :has_resource_link_id?

    serialize :custom

    private
    def has_resource_link_id?
      resource_link_id.present?
    end

    def self.custom_settings(tool_proxy_id, context, resource_link_id)
      tool_settings = ToolSetting.where('tool_proxy_id = ? and ((context_type = ? and context_id =?) OR context_id IS NULL) and (resource_link_id = ? OR resource_link_id IS NULL)',
                                        tool_proxy_id, context.class.to_s, context.id, resource_link_id).
        order('context_id NULLS FIRST, resource_link_id NULLS FIRST').pluck(:custom).compact
      (tool_settings.present? && tool_settings.inject { |custom, h| custom.merge(h)}) || {}
    end

  end
end