Module: Optic::Rails

Defined in:
lib/optic/rails.rb,
lib/optic/rails/railtie.rb,
lib/optic/rails/version.rb

Defined Under Namespace

Classes: Railtie

Constant Summary collapse

VERSION = 
"1.3.3"

Class Method Summary collapse

Class Method Details

.entities(logger) ⇒ Object 



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# File 'lib/optic/rails.rb', line 8

def entities(logger)
  with_connection do
    {
      schema_version: ActiveRecord::Migrator.current_version,
      entities: active_record_klasses.map do |klass|
        begin
          logger.debug "Inspecting entity #{klass}"
          {
            name: klass.name,
            table_name: klass.table_name,
            entity_attribute_names: klass.attribute_names,
            table_exists: klass.table_exists?,
            associations: klass.reflect_on_all_associations.map do |reflection|
              begin
                logger.debug "Inspecting association #{klass}/#{reflection.name}"
                {
                  name: reflection.name,
                  macro: reflection.macro,
                  options: reflection.options.map { |k, v| [k, v.to_s] }.to_h,
                  klass_name: reflection.options[:polymorphic] ? nil : reflection.klass.name,
                }
              rescue
                nil
              end
            end.compact
          }
        rescue
          nil
        end
      end.compact
    }
  end
end

.metrics(logger, instructions) ⇒ Object 



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# File 'lib/optic/rails.rb', line 42

def metrics(logger, instructions)
  with_connection do |connection|
    instructions.map do |instruction|
      logger.debug "Gathering metrics for metric_configuration_id = #{instruction['metric_configuration_id']}"
      name = instruction["entity"]
      entity = entity_for_entity_name name

      query =
        if pivot_name = instruction["pivot"]
          # TODO this is a terrible hack to extract zero-valued pivot
          # instances. The right thing to do is select from the pivot
          # table and LEFT OUTER JOIN to the entity table, which results
          # in a much simpler query, but it means we have to rewrite the
          # pathfinding logic in the server to find paths using has_many
          # associations instead of belongs_to associations, which might
          # be less accurate for a bunch of reasons. For now, we're doing
          # an INNER JOIN selecting from the entity table and then
          # selecting every possible pivot value as a UNION, throwing out
          # the duplicates.
          pivot = entity_for_entity_name pivot_name
          join_path = instruction["join_path"]
          joins = join_path.reverse.map(&:to_sym).inject { |acc, elt| { elt => acc } }

          columns = [
            %Q|#{qualified_primary_key(connection, pivot)} AS primary_key|,
            %Q|#{qualified_entity_column(connection, pivot, instruction["pivot_attribute_name"])} AS pivot_attribute_name|,
          ]

          join_select = entity
                        .joins(joins)
                        .group(qualified_primary_key(connection, pivot))
                        .select(*columns, 'COUNT(*) AS count')
                        .to_sql

          instance_select = pivot
                            .select(*columns, '0 AS count')
                            .to_sql

          union_sql = <<~"SQL"
                        SELECT pivot_values.primary_key, pivot_values.pivot_attribute_name, MAX(pivot_values.count) AS count
                          FROM (#{join_select} UNION ALL #{instance_select}) AS pivot_values
                          GROUP BY pivot_values.primary_key, pivot_values.pivot_attribute_name
                      SQL
        else
          entity.select('COUNT(*) as count').to_sql
        end

      { metric_configuration_id: instruction["metric_configuration_id"], result: connection.exec_query(query).to_a }
    end
  end
end