method
compute_cache_version
v7.1.3.4 -
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Class: ActiveRecord::Relation
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compute_cache_version(timestamp_column)
private
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# File activerecord/lib/active_record/relation.rb, line 393 def compute_cache_version(timestamp_column) # :nodoc: timestamp_column = timestamp_column.to_s if loaded? size = records.size if size > 0 timestamp = records.map { |record| record.read_attribute(timestamp_column) }.max end else collection = eager_loading? ? apply_join_dependency : self column = connection.visitor.compile(table[timestamp_column]) select_values = "COUNT(*) AS #{connection.quote_column_name("size")}, MAX(%s) AS timestamp" if collection.has_limit_or_offset? query = collection.select("#{column} AS collection_cache_key_timestamp") query._select!(table[Arel.star]) if distinct_value && collection.select_values.empty? subquery_alias = "subquery_for_cache_key" subquery_column = "#{subquery_alias}.collection_cache_key_timestamp" arel = query.build_subquery(subquery_alias, select_values % subquery_column) else query = collection.unscope(:order) query.select_values = [select_values % column] arel = query.arel end size, timestamp = connection.select_rows(arel, nil).first if size column_type = klass.type_for_attribute(timestamp_column) timestamp = column_type.deserialize(timestamp) else size = 0 end end if timestamp "#{size}-#{timestamp.utc.to_fs(cache_timestamp_format)}" else "#{size}" end end