method
collection_cache_key
v5.1.7 -
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Class: CollectionCacheKey
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collection_cache_key(collection = all, timestamp_column = :updated_at)
public
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# File activerecord/lib/active_record/collection_cache_key.rb, line 3 def collection_cache_key(collection = all, timestamp_column = :updated_at) # :nodoc: query_signature = Digest::MD5.hexdigest(collection.to_sql) key = "#{collection.model_name.cache_key}/query-#{query_signature}" if collection.loaded? || collection.distinct_value size = collection.records.size if size > 0 timestamp = collection.max_by(×tamp_column)._read_attribute(timestamp_column) end else column_type = type_for_attribute(timestamp_column.to_s) column = "#{connection.quote_table_name(collection.table_name)}.#{connection.quote_column_name(timestamp_column)}" select_values = "COUNT(*) AS #{connection.quote_column_name("size")}, MAX(%s) AS timestamp" if collection.has_limit_or_offset? query = collection.spawn query.select_values = [column] subquery_alias = "subquery_for_cache_key" subquery_column = "#{subquery_alias}.#{timestamp_column}" subquery = query.arel.as(subquery_alias) arel = Arel::SelectManager.new(query.engine).project(select_values % subquery_column).from(subquery) else query = collection.unscope(:order) query.select_values = [select_values % column] arel = query.arel end result = connection.select_one(arel, nil, query.bound_attributes) if result.blank? size = 0 timestamp = nil else size = result["size"] timestamp = column_type.deserialize(result["timestamp"]) end end if timestamp "#{key}-#{size}-#{timestamp.utc.to_s(cache_timestamp_format)}" else "#{key}-#{size}" end end