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module ActiveRecord
module CollectionCacheKey
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?
size = collection.size
timestamp = collection.max_by(×tamp_column).public_send(timestamp_column)
else
column_type = type_for_attribute(timestamp_column.to_s)
column = "#{connection.quote_table_name(collection.table_name)}.#{connection.quote_column_name(timestamp_column)}"
query = collection
.select("COUNT(*) AS size", "MAX(#{column}) AS timestamp")
.unscope(:order)
result = connection.select_one(query)
size = result["size"]
timestamp = column_type.deserialize(result["timestamp"])
end
if timestamp
"#{key}-#{size}-#{timestamp.utc.to_s(cache_timestamp_format)}"
else
"#{key}-#{size}"
end
end
end
end
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