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# frozen_string_literal: true
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
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.limit_value || collection.offset_value
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(subquery).project(select_values % subquery_column)
else
query = collection.unscope(:order)
query.select_values = [select_values % column]
arel = query.arel
end
result = connection.select_one(arel, nil)
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
end
end
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