7dfffac3db
* Add comment referencing Fastly gem * Create purgable concern and include it * Typo: deprecate --> deprecated * Include Purgable on the Tag model * Rename Purgable to Purgeable * Reorganize fastly and service methods in Purgeable * Add and fix specs * Add development env guards
52 lines
1.8 KiB
Ruby
52 lines
1.8 KiB
Ruby
class ApplicationRecord < ActiveRecord::Base
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self.abstract_class = true
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include Purgeable
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QUERY_ESTIMATED_COUNT = <<~SQL.squish.freeze
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SELECT (
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(reltuples / GREATEST(relpages, 1)) *
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(pg_relation_size(?) / (GREATEST(current_setting('block_size')::integer, 1)))
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)::bigint AS count
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FROM pg_class WHERE relname = ?;
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SQL
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# Computes an estimated count of the number of rows using stats collected by VACUUM
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# inspired by <https://www.citusdata.com/blog/2016/10/12/count-performance/#dup_counts_estimated_full>
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# and <https://stackoverflow.com/a/48391562/4186181>
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def self.estimated_count
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query = sanitize_sql_array([QUERY_ESTIMATED_COUNT, table_name, table_name])
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result = connection.execute(query)
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count = result.first["count"]
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result.clear # PG::Result is manually managed in memory, we need to release its resources
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count
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end
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# Decorate object with appropriate decorator
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def decorate
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self.class.decorator_class.new(self)
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end
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def decorated?
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false
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end
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# Decorate collection with appropriate decorator
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def self.decorate
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decorator_class.decorate_collection(all)
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end
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# Infers the decorator class to be used by (e.g. `User` maps to `UserDecorator`).
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# adapted from https://github.com/drapergem/draper/blob/157eb955072a941e6455e0121fca09a989fcbc21/lib/draper/decoratable.rb#L71
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def self.decorator_class(called_on = self)
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prefix = respond_to?(:model_name) ? model_name : name
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decorator_name = "#{prefix}Decorator"
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decorator_name_constant = decorator_name.safe_constantize
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return decorator_name_constant unless decorator_name_constant.nil?
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return superclass.decorator_class(called_on) if superclass.respond_to?(:decorator_class)
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raise UninferrableDecoratorError, "Could not infer a decorator for #{called_on.class.name}."
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end
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end
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