module ReplicaPools::QueryCache
duck-types with ActiveRecord::ConnectionAdapters::QueryCache but relies on ActiveRecord::Base.query_cache for state so we don't fragment the cache across multiple connections
we could use more of ActiveRecord's QueryCache
if it only used accessors for its internal ivars.
Public Instance Methods
select_all(*args)
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select_all
is trickier. it needs to use the leader connection for cache logic, but ultimately pass its query through to whatever connection is current.
# File lib/replica_pools/query_cache.rb, line 23 def select_all(*args) # there may be more args for Rails 5.0+, but we only care about arel, name, and binds for caching. relation, name, raw_binds = args # Rails 6.2 breaks this method as locked? is no longer available # https://github.com/kickstarter/replica_pools/issues/26 if !query_cache_enabled || locked?(relation) return route_to(current, :select_all, *args) end # duplicate binds_from_relation behavior introduced in 4.2. if raw_binds.blank? && relation.is_a?(ActiveRecord::Relation) arel, binds = relation.arel, relation.bind_values else arel, binds = relation, Array(raw_binds) end sql = to_sql(arel, binds) args[0] = sql args[2] = binds if Gem::Version.new(ActiveRecord.version) < Gem::Version.new('5.1') cache_sql(sql, binds) { route_to(current, :select_all, *args) } else cache_sql(sql, name, binds) { route_to(current, :select_all, *args) } end end