diff options
Diffstat (limited to 'activerecord/lib/active_record/relation')
| -rw-r--r-- | activerecord/lib/active_record/relation/finder_methods.rb | 6 | ||||
| -rw-r--r-- | activerecord/lib/active_record/relation/record_fetch_warning.rb | 49 |
2 files changed, 51 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb index 7bd091b66c..6a3a56f1cc 100644 --- a/activerecord/lib/active_record/relation/finder_methods.rb +++ b/activerecord/lib/active_record/relation/finder_methods.rb @@ -5,7 +5,7 @@ module ActiveRecord ONE_AS_ONE = '1 AS one' # Find by id - This can either be a specific id (1), a list of ids (1, 5, 6), or an array of ids ([5, 6, 10]). - # If no record can be found for all of the listed ids, then RecordNotFound will be raised. If the primary key + # If one or more records can not be found for the requested ids, then RecordNotFound will be raised. If the primary key # is an integer, find by id coerces its arguments using +to_i+. # # Person.find(1) # returns the object for ID = 1 @@ -16,8 +16,6 @@ module ActiveRecord # Person.find([1]) # returns an array for the object with ID = 1 # Person.where("administrator = 1").order("created_on DESC").find(1) # - # <tt>ActiveRecord::RecordNotFound</tt> will be raised if one or more ids are not found. - # # NOTE: The returned records may not be in the same order as the ids you # provide since database rows are unordered. You'd need to provide an explicit <tt>order</tt> # option if you want the results are sorted. @@ -378,7 +376,7 @@ module ActiveRecord def construct_relation_for_association_calculations from = arel.froms.first if Arel::Table === from - apply_join_dependency(self, construct_join_dependency) + apply_join_dependency(self, construct_join_dependency(joins_values)) else # FIXME: as far as I can tell, `from` will always be an Arel::Table. # There are no tests that test this branch, but presumably it's diff --git a/activerecord/lib/active_record/relation/record_fetch_warning.rb b/activerecord/lib/active_record/relation/record_fetch_warning.rb new file mode 100644 index 0000000000..14e1bf89fa --- /dev/null +++ b/activerecord/lib/active_record/relation/record_fetch_warning.rb @@ -0,0 +1,49 @@ +module ActiveRecord + class Relation + module RecordFetchWarning + # When this module is prepended to ActiveRecord::Relation and + # `config.active_record.warn_on_records_fetched_greater_than` is + # set to an integer, if the number of records a query returns is + # greater than the value of `warn_on_records_fetched_greater_than`, + # a warning is logged. This allows for the detection of queries that + # return a large number of records, which could cause memory bloat. + # + # In most cases, fetching large number of records can be performed + # efficiently using the ActiveRecord::Batches methods. + # See active_record/lib/relation/batches.rb for more information. + def exec_queries + QueryRegistry.reset + + super.tap do + if logger && warn_on_records_fetched_greater_than + if @records.length > warn_on_records_fetched_greater_than + logger.warn "Query fetched #{@records.size} #{@klass} records: #{QueryRegistry.queries.join(";")}" + end + end + end + end + + ActiveSupport::Notifications.subscribe("sql.active_record") do |*args| + payload = args.last + + QueryRegistry.queries << payload[:sql] + end + + class QueryRegistry # :nodoc: + extend ActiveSupport::PerThreadRegistry + + attr_accessor :queries + + def initialize + reset + end + + def reset + @queries = [] + end + end + end + end +end + +ActiveRecord::Relation.prepend ActiveRecord::Relation::RecordFetchWarning |