diff options
Diffstat (limited to 'activerecord/lib/active_record/associations/preloader.rb')
-rw-r--r-- | activerecord/lib/active_record/associations/preloader.rb | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/activerecord/lib/active_record/associations/preloader.rb b/activerecord/lib/active_record/associations/preloader.rb index 9f77f38b35..a18994cec4 100644 --- a/activerecord/lib/active_record/associations/preloader.rb +++ b/activerecord/lib/active_record/associations/preloader.rb @@ -54,8 +54,6 @@ module ActiveRecord autoload :BelongsTo, "active_record/associations/preloader/belongs_to" end - NULL_RELATION = Struct.new(:values, :where_clause, :joins_values).new({}, Relation::WhereClause.empty, []) - # Eager loads the named associations for the given Active Record record(s). # # In this description, 'association name' shall refer to the name passed @@ -93,7 +91,6 @@ module ActiveRecord def preload(records, associations, preload_scope = nil) records = Array.wrap(records).compact.uniq associations = Array.wrap(associations) - preload_scope = preload_scope || NULL_RELATION if records.empty? [] @@ -147,7 +144,7 @@ module ActiveRecord def preloaders_for_one(association, records, scope) grouped_records(association, records).flat_map do |reflection, klasses| klasses.map do |rhs_klass, rs| - loader = preloader_for(reflection, rs, rhs_klass).new(rhs_klass, rs, reflection, scope) + loader = preloader_for(reflection, rs).new(rhs_klass, rs, reflection, scope) loader.run self loader end @@ -159,6 +156,7 @@ module ActiveRecord records.each do |record| next unless record assoc = record.association(association) + next unless assoc.klass klasses = h[assoc.reflection] ||= {} (klasses[assoc.klass] ||= []) << record end @@ -180,20 +178,11 @@ module ActiveRecord end end - class NullPreloader # :nodoc: - def self.new(klass, owners, reflection, preload_scope); self; end - def self.run(preloader); end - def self.preloaded_records; []; end - def self.owners; []; end - end - # Returns a class containing the logic needed to load preload the data # and attach it to a relation. For example +Preloader::Association+ or # +Preloader::HasManyThrough+. The class returned implements a `run` method # that accepts a preloader. - def preloader_for(reflection, owners, rhs_klass) - return NullPreloader unless rhs_klass - + def preloader_for(reflection, owners) if owners.first.association(reflection.name).loaded? return AlreadyLoaded end |