Class: ActiveRecord::Associations::Preloader::Association
- Inherits:
-
Object
- Object
- ActiveRecord::Associations::Preloader::Association
- Defined in:
- lib/composite_primary_keys/associations/preloader/association.rb
Instance Method Summary collapse
- #associated_records_by_owner(preloader) ⇒ Object
- #load_slices(slices) ⇒ Object
- #owners_by_key ⇒ Object
- #query_scope(ids) ⇒ Object
Instance Method Details
#associated_records_by_owner(preloader) ⇒ Object
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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 17 def associated_records_by_owner(preloader) owners_map = owners_by_key # CPK # owner_keys = owners_map.keys.compact owner_keys = if reflection.foreign_key.is_a?(Array) owners.map do |owner| Array(owner_key_name).map do |owner_key| owner[owner_key] end end.compact.uniq else owners_map.keys.compact end # Each record may have multiple owners, and vice-versa records_by_owner = owners.each_with_object({}) do |owner,h| h[owner] = [] end if owner_keys.any? # Some databases impose a limit on the number of ids in a list (in Oracle it's 1000) # Make several smaller queries if necessary or make one query if the adapter supports it sliced = owner_keys.each_slice(klass.connection.in_clause_length || owner_keys.size) records = load_slices sliced records.each do |record, owner_key| owners_map[owner_key].each do |owner| records_by_owner[owner] << record end end end records_by_owner end |
#load_slices(slices) ⇒ Object
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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 52 def load_slices(slices) @preloaded_records = slices.flat_map { |slice| records_for(slice) } @preloaded_records.map { |record| # CPK #[record, record[association_key_name]] owner_key = Array(association_key_name).map do |key_name| record[key_name] end.join(CompositePrimaryKeys::ID_SEP) [record, owner_key] } end |
#owners_by_key ⇒ Object
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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 67 def owners_by_key @owners_by_key ||= if key_conversion_required? owners.group_by do |owner| # CPK # owner[owner_key_name].to_s key = Array(owner_key_name).map do |key_name| owner[key_name] end.join(CompositePrimaryKeys::ID_SEP) end else owners.group_by do |owner| # CPK # owner[owner_key_name] key = Array(owner_key_name).map do |key_name| owner[key_name] end.join(CompositePrimaryKeys::ID_SEP) end end end |
#query_scope(ids) ⇒ Object
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# File 'lib/composite_primary_keys/associations/preloader/association.rb', line 5 def query_scope(ids) # CPK # scope.where(association_key.in(ids)) if reflection.foreign_key.is_a?(Array) predicate = cpk_in_predicate(table, reflection.foreign_key, ids) scope.where(predicate) else scope.where(association_key.in(ids)) end end |