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module ActiveRecord
class PredicateBuilder
class PolymorphicArrayHandler # :nodoc:
def initialize(predicate_builder)
@predicate_builder = predicate_builder
end
def call(attribute, value)
predicates = value.queries.map { |query| predicate_builder.build_from_hash(query) }
if predicates.size > 1
type_and_ids_predicates = predicates.map { |type_predicate, id_predicate| Arel::Nodes::Grouping.new(type_predicate.and(id_predicate)) }
type_and_ids_predicates.inject(&:or)
else
predicates.first
end
end
# TODO Change this to private once we've dropped Ruby 2.2 support.
# Workaround for Ruby 2.2 "private attribute?" warning.
protected
attr_reader :predicate_builder
end
class PolymorphicArrayValue # :nodoc:
attr_reader :associated_table, :values
def initialize(associated_table, values)
@associated_table = associated_table
@values = values
end
def queries
type_to_ids_mapping.map do |type, ids|
{
associated_table.association_foreign_type.to_s => type,
associated_table.association_foreign_key.to_s => ids
}
end
end
private
def type_to_ids_mapping
default_hash = Hash.new { |hsh, key| hsh[key] = [] }
values.each_with_object(default_hash) { |value, hash| hash[base_class(value).name] << convert_to_id(value) }
end
def primary_key(value)
associated_table.association_primary_key(base_class(value))
end
def base_class(value)
case value
when Base
value.class.base_class
when Relation
value.klass.base_class
end
end
def convert_to_id(value)
case value
when Base
value._read_attribute(primary_key(value))
when Relation
value.select(primary_key(value))
end
end
end
end
end
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