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module ActiveRecord
class PredicateBuilder
class AssociationQueryHandler # :nodoc:
def self.value_for(table, column, value)
associated_table = table.associated_table(column)
klass = if associated_table.polymorphic_association? && ::Array === value && value.first.is_a?(Base)
PolymorphicArrayValue
else
AssociationQueryValue
end
klass.new(associated_table, value)
end
def initialize(predicate_builder)
@predicate_builder = predicate_builder
end
def call(attribute, value)
queries = {}
table = value.associated_table
if value.base_class
queries[table.association_foreign_type.to_s] = value.base_class.name
end
queries[table.association_foreign_key.to_s] = value.ids
predicate_builder.build_from_hash(queries)
end
protected
attr_reader :predicate_builder
end
class AssociationQueryValue # :nodoc:
attr_reader :associated_table, :value
def initialize(associated_table, value)
@associated_table = associated_table
@value = value
end
def ids
case value
when Relation
value.select(primary_key)
when Array
value.map { |v| convert_to_id(v) }
else
convert_to_id(value)
end
end
def base_class
if associated_table.polymorphic_association?
@base_class ||= polymorphic_base_class_from_value
end
end
private
def primary_key
associated_table.association_primary_key(base_class)
end
def polymorphic_base_class_from_value
case value
when Relation
value.klass.base_class
when Array
val = value.compact.first
val.class.base_class if val.is_a?(Base)
when Base
value.class.base_class
end
end
def convert_to_id(value)
case value
when Base
value._read_attribute(primary_key)
else
value
end
end
end
end
end
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