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module ActiveRecord
module Associations
class SingularAssociation < Association #:nodoc:
# Implements the reader method, e.g. foo.bar for Foo.has_one :bar
def reader(force_reload = false)
if force_reload
klass.uncached { reload }
elsif !loaded? || stale_target?
reload
end
target
end
# Implements the writer method, e.g. foo.bar= for Foo.belongs_to :bar
def writer(record)
replace(record)
end
def create(attributes = {}, &block)
_create_record(attributes, &block)
end
def create!(attributes = {}, &block)
_create_record(attributes, true, &block)
end
def build(attributes = {})
record = build_record(attributes)
yield(record) if block_given?
set_new_record(record)
record
end
private
def create_scope
scope.scope_for_create.stringify_keys.except(klass.primary_key)
end
def find_target
scope.take.tap { |record| set_inverse_instance(record) }
end
# Implemented by subclasses
def replace(record)
raise NotImplementedError, "Subclasses must implement a replace(record) method"
end
def set_new_record(record)
replace(record)
end
def _create_record(attributes, raise_error = false)
record = build_record(attributes)
yield(record) if block_given?
saved = record.save
set_new_record(record)
raise RecordInvalid.new(record) if !saved && raise_error
record
end
end
end
end
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