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# frozen_string_literal: true
module ActiveRecord
module Associations
class SingularAssociation < Association #:nodoc:
# Implements the reader method, e.g. foo.bar for Foo.has_one :bar
def reader
if !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 build(attributes = {})
record = build_record(attributes)
yield(record) if block_given?
set_new_record(record)
record
end
# Implements the reload reader method, e.g. foo.reload_bar for
# Foo.has_one :bar
def force_reload_reader
klass.uncached { reload }
target
end
private
def create_scope
scope.scope_for_create.stringify_keys.except(klass.primary_key)
end
def find_target
scope = self.scope
return scope.take if skip_statement_cache?(scope)
conn = klass.connection
sc = reflection.association_scope_cache(conn, owner) do
StatementCache.create(conn) { |params|
as = AssociationScope.create { params.bind }
target_scope.merge!(as.scope(self)).limit(1)
}
end
binds = AssociationScope.get_bind_values(owner, reflection.chain)
sc.execute(binds, klass, conn) do |record|
set_inverse_instance record
end.first
rescue ::RangeError
nil
end
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)
unless owner.persisted?
raise ActiveRecord::RecordNotSaved, "You cannot call create unless the parent is saved"
end
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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