Sha256: cb9b05490e79e8139a3e678b32c04449db5d510e69f6a1c6d2c29e8a08045023
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Size: 1.25 KB
Versions: 8
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Stored size: 1.25 KB
Contents
# Extends has_one associations to allow for a :default option.
#
# This will make the page.article association always build a default article
# unless an article is already set or persisted.
#
# class Page < ActiveRecord::Base
# has_one :article, :default => :build_default_article
#
# def build_default_article
# build_article(:title => 'default title', :body => 'default body')
# end
# end
#
# Note that we also include a default scope that includes the associated record
# to avoid n+1 queries.
module ActiveRecord
module Associations
module HasOneDefault
def has_one(association_id, options = {})
default = options.delete(:default)
super
has_one_default(association_id, default) if default
end
def has_one_default(association_id, default)
default_scope includes(association_id) rescue nil # would raise during migrations. how to remove the rescue clause?
validates_presence_of association_id
define_method(:"#{association_id}_with_default") do
send(:"#{association_id}_without_default") || send(:"#{association_id}=", send(default))
end
alias_method_chain association_id, :default
end
ActiveRecord::Base.extend(self)
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems