Activeadmin: the model of the parent resource page must be associated with a name equal to the name of the child resource page
the RegionCountry model must be associated with city names (since the child resource page generates a controller named CityController)
How do I customize the name of an association?
trace:
NoMethodError (undefined method `cities' for #<RegionCountry:0x0000000605f158>):
activemodel (4.0.9) lib/active_model/attribute_methods.rb:439:in `method_missing'
activerecord (4.0.9) lib/active_record/attribute_methods.rb:168:in `method_missing'
inherited_resources (1.5.1) lib/inherited_resources/base_helpers.rb:184:in `end_of_association_chain'
app / admin / region_city.rb
ActiveAdmin.register RegionCity, as: 'City' do
permit_params :name, :description, :country_id
menu false
belongs_to :country, parent_class: RegionCountry
navigation_menu :default
filter :id_eq
end
r / admin / region_country.rb
ActiveAdmin.register RegionCountry, as: 'Country' do
permit_params :name, :description
filter :id_eq
sidebar 'Links', only: [:show] do
ul do
li do
link_to 'Cities', admin_country_cities_path(country_id: resource.id)
end
end
end
end
app / models / region_city.rb
class RegionCity < ActiveRecord::Base
belongs_to :country, class_name: RegionCountry, foreign_key: :country_id
validates :name, presence: true
validates :country, presence: true
end
app / models / region_country.rb
class RegionCountry < ActiveRecord::Base
validates :name, presence: true
has_many :reg_cities, class_name: RegionCity, foreign_key: :country_id
end
Gemfile.lock
GIT
remote: git://github.com/gregbell/active_admin.git
revision: a2cd9604c2d949f5193791045385756cee0c6865
but if we changed app / models / region_city.rb like this:
class RegionCountry < ActiveRecord::Base
validates :name, presence: true
has_many :cities, class_name: RegionCity, foreign_key: :country_id # this line was changed
end
it works fine
here is a test app that repeats the error: https://github.com/senid231/activeadmin_test_belongs_to/tree/rename_child
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By default, Inherited Resources (used by ActiveAdmin) involves collecting the name to mirror the resource name, which will ResourceCountry#cities
and explain the undefined method error. Changing the default values in the controller will fix the problem:
ActiveAdmin.register RegionCity, as: 'City' do
belongs_to :country, parent_class: RegionCountry
controller do
# Instruct inherited_resources on how to find the collection from the
# parent resource (by default it is assumed to be `:cities`); instead
# use `:reg_cities` as the name of the collection (from
# `RegionCountry#reg_cities`):
defaults collection_name: :reg_cities
end
end
See the inherited resource documentation for overriding default settings for more information. detail.
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