Your question is wrong. You should not be rendering a form for :interactions (which will be an AR::Relation) using an array. You should rather be initializing the controller_action.interactions directly, and remove the second parameter in the fields_for call.
-- Dheeraj Kumar On Sunday 24 March 2013 at 7:07 PM, jle...@socit.co.uk wrote: > So what should be returned instead ? > > On Sunday, 24 March 2013 12:20:49 UTC, jle...@socit.co.uk > (http://socit.co.uk) wrote: > > Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for and > > nested attributes. > > > > class ControllerAction < ActiveRecord::Base > > has_many :interactions, dependent: :destroy > > has_many :roles, through: :interactions > > > > scope :controllers, lambda {|name| where("controller_name_id = ?", > > name)} > > scope :actions, lambda {|name| where("action_name_id = ?", name)} > > > > def initialized_interactions() # this is the key method > > [].tap do |o| > > Role.all.each do |r| > > if p = interactions.find { |p| p.role_id == r.id (http://r.id) } > > o << p.tap { |p| p.enable ||= true } > > else > > o << Interaction.new(:role_id => r.id (http://r.id)) > > end > > end > > end > > end > > end > > > > class Role < ActiveRecord::Base > > has_many :interactions > > end > > > > class Interaction < ActiveRecord::Base > > belongs_to :controller_action > > belongs_to :role > > attr_accessor :enable # nice little thingy here > > # It is now recommended to use strong params instead of > > 'attr_accessible :enable, :controller_action_id, :role_id' > > end > > > > controller_actions_controller.rb > > ... > > private > > # Use callbacks to share common setup or constraints between > > actions. > > def set_controller_action > > @controller_action = ControllerAction.find(params[:id]) > > end > > > > # Never trust parameters from the scary internet, only allow the > > white list through. > > def controller_action_params > > params.require(:controller_action).permit! > > end > > > > controller_actions view - excluding error code and most css formatting. > > _form.rb > > > > <%= form_for(@controller_action) do |f| %> > > ... > > <%= f.label :name %><br /> > > <%= f.text_field :name %> > > > > <h2><%= f.label :role %></h2> > > <%= f.fields_for :interactions, > > @controller_action.initialized_interactions() do |builder| %> > > <% role = builder.object.role %> > > <%= builder.hidden_field :role_id %> > > > > <%= builder.check_box :enable %> > > <%= builder.label :enable, role.name (http://role.name) %> > > > > <% end %> > > > > <%= f.submit %> > > > > <% end %> > > > > Under rails 3.2.11 I get a form that allows the user to edit roles. > > Editing controller_action > > Name > > Roles > > Webmaster > > Admin > > Moderator > > Editor > > Registered User > > Guest > > > > > > > > Show (http://localhost:3200/controller_actions/1) | Back > > (http://localhost:3200/controller_actions) > > > > Under Rails 4.0 you get:- > > undefined method `role' for #<Array:0xb875d4c> > > Extracted source (around line #21): > > > > 18 19 20 21 22 23 24 > > > > <div> > > <h2><%= f.label :role %></h2> > > <%= f.fields_for :interactions, > > @controller_action.initialized_interactions() do |builder| %> > > <% role = builder.object.role %> > > <%= builder.hidden_field :role_id %> > > > > <div class="field"> > > > > > > > > > > > > > > > > Trace of template inclusion: app/views/controller_actions/edit.html.erb > > Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2 > > Application Trace (http://localhost:3100/controller_actions/1/edit#) | > > Framework Trace (http://localhost:3100/controller_actions/1/edit#) | Full > > Trace (http://localhost:3100/controller_actions/1/edit#) > > app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in > > _app_views_controller_actions__form_html_erb__366592963_95670400' > > actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in > > `block in capture' actionpack (4.0.0.beta1) > > lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer' > > actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in > > `capture' actionpack (4.0.0.beta1) > > lib/action_view/helpers/form_helper.rb:707:in `fields_for' actionpack > > (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in `fields_for' > > app/views/controller_actions/_form.html.erb:20:in `block in > > _app_views_controller_actions__form_html_erb__366592963_95670400' > > actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in > > `block in capture' actionpack (4.0.0.beta1) > > lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer' > > actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in > > `capture' actionpack (4.0.0.beta 1) lib/action_view/helpers/form_helper.rb:435:in `form_for' app/views/controller_actions/_form.html.erb:1:in `_app_views_controller_actions__form_html_erb__366592963_95670400' actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in render' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in `instrument' actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in `render' actionpack (4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:306:in `render_partial' actionpack (4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:279:in `block in render' actionpack (4.0.0.beta1) lib/action_view/renderer/abstract_renderer.rb:23:in `block in instrument' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `block in instrument' activesupport (4.0.0.beta1) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `instrument' actionpack (4.0.0.beta1) lib/a ction_view/renderer/abstract_renderer.rb:23:in `instrument' actionpack (4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:278:in `render' actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:41:in `render_partial' actionpack (4.0.0.beta1) lib/action_view/helpers/rendering_helper.rb:27:in `render' app/views/controller_actions/edit.html.erb:3:in `_app_views_controller_actions_edit_html_erb__785330494_92185850' actionpack (4.0.0.beta1) lib/action_view/template.rb:143:in `block in render' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in `instrument' actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in `render' actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in render_template' actionpack (4.0.0.beta1) lib/action_view/renderer/abstract_renderer.rb:23:in `block in instrument' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `block in instrument' activesupport (4.0.0.beta1) lib /active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `instrument' actionpack (4.0.0.beta1) lib/action_view/renderer/abstract_renderer.rb:23:in `instrument' actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:48:in `block in render_template' actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:56:in `render_with_layout' actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:47:in `render_template' actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:17:in `render' actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:36:in `render_template' actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:17:in `render' actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:119:in `_render_template' actionpack (4.0.0.beta1) lib/action_controller/metal/streaming.rb:219:in `_render_template' actionpack (4.0.0.beta1) lib/abst ract_controller/rendering.rb:112:in `render_to_body' actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:33:in `render_to_body' actionpack (4.0.0.beta1) lib/action_controller/metal/renderers.rb:26:in `render_to_body' actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:97:in `render' actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:16:in `render' actionpack (4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render' activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' /home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in `realtime' activesupport (4.0.0.beta1) lib/active_support/core_ext/benchmark.rb:5:in `ms' actionpack (4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:41:in `block in render' actionpack (4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime' activerecord (4.0.0.beta1) lib/active_record/railties/c ontroller_runtime.rb:24:in `cleanup_view_runtime' actionpack (4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:40:in `render' actionpack (4.0.0.beta1) lib/action_controller/metal/implicit_render.rb:10:in `default_render' actionpack (4.0.0.beta1) lib/action_controller/metal/implicit_render.rb:5:in `send_action' actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:189:in `process_action' actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in `process_action' actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:18:in `block in process_action' activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:413:in `_run__68927184__process_action__callbacks' activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in `run_callbacks' actionpack (4.0.0.beta1) lib/abstract_controller/callbacks.rb:17:in `process_action' actionpack (4.0.0.beta1) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (4.0.0.beta1) lib/action_controller/ metal/instrumentation.rb:31:in `block in process_action' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `block in instrument' activesupport (4.0.0.beta1) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `instrument' actionpack (4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:30:in 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lib/action_dispatch/journey/router.rb:57:in `each' actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:651:in `call' rack (1.5.2) lib/rack/etag.rb:23:in `call' rack (1.5.2) lib/rack/conditionalget.rb:25:in `call' rack (1.5.2) lib/rack/head.rb:11:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/params_parser.rb:27:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/flash.rb:241:in `call' rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context' rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call ' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/cookies.rb:452:in `call' activerecord (4.0.0.beta1) lib/active_record/query_cache.rb:36:in `call' activerecord (4.0.0.beta1) lib/active_record/connection_adapters/abstract/connection_pool.rb:632:in `call' activerecord (4.0.0.beta1) lib/active_record/migration.rb:348:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:373:in `_run__125207171__call__callbacks' activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in `run_callbacks' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/reloader.rb:64:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middlewar e/show_exceptions.rb:30:in `call' railties (4.0.0.beta1) lib/rails/rack/logger.rb:38:in `call_app' railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `block in call' activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in `block in tagged' activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:25:in `tagged' activesupport (4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in `tagged' railties (4.0.0.beta1) lib/rails/rack/logger.rb:21:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' rack (1.5.2) lib/rack/runtime.rb:17:in `call' activesupport (4.0.0.beta1) lib/active_support/cache/strategy/local_cache.rb:72:in `call' rack (1.5.2) lib/rack/lock.rb:17:in `call' actionpack (4.0.0.beta1) lib/action_dispatch/middleware/static.rb:64:in `call' railties (4.0.0.beta1) lib/rails/engine.rb:510:in `call' railties (4.0.0.beta1) lib/rails/application.rb:96:in `call' railtie s (4.0.0.beta1) lib/rails/railtie/configurable.rb:30:in `method_missing' unicorn (4.6.2) lib/unicorn/http_server.rb:552:in `process_client' unicorn (4.6.2) lib/unicorn/http_server.rb:632:in `worker_loop' unicorn (4.6.2) lib/unicorn/http_server.rb:500:in `spawn_missing_workers' unicorn (4.6.2) lib/unicorn/http_server.rb:511:in `maintain_worker_count' unicorn (4.6.2) lib/unicorn/http_server.rb:277:in `join' unicorn (4.6.2) bin/unicorn_rails:209:in `<top (required)>' /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `load' /home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top (required)>' ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in `debug_load' ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in `debug_program' ruby-debug-ide (0.4.17.beta16) bin/rdebug-ide:109:in `<top (required)>' -e:1:in `load' -e:1:in `<main>' > > > > > > Request > > Parameters: > > {"id"=>"1"} > > Toggle session dump (http://localhost:3100/controller_actions/1/edit#) > > > > Toggle env dump (http://localhost:3100/controller_actions/1/edit#) > > > > Response > > Headers: > > None > > > > Sorry about the verbosity but I am really struggling to solve this most > > basic use case. > > > > I have tried to figure out why the form builder returns an array but and > > would write my own if I could figure out how to. > > > > Any help appreciated. > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rubyonrails-talk+unsubscr...@googlegroups.com > (mailto:rubyonrails-talk+unsubscr...@googlegroups.com). > To post to this group, send email to rubyonrails-talk@googlegroups.com > (mailto:rubyonrails-talk@googlegroups.com). > To view this discussion on the web visit > https://groups.google.com/d/msg/rubyonrails-talk/-/lyjS-Uad5VwJ. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. 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