Hobo Hobo → Hobo 1.0X

(Hobo 1.0.2, ruby 1.8.7) and (Hobo 1.3.0pre25, ruby 1.9.2p0)

When Hobo evaluates ":available_to" expressions, it doesn't set model.acting_user. Because of this, "Tutorial 23 - Using Hobo Lifecycles for Workflow" example on page 273 of the "Rapid Rails with Hobo" book fails with "NoMethodError: undefined method `sign_up?' for nil:NilClass".

# app/models/recipe.rb:

class Recipe < ActiveRecord::Base
  hobo_model # Don't put anything above this

  fields do
    title :string
    timestamps
  end

  def log_backtrace
    logger.warn("@@ acting_user (shouldn't be nil) = #{acting_user.inspect}\n")
    logger.warn("  #{caller[0, 15].join("\n  ")}\n")
  end

  lifecycle :state_field => :lifecycle_state do
    state :not_published, :default => true
    state :published
    transition :publish, { :not_published => :published }, :available_to => "log_backtrace; ::User"
    # transition :publish, { :not_published => :published }, :available_to => "acting_user if acting_user.signed_up?"
  end

  def create_permitted?; true; end
  def update_permitted?; true; end
  def destroy_permitted?; true; end
  def view_permitted?(field); true; end
end

# app/controllers/recipes_controller.rb:

class RecipesController < ApplicationController
  hobo_model_controller
  auto_actions :all
end

# app/views/recipes/index.dryml:

<index-page>
  <collection: replace>
    <div>
      <table-plus fields="id, lifecycle_state, title">
        <controls:>
          <transition-buttons/>
        </controls:>
      </table-plus>
    </div>
  </collection:>
</index-page>

# and create a record

>> Recipe.create!(:title => "The Golden Recipe")
=> #<Recipe id: 1, title: "The Golden Recipe", created_at: "2011-01-15 05:50:59", updated_at: "2011-01-15 05:50:59", lifecycle_state: "not_published", key_timestamp: nil>
>> Recipe.count
=> 1

Visiting /recipes, you'll get these traces:

Started GET "/recipes" for 127.0.0.1 at 2011-01-15 15:31:59 +0900
  SQL (0.3ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'
  SQL (0.2ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'

  Processing by RecipesController#index as HTML
  User Load (0.5ms)  SELECT "users".* FROM "users" WHERE ("users"."id" = 1) LIMIT 1
  Recipe Load (0.2ms)  SELECT "recipes".* FROM "recipes" LIMIT 30 OFFSET 0
  User Load (1.0ms)  SELECT "users".* FROM "users" LIMIT 30
@@ acting_user (shouldn't be nil) = #<User id: 1, crypted_password: "6c01a8cb611aa67b6ff041fbbfa1a8a7476ec14d", salt: "79ab038b611910fc6c6c5b331aef7f3d1346d001", remember_token: nil, remember_token_expires_at: nil, name: "Tomoaki Hayasaka", email_address: "hayasaka@example.com", administrator: true, created_at: "2011-01-15 06:18:35", updated_at: "2011-01-15 06:18:35", state: "active", key_timestamp: nil>
  (eval):1:in `__top_level_eval__'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:5:in `instance_eval'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:5:in `__top_level_eval__'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:61:in `run_hook'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:40:in `publishable_by'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:53:in `acting_user_is?'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:15:in `available_to_acting_user?'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:103:in `can_run?'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:147:in `block (2 levels) in available_transitions_for'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:147:in `select'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:147:in `block in available_transitions_for'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/permissions.rb:168:in `with_acting_user'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:146:in `available_transitions_for'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:152:in `publishable_transitions_for'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/rapid/taglibs/rapid_lifecycles.dryml:55:in `block (2 levels) in transition_buttons'
@@ acting_user (shouldn't be nil) = nil
  (eval):1:in `__top_level_eval__'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:5:in `instance_eval'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:5:in `__top_level_eval__'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:61:in `run_hook'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/actions.rb:40:in `publishable_by'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:152:in `block in publishable_transitions_for'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:152:in `select'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/model/lifecycles/lifecycle.rb:152:in `publishable_transitions_for'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/rapid/taglibs/rapid_lifecycles.dryml:55:in `block (2 levels) in transition_buttons'
  /var/lib/gems/1.9.1/gems/dryml-1.3.0.pre25/lib/dryml/template_environment.rb:247:in `block in new_context'
  /var/lib/gems/1.9.1/gems/actionpack-3.0.3/lib/action_view/helpers/capture_helper.rb:172:in `with_output_buffer'
  /var/lib/gems/1.9.1/gems/dryml-1.3.0.pre25/lib/dryml/template_environment.rb:247:in `new_context'
  /var/lib/gems/1.9.1/gems/hobo-1.3.0.pre25/lib/hobo/rapid/taglibs/rapid_lifecycles.dryml:54:in `block in transition_buttons'
  /var/lib/gems/1.9.1/gems/dryml-1.3.0.pre25/lib/dryml/template_environment.rb:327:in `block in _tag_context'
  /var/lib/gems/1.9.1/gems/dryml-1.3.0.pre25/lib/dryml/template_environment.rb:247:in `block in new_context'
Rendered recipes/index.dryml (347.3ms)
Completed 200 OK in 356ms (Views: 347.7ms | ActiveRecord: 2.2ms)

Note that the ":available_to" expression is evaluated twice for one record, and on second time acting_user is nil.