has_and_belongs_to_many問題上的Rails功能測試問題

Question

我對Ruby和rails比較陌生，並且在一個我無法理解的問題上陷入困境。我有兩個模型PricingRuleType和PricingRule，它們的設置如下所示。

class PricingRuleType < ActiveRecord::Base 
    attr_accessible :type_of_rule 
    has_and_belongs_to_many :product_rules 
    validates :type_of_rule, :presence => true 
end 

class ProductRule < ActiveRecord::Base 
    has_and_belongs_to_many :pricing_rule_types 
    validates :pricing_rule_type, :discount_per_unit, :number_of_units, :presence => true 
    validates :discount_per_unit, :numericality => {:greater_than_or_equal_to => 0.01} 
end 

用於功能測試的創建和更新方法如下所示：

1) Error: 
test_should_create_product_rule(ProductRulesControllerTest): 
NoMethodError: undefined method `stringify_keys' for "revoo_rule":String 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/attribute_assignment.rb:69:in `assign_attributes' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/base.rb:495:in `initialize' 
    /Users/kushaldsouza/Documents/Client Projects/Revoo/app/controllers/product_rules_controller.rb:44:in `new' 
    /Users/kushaldsouza/Documents/Client Projects/Revoo/app/controllers/product_rules_controller.rb:44:in `create' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/base.rb:167:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/rendering.rb:10:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:414:in `_run__580034481047679801__process_action__1008436725406406543__callbacks' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:405:in `__run_callback' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:81:in `run_callbacks' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/callbacks.rb:17:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/rescue.rb:29:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/notifications.rb:123:in `block in instrument' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/notifications.rb:123:in `instrument' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/params_wrapper.rb:205:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/base.rb:121:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/rendering.rb:45:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/testing.rb:17:in `process_with_new_base_test' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/test_case.rb:464:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/test_case.rb:49:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/test_case.rb:385:in `post' 
    /Users/kushaldsouza/Documents/Client Projects/Revoo/test/functional/product_rules_controller_test.rb:27:in `block (2 levels) in <class:ProductRulesControllerTest>' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/testing/assertions.rb:55:in `assert_difference' 
    /Users/kushaldsouza/Documents/Client Projects/Revoo/test/functional/product_rules_controller_test.rb:26:in `block in <class:ProductRulesControllerTest>' 



2) Error: 
test_should_update_product_rule(ProductRulesControllerTest): 
NoMethodError: undefined method `each' for "1":String 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/associations/collection_association.rb:308:in `replace' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/associations/collection_association.rb:41:in `writer' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/associations/builder/association.rb:51:in `block in define_writers' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/attribute_assignment.rb:85:in `block in assign_attributes' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/attribute_assignment.rb:78:in `each' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/attribute_assignment.rb:78:in `assign_attributes' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/persistence.rb:212:in `block in update_attributes' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/database_statements.rb:190:in `transaction' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/transactions.rb:208:in `transaction' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/transactions.rb:293:in `with_transaction_returning_status' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/persistence.rb:211:in `update_attributes' 
    /Users/kushaldsouza/Documents/Client Projects/Revoo/app/controllers/product_rules_controller.rb:63:in `block in update' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/mime_responds.rb:269:in `call' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/mime_responds.rb:269:in `retrieve_response_from_mimes' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/mime_responds.rb:194:in `respond_to' 
    /Users/kushaldsouza/Documents/Client Projects/Revoo/app/controllers/product_rules_controller.rb:62:in `update' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/base.rb:167:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/rendering.rb:10:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:414:in `_run__580034481047679801__process_action__1983642789249364420__callbacks' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:405:in `__run_callback' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:81:in `run_callbacks' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/callbacks.rb:17:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/rescue.rb:29:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/notifications.rb:123:in `block in instrument' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.2.1/lib/active_support/notifications.rb:123:in `instrument' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/params_wrapper.rb:205:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/base.rb:121:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/abstract_controller/rendering.rb:45:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/metal/testing.rb:17:in `process_with_new_base_test' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/test_case.rb:464:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/test_case.rb:49:in `process' 
    /Users/kushaldsouza/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.1/lib/action_controller/test_case.rb:390:in `put' 
    /Users/kushaldsouza/Documents/Client Projects/Revoo/test/functional/product_rules_controller_test.rb:44:in `block in <class:ProductRulesControllerTest>' 

我的測試控制器如下所示：

require 'test_helper' 

class ProductRulesControllerTest < ActionController::TestCase 
    fixtures :product_rules 
    setup do 
    @product_rule = product_rules(:one) 
    @update = { 
     :number_of_units => 3, 
     :discount_per_unit => 2.3, 
     :pricing_rule_type => pricing_rule_types(:revoo_pricing_rule) 
    } 
    end 

    test "should get index" do 
    get :index 
    assert_response :success 
    assert_not_nil assigns(:product_rules) 
    end 

    test "should get new" do 
    get :new 
    assert_response :success 
    end 

    test "should create product_rule" do 
    assert_difference('ProductRule.count') do 
     post :create, :product_rule => :revoo_rule 
    end 

    assert_redirected_to product_rule_path(assigns(:product_rule)) 
    end 

    test "should show product_rule" do 
    get :show, id: @product_rule 
    assert_response :success 
    end 

    test "should get edit" do 
    get :edit, id: @product_rule 
    assert_response :success 
    end 

    test "should update product_rule" do 
    put :update, id: @product_rule.to_param, :product_rule => @update 
    assert_redirected_to product_rule_path(assigns(:product_rule)) 
    end 

    test "should destroy product_rule" do 
    assert_difference('ProductRule.count', -1) do 
     delete :destroy, id: @product_rule 
    end 

    assert_redirected_to product_rules_path 
    end 
end 

我不完全知道爲什麼就是我得到這個錯誤並且一直困住它。出於任何原因，這可能是由於我已經包含has_and_belongs_to_many關係。我有其他的模型與上述兩個類似的方式建立，但沒有這種關係，他們似乎沒有任何錯誤。任何幫助，非常感謝。

Answer 1

在測試「應該創建product_rule」什麼是：revoo_rule？ 它應該是：

post :create, :product_rule => @product_rule.to_param 

而且在測試 「應該更新product_rule」 你有：product_rule => @Update 在安裝它應該被定義爲：

:pricing_rule_type_ids => pricing_rule_types(:revoo_pricing_rule).id