Rails 4複製模型對象和合並新對象屬性（Amoeba Gem）

Question

我在做什麼：複製項目模型的記錄，然後覆蓋窗體提交的對象的修改後的屬性。新記錄應該被修改，但所有的關聯都是原始的。

我採取的第一步是複製一個AR模型對象，包括其關聯，我正在與Amoeba寶石做。

projects_controller.rb

... 
def create 
    if params[:copy] 
     orig_project = Project.find params[:copy] 
     @new_project = orig_project.amoeba_dup 
... 

現在，我想我的project_params合併到@new_project對象覆蓋屬性，這個屬性是不同的。

projects_controller.rb

... 
def create 
    if params[:copy] 
     orig_project = Project.find params[:copy] 
     @new_project = orig_project.amoeba_dup 

     my_merge_method(@new_project,project_params) 
... 
     if @new_project.save 

任何人都可以提供一個很好的方式與一些軌道魔法來做到這一點？謝謝

Answer 1

亂七八糟的軌道控制檯我發現AR模型對象的方法update_attributes做我想要的。

對於實例

new_project = orig_project.amoeba_dup 
new_project.update_attributes(project_params) 

...將離開聯想完好，但覆蓋new_project與project_params

這裏是軌道控制檯輸出來證明這一點。

35: def create 
    36: if params[:copy] 
    37:  orig_project = Project.find params[:copy] 
    38:  @project = orig_project.amoeba_dup 
    39: 
=> 40:  binding.pry 
    41: else 
    42:  @project = Project.new(project_params) 
    43: end 
    44: 
    45: respond_to do |format| 
    46:  if @project.save 
    47:  format.html { redirect_to @project, notice: 'Project was successfully created.' } 
    48:  format.json { render action: 'show', status: :created, location: @project } 
    49:  else 
    50:  format.html { render action: 'new' } 
    51:  format.json { render json: @project.errors, status: :unprocessable_entity } 
    52:  end 
    53: end 
    54: end 

[1] pry(#<ProjectsController>)> params[:copy] 
=> "201" 
[2] pry(#<ProjectsController>)> @project 
=> #<Project:0x00000005c38e58 
id: nil, 
name: "Corn Flour Milling with Setup", 
scheduled_start_date: Tue, 29 Dec 2015, 
estimated_end_date: Wed, 27 Jan 2016, 
employees_needed: 2, 
incoming_packaging: "Boxes", 
final_product_packaging: "Boxes", 
sample_instructions: "One 18 oz every pallet.\r\nMilled Corn Flour\r\nLot Number\r\nBag Number\r\nNet Weight", 
project_description: "Mill the piss out of this.", 
project_type: "Production", 
building_id: "5", 
paid_status: false, 
material_total_weight_lbs: 40000, 
shifts: 1.0, 
shift_hrs: 8, 
rate_lb_hr: 2000, 
company_id: 1, 
created_at: nil, 
updated_at: nil> 
[4] pry(#<ProjectsController>)> @project.setups 
=> [#<Setup:0x00000005cid: 22, created_at: Thu, 21 Jan 2016 14:33:09 UTC +00:00, updated_at: Thu, 21 Jan 2016 14:33:09 UTC +00:00>] 
[5] pry(#<ProjectsController>)> project_params 
=> {"name"=>"Corn Flour Milling with Setup", 
"scheduled_start_date"=>"2016-03-25", #changed this value 
"estimated_end_date"=>"2016-03-30", #changed this value 
"employees_needed"=>"2", 
"incoming_packaging"=>"Boxes", 
"final_product_packaging"=>"Boxes", 
"sample_instructions"=>"One 18 oz every pallet.\r\nMilled Corn Flour\r\nLot Number\r\nBag Number\r\nNet Weight", 
"project_description"=>"Mill the piss out of this.", 
"project_type"=>"Production", 
"building_id"=>"5", 
"paid_status"=>"false", 
"material_total_weight_lbs"=>"40000", 
"shifts"=>"1.0", 
"shift_hrs"=>"8", 
"rate_lb_hr"=>"2000", 
"company_id"=>"1"} 
[7] pry(#<ProjectsController>)> @project.update_attributes(project_params) 
    (0.6ms) BEGIN 
    Company Load (1.3ms) SELECT "companies".* FROM "companies" WHERE "companies"."id" = $1 LIMIT 1 [["id", 1]] 
    SQL (1.3ms) INSERT INTO "projects" ("name", "scheduled_start_date", "estimated_end_date", "employees_needed", "incoming_packaging", "final_product_packaging", "sample_instructions", "project_description", "project_type", "building_id", "paid_status", "material_total_weight_lbs", "shifts", "shift_hrs", "rate_lb_hr", "company_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18) RETURNING "id" [["name", "Corn Flour Milling with Setup"], ["scheduled_start_date", "2016-03-25"], ["estimated_end_date", "2016-03-30"], ["employees_needed", 2], ["incoming_packaging", "Boxes"], ["final_product_packaging", "Boxes"], ["sample_instructions", "One 18 oz every pallet.\r\nMilled Corn Flour\r\nLot Number\r\nBag Number\r\nNet Weight"], ["project_description", "Mill the piss out of this."], ["project_type", "Production"], ["building_id", "5"], ["paid_status", "f"], ["material_total_weight_lbs", 40000], ["shifts", 1.0], ["shift_hrs", 8], ["rate_lb_hr", 2000], ["company_id", 1], ["created_at", "2016-01-21 20:07:26.508713"], ["updated_at", "2016-01-21 20:07:26.508713"]] 
    SQL (1.8ms) INSERT INTO "projects_setups" ("setup_id", "project_id") VALUES ($1, $2) [["setup_id", 22], ["project_id", 217]] 
    (32.1ms) COMMIT 
=> true 
[8] pry(#<ProjectsController>)>