Question

我有一个现有的模型＆＃39; micropost＆＃39;我发现该模型有更好的名称以适合我的应用。重命名微博＆＃39;更好的方法是什么？模特到故事＆＃39;模型而不影响其指数？我正在使用Rails 5.0.0.rc1。迁移代码段为：

class CreateMicroposts < ActiveRecord::Migration
  def change
    create_table :microposts do |t|
     t.text :content
     t.references :user, index: true

     t.timestamps null: false
    end
    add_index :microposts, [:user_id, :created_at]
 end
end

Answer 1

1.进行迁移以将数据库表名从微博改为故事。

CSensoryFrame SF;

CActionCollection actionCol;

CPose2D actualOdometryReading(0.0f, 0.0f, DEG2RAD(.0f));

// Prepare the &quot;options&quot; structure:
CActionRobotMovement2D                      actMov;
CActionRobotMovement2D::TMotionModelOptions opts;

opts.modelSelection = CActionRobotMovement2D::mmThrun;
opts.thrunModel.alfa3_trans_trans = 0.10f;

// Create the probability density distribution (PDF) from a 2D odometry reading:
actMov.computeFromOdometry(actualOdometryReading, opts);

actionCol.insert(actMov);

CObservation2DRangeScanPtr myObs = CObservation2DRangeScan::Create();


myObs->scan = scan; // = [1,0]
myObs->validRange = vranges; // = [1,1]
myObs->aperture = 2 * M_PI;


SF.insert(myObs);

2.手动将Active Record模型类更改为Story

Answer 2

在控制台上运行命令：

$ rails g migration RenameMicropostToStory

修改迁移文件：

class RenameMicropostToStory < ActiveRecord::Migration

  def change
    rename_table :microposts, :stories
  end

end

然后，

$ rake db：migrate

使用迁移重命名模型

2 个答案: