如何将时间戳插入到 rails 数据库列中 [英] How to insert timestamp into rails database-column

问题描述

我刚开始使用 RoR，有一个问题:如何将当前时间戳(或任何类型的时间)插入模型中?下面你会看到日志函数创建.

I just started with RoR and have a question: How can I insert the current timestamp (or any type of time) into the model? Below you see the log function create.

def create
    @log = Log.new(params[:log])

    respond_to do |format|
      if @log.save
        format.html { redirect_to @log, notice: 'Log was successfully created.' }
        format.json { render json: @log, status: :created, location: @log }
      else
        format.html { render action: "new" }
        format.json { render json: @log.errors, status: :unprocessable_entity }
      end
    end
  end

推荐答案

Rails 模型生成器自动创建 created_at 和 updated_at datetime 字段数据库给你.这些字段会在分别创建或更新记录时自动更新.

The Rails model generator automatically creates created_at and updated_at datetime fields in the database for you. These fields are automatically updated when a record is created or updated respectively.

如果您想手动创建时间戳，请将日期时间列(例如 timestamp_field)添加到数据库并在模型中使用 before_save 回调.

If you want to manually create a timestamp, add a datetime column (e.g. timestamp_field) to the database and use a before_save callback in your model.

class Log < ActiveRecord::Base
  before_save :generate_timestamp

  def generate_timestamp
    self.timestamp_field = DateTime.now
  end
end

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