database - 我如何在 ruby​​ on rails 中编写插入语句？

Question

我在 ruby​​ on rails 上运行插入语句。但是失败了。这是代码:

class BookmarkController < ApplicationController
  def index

    if request.post?
    @user_new = Bookmark.new(params[:user_new])
    tags = @user_new.tags.split(",")
    @user_new = Bookmark.new(params[:user_new])
    query = "INSERT INTO bookmark (title , url, tags) VALUES (#{@user_new.title}, #{@user_new.url}, #{tags[0]})  "

    Bookmark.connection.execute(query);

    end   

  end

但是输出是:

ActiveRecord::StatementInvalid in BookmarkController#index

SQLite3::SQLException: near ".": syntax error: INSERT INTO bookmark (title , url, tags) VALUES (abhir, www.mrabhiram.tumblr.com, tumblr)  

谁能建议我使用 SQL 插入语句插入记录的正确方法？

Answer 1

假设 Bookmark 是 ActiveRecord 的子类，AR 会为您保存它 - 无需编写自定义 SQL - save 方法将采用关心这个。您可以阅读有关 ActiveRecord 功能的更多信息 here

class BookmarkController < ApplicationController
  def index

    if request.post?
    @user_new = Bookmark.new(params[:user_new])
    tags = @user_new.tags.split(",")
    @user_new = Bookmark.new(params[:user_new])
    #query = "INSERT INTO bookmark (title , url, tags) VALUES (#{@user_new.title}, #{@user_new.url}, #{tags[0]})  "

    #Bookmark.connection.execute(query);
    # The save method will insert the record into the database.
    @user_new.save()    

    end   

  end