Ruby on Rails Tutorial chapter II Weibo resources

1. The microblog model is as follows:

2, the creation of Weibo resources, the command is as follows:

$ rails Generate scaffold micropost content:text User_id:integer #生成微博资源

$ bundle EXEC Rake db:migrate #执行迁移, update the database, use the new data model

3, the content of micro-blog restrictions

(1) Limit the length of Weibo

In the APP/MODELS/MICROPOST.RB

class Micropost <activerecord::base validates:content, length:{maximum: }end

(2) Weibo cannot be empty

class Micropost <activerecord::base validates:content, length:{maximum: presence:trueend

4, a user has a number of micro-blog

In APP/MODELS/USER.RB

class User <activerecord::base Has_many:micropostsend

In APP/MODELS/MICROPOST.RB

class Micropost <activerecord::base Belongs_to:user validates:content, length:{maximum: }end

Verifying the relationship between user and Micropost

$ rails Console>> first_user = user.first>> first_user.microposts>> Micropost = First_user.microposts.first>> micropost.user>> exit

5. The inheritance relationships in Userscontroller and Micropostscontroller are as follows:

6. Deploy the Application

-"Finish toy app"$ git push$ git push heroku$ heroku run rake db:migrate

Ruby on Rails Tutorial chapter II Weibo resources