scaffold

Not sure if I'm reading this right, but it seems like Scaffold will not do a one-to-many relationship in its entirety. For instance, if I create messages with scaffold and then I want comments on those messages (one message -> many comments ), I have to go through and change everything. For instance, I have to change this in the comment 's new view <% form_for(@comment) do |f| %> to this <% form_for([@message, @comment]) do |f| %> and then change the Action to set up the @message var... amongst other things. This cannot currently be done automatically with Scaffold, right? This is true, but,

Is there a way to generate a scaffold in rails 3.0 so that scaffold.css does NOT get created? Something at the command line I can enter to skip that step? Thanks There is a --no-stylesheets flag you can use: rails g scaffold MyModel --no-stylesheets You can also disable it by default -- in config/application.rb : config.generators do |g| g.stylesheets false end Rails itself only uses it for scaffold.css AFAIK, but unfortunately the same hook could be used by other generators, so you might need to remember to pass --stylesheets for a third-party gem that generates assets, for instance. It'd be

I'm working through the Hartl ruby on rails tutorial (section 2.2), and I'm having trouble migrating the database. Everything seemed to be working, and then I ran rails generate scaffold User name:string email:string Afterwards I tried to run bundle exec rake db:migrate and got the below error message: $ bundle exec rake db:migrate == 20141125234257 CreateUsers: migrating ====================================== -- create_table(:users) -> 0.0079s == 20141125234257 CreateUsers: migrated (0.0080s) ============================= rake aborted! StandardError: An error has occurred, this and all later

在 Flutter 中，ListView 可以沿一个方向（垂直或水平方向）来排列其所有子 Widget，常被用于需要展示一组连续视图元素的场景 ListView 构造方法 ListView：仅适用于列表中含有少量元素的场景 ListView.build：适用于子 Widget 比较多的场景 ListView.separated：适用于需要设置分割线的场景 构造方法名 特点 使用场景 ListView 一次性创建好所有子 Widget 适用于展示少量连续子 Widget 的场景 ListView.build 提供了子 Widget 创建方法，仅在需要展示时才创建 适用于子 Widget 较多，且视觉效果呈现某种规律性的场景 ListView.separated 提供了子 Widget 创建方法，仅在需要展示时才创建，且提供了自定义分割线的功能 适用于子 Widget 较多，且视觉效果呈现某种规律性、每个子 Widget 之间需要分割线的场景 ListView 可以通过设置 children 参数，将所有子 Widget 包含到 listView 中，但这种创建方法要求提前将所有子 Widget 一次性创建好，而不是等到真正需要在屏幕上显示时才创建，即这种方法是导致性能下降。因此，这种方式只适合列表中含有少量元素的场景 class List extends