Update cheatsheets

rails-generate

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rails generate
+
+> Generate new Rails templates in an existing project.
+> More information: <https://guides.rubyonrails.org/command_line.html#bin-rails-generate>.
+
+- List all available generators:
+
+`rails generate`
+
+- Generate a new model named Post with attributes title and body:
+
+`rails generate model {{Post}} {{title:string}} {{body:text}}`
+
+- Generate a new controller named Posts with actions index, show, new and create:
+
+`rails generate controller {{Posts}} {{index}} {{show}} {{new}} {{create}}`
+
+- Generate a new migration that adds a category attribute to an existing model called Post:
+
+`rails generate migration {{AddCategoryToPost}} {{category:string}}`
+
+- Generate a scaffold for a model named Post, predefining the attributes title and body:
+
+`rails generate scaffold {{Post}} {{title:string}} {{body:text}}`