Rails Generate Scaffold Foreign Key

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Adds a new foreign key. Fromtable is the table with the key column, totable contains the referenced primary key. The foreign key will be named after the following pattern: fkrails. Identifier is a 10 character long string which is deterministically generated from the fromtable and column. For example, by declaring that one model belongsto another, you instruct Rails to maintain Primary Key - Foreign Key information between instances of the two models, and you also get a number of utility methods added to your model. In the remainder of this guide, you'll learn how to declare and use the various forms of associations. When you generate models like this: rails generate model anothermodel:references, it will generate an anothermodelid field in migration and index for this field which is usually enough. No foreign keys constraints are needed in your database. Feb 24, 2020 Please refer to the Rails Command Line Docs for more information. Command Line Generator Info Reference. You can get all of this information on the command line. Rails generate with no generator name will output a list of all available generators and some information about global options.

Rails' use of strict naming conventions means a lot of core code SHOULD be in the same format whoever writes it? It could be written by a friend, colleague or a computer.. it shouldn't matter because the same Rails rules apply to everyone.

This means that Rails can actually do some tasks for you!It can actually build things and write code on your behalf..

Coming from another language like PHP, this can seem like magic.

Quick reference:

##Rails generatorThe rails generate command uses templates designed-by-convention to create a whole lot of useful things. Running rails generate by itself gives a list of available generators:

or for super-hackers:

There are a lot of generators:

Rails:

  • assets
  • controller
  • generator
  • helper
  • integration_test
  • mailer
  • migration
  • model
  • observer
  • performance_test
  • resource
  • scaffold
  • scaffold_controller
  • session_migration
  • task

Coffee:

  • coffee:assets

Jquery:

  • jquery:install

Js:

  • js:assets

##Scaffolding in Rails

Rails' scaffolding tool is a quick way to generate some of the major pieces of code in an application. This saves a lot of time when you want to get up-and-running quickly! (It is super cool!)

Depending on what you want to create, scaffolding can auto-generate all or a combination of:

There might be a few more files that it makes.. I'm not sure if that's a complete list!

##Scaffolding a whole resource

You are scaffolding things associated with an object (singular)

If you want to scaffold an application, you need to scaffold each resource within that application. If you wanted to make a blogging application for example - you could scaffold the whole Post resource:

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Rails Generate Model With Foreign Key

The resource name Post needs to be:

  • UpperCamelCase
  • SINGULAR

This name is going to be the name of the model, e.g. Post. It is also going to be the name of the controller class (but pluralized), e.g. PostsController AND the name of the table (but pluralized) e.g. posts

After the class name, you can add table columns and their datatypes.

These table columns names should be:

  • lower_snake_case
  • SINGULAR

This is because each Post item is meant to have one value stored in each column.

If you ran this scaffold, it would create these all files:

  • db/migrate/20100207214725_create_posts.rb
  • app/models/post.rb
  • test/unit/post_test.rb
  • test/fixtures/posts.yml
  • config/routes.rb
  • app/controllers/posts_controller.rb
  • app/views/posts/index.html.erb
  • app/views/posts/edit.html.erb
  • app/views/posts/show.html.erb
  • app/views/posts/new.html.erb
  • app/views/posts/_form.html.erb
  • test/functional/posts_controller_test.rb
  • app/helpers/posts_helper.rb
  • test/unit/helpers/posts_helper_test.rb
  • app/assets/javascripts/posts.js.coffee
  • app/assets/stylesheets/posts.css.scss
  • app/assets/stylesheets/scaffolds.css.scss

Within the PostController, all of the RESTful methods will be created and they will all have their corresponding view files.

After creating the migration file, in order to make the change to the database remember to run:

##Generating just a controller

It controls lots of objects (so it is plural)

Rails Generate Scaffold Foreign Keys

Sometimes, you want to generate just a controller.

The controller name needs to be:

  • UpperCamelCase
  • PLURALIZED

This is because a controller deals with lots of examples of an object, so it should be plural.

This will make these files:

  • app/controllers/comments_controller.rb
  • app/views/comments/
  • test/controllers/comments_controller_test.rb
  • app/helpers/comments_helper.rb
  • test/helpers/comments_helper_test.rb
  • app/assets/javascripts/comment.js.coffee
  • app/assets/stylesheets/comment.css.scss

This will NOT create a migration file or a model file.

Rails Generate Scaffold Foreign Key Code

##Generating just a model

You are generating the outline of an object (singular)

If you just want to create a model, you can do:

  • UpperCamelCase
  • SINGULAR

You can also add the column names to this if you want:

These table column names should be:

  • lower_snake_case
  • SINGULAR

Generating a model will create these files:

  • db/migrate/20140120201010_create_comments.rb
  • app/models/comment.rb
  • test/models/comment_test.rb
  • test/fixtures/comments.yml

Rails Scaffold With Foreign Key

After creating the migration file, in order to make the change to the database remember to run: