Mar 28, 2017 Final notes: Migrating an app to rails is much more challenging than the example mentioned in this tutorial. Indeed, you will be asked to perform a lot of changes on the existing db structure depending on the gems that cover your app features. May 14, 2016 Here, a foreign key of 1 in the categoryid column will relate to food expenses, a foreign key of 2 will relate to accommodation expenses, and so forth. Let's dive in. Generate Models. To start off, I created a new rails application and established the primary database, expenses.
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Sign upRails Generate Model Primary Key 2017
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# frozen_string_literal: true |
require'rails/generators/active_record' |
moduleActiveRecord |
moduleGenerators# :nodoc: |
classModelGenerator < Base# :nodoc: |
argument:attributes,type: :array,default: [],banner: 'field[:type][:index] field[:type][:index]' |
check_class_collision |
class_option:migration,type: :boolean |
class_option:timestamps,type: :boolean |
class_option:parent,type: :string,desc: 'The parent class for the generated model' |
class_option:indexes,type: :boolean,default: true,desc: 'Add indexes for references and belongs_to columns' |
class_option:primary_key_type,type: :string,desc: 'The type for primary key' |
class_option:database,type: :string,aliases: %i(--db),desc: 'The database for your model's migration. By default, the current environment's primary database is used.' |
# creates the migration file for the model. |
defcreate_migration_file |
returnunlessoptions[:migration] && options[:parent].nil? |
attributes.each{ |a| a.attr_options.delete(:index)ifa.reference? && !a.has_index?}ifoptions[:indexes]false |
migration_template'././migration/templates/create_table_migration.rb',File.join(db_migrate_path,'create_#{table_name}.rb') |
end |
defcreate_model_file |
template'model.rb',File.join('app/models',class_path,'#{file_name}.rb') |
end |
defcreate_module_file |
returnifregular_class_path.empty? |
template'module.rb',File.join('app/models','#{class_path.join('/')}.rb')ifbehavior:invoke |
end |
hook_for:test_framework |
private |
defattributes_with_index |
attributes.select{ |a| !a.reference? && a.has_index?} |
end |
# Used by the migration template to determine the parent name of the model |
defparent_class_name |
options[:parent] || 'ApplicationRecord' |
end |
end |
end |
end |
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Cheat Sheets are greate but they are not a substitute for learning the framework and reading the documentation as we most certainly have not covered every potential example here. Please refer to the Rails Command Line Docs for more information.
![View View](/uploads/1/2/5/8/125870210/637709540.jpg)
Command Line Generator Info
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 generate GENERATOR --help
will list the options that can be passed to the specified generator.Rails Generate Examples
Create a Resource
Generate Models
Scaffold with ERB and API namespaced to /api/v1
Add Column to Existing Model
Column Types
Adding a Unique Property to a Field
Many to Many Relationship (Reference)
Remember that you do not want an id for the join table, so make sure to add :id => false |t|
If you use rails
you will have two indexes, but what you want is
Generate all combinations of key value pairs java. For Rails 5 use create_join_table instead.
Adding Modifiers (Reference)
Modifiers are inserted through curly braces and they allow you to include things such as null and limit.
Add an age to a Friend with a limit
Add a price to a product with 2 decimals
Would result in a migration with a
scale
of 2
and percision
of 10
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Create a new model with a reference to another model (Reference)
Resulting migrations:
Polymorphism (Reference)
Suppose your building a collaborative app (like Pivotal Tracker and you want to add comments to projects, tasks, and attachments. You can do that by making comments polymorphic.
Column Defaults (Reference)
Default migration generator does not handle default values (column modifiers are supported but do not include default or null), but you could create your own generator.
You can also manually update the migration file prior to running rake db:migrate by adding the options to add_column:
.. and read Rails API
Rspec Generators
will create a new spec file in
spec/models/widget_spec.rb
The same generator pattern is available for all specs:
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Rails Generate Model Primary Key Function
Generating specific views