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Rails will generate a name for every foreign key starting with fkrails followed by 10 characters which are deterministically generated from the fromtable and column. There is a:name option to specify a different name if needed. Generate a pair of ssh keys. Active Record only supports single column foreign keys. Jan 31, 2018 Creating a Model The most convenient way to create a model in Rails is to use a generator. We do this by going to the command line inside our application directory and running a Rails generate statement where we name the model we want to create along with the column names and the data type that will reside in each of those columns. The key references the id column of the authors table. If the column names can not be derived from the table names, you can use the:column and:primarykey options. Rails will generate a name for every foreign key starting with fkrails followed by 10 characters which are deterministically generated from the fromtable and column.

Rails Generate Model Primary Key

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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{aa.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

Rails Generate Model Primary Key Definition

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