Class: DynamicImage::Generators::UpgradeGenerator

Inherits:
Rails::Generators::NamedBase
  • Object
show all
Includes:
ActiveRecord::Generators::Migration
Defined in:
lib/rails/generators/dynamic_image/upgrade/upgrade_generator.rb

Overview

Brings an existing table up to date with Schema.

bin/rails generate dynamic_image:upgrade Image

The migration is derived from the difference between the table and the schema, so running the generator again once the migration has been applied writes nothing. An application several releases behind gets a single migration with everything it's missing.

Only additive changes are generated. Columns are added nullable, and nullability differences are reported instead of altered: change_column_null fails on existing NULLs, and the generator can't know whether the data allows it.

Instance Method Summary collapse

Instance Method Details

#create_upgrade_migration ⇒ Object 



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# File 'lib/rails/generators/dynamic_image/upgrade/upgrade_generator.rb', line 27

def create_upgrade_migration
  if missing_columns.empty? && missing_indexes.empty?
    say_status(:identical, "#{table_name} is up to date", :blue)
    return
  end

  migration_template("upgrade_migration.rb",
                     File.join(db_migrate_path, "#{migration_name}.rb"))
end

#report_index_locking ⇒ Object 



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# File 'lib/rails/generators/dynamic_image/upgrade/upgrade_generator.rb', line 45

def report_index_locking
  return if missing_indexes.empty?

  say_status(:warn,
             "adding an index locks the table while it builds",
             :yellow)
end

#report_nullability ⇒ Object 



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# File 'lib/rails/generators/dynamic_image/upgrade/upgrade_generator.rb', line 37

def report_nullability
  nullable_in_table.each do |name|
    say_status(:warn,
               "#{table_name}.#{name} should be NOT NULL",
               :yellow)
  end
end