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Stubs out a new model. Pass the model name, either CamelCased or
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under_scored, and an optional list of attribute pairs as arguments.
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Attribute pairs are column_name:sql_type arguments specifying the
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model's attributes. Timestamps are added by default, so you don't have to
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specify them by hand as 'created_at:datetime updated_at:datetime'.
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You don't have to think up every attribute up front, but it helps to
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sketch out a few so you can start working with the model immediately.
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This generates a model class in app/models, a unit test in test/unit,
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a test fixture in test/fixtures/singular_name.yml, and a migration in
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`./script/generate model account`
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creates an Account model, test, fixture, and migration:
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Model: app/models/account.rb
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Test: test/unit/account_test.rb
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Fixtures: test/fixtures/accounts.yml
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Migration: db/migrate/XXX_add_accounts.rb
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`./script/generate model post title:string body:text published:boolean`
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creates a Post model with a string title, text body, and published flag.