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This allows to print a recipe with a fmt.Printf() call more easily:
fmt.Printf("%s\n", recipe)
This is also used for better error output in unit tests with t.Fatalf().
The Stringer interface is implemented with the JSON package because an
indented version of a recipe is a useful string representation.
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This allows to formulate the test data with an object-based model which
is easier than writing it down in a relational model.
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The new Go type 'Recipe' should contain every information directly
related to a recipe. It should be sufficient to pass it to a template to
directly render a HTML view or edit page for the recipe or to a template
to generate a PDF.
The CRUD methods are:
- func (r *Recipe) Create() error
- func (r *Recipe) Update() error
- func (r *Recipe) Read() error
- func (r *Recipe) Delete() error
Together with the type itself they are the interface the model package
provides for recipes.
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