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A create, read, update or delete (CRUD) method should only care about
the object which provides the receiver and the relations to its child
objects.
For example the method
func (r *Recipe) Create(tx *sql.Tx) error {}
should only create the relational data inside the database for the
recipe, not for the steps nested into this Recipe struct. This should be
covered by the
func (s *Step) Create(tx *sql.Tx) error {}
method which is then called by `func (r *Recipe) Create()`.
This has the advantage that every CRUD method has a constraint scope and
is more unified since the Step CRUD methods now have a Step struct as
receiver instead of a Recipe receiver.
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This provides the infrastructure to create views and HTTP handlers to
provide recipe steps.
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This simple model is used to test if it is helpful to implement the four
CRUD methods create, read, update and delete all inside the model
package.
The model package should also provide the datastructures for these
operations (well suited for the required views) aswell as tests for
them.
With this approach it should be possible to easily implement the view
and controller package because most of the logic is already inside the
model package and is tested.
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This provides the basic table structure to the database.
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