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Django Project Patterns

Project development:

1. Describe
2. Design
3. Implement

What should be done for every Django/SPA project?

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Form and fields

form.fields: (BoundField) 1. form.visible_fields (BoundField) - not field.is_hidden 2. form.hidden_fields (BoundField) - field.is_hidden

form.iter = form.fields form.field_name = FloatField (UnBoundField)

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Django ORM relations

• Directional
• Idirectional = Bidirectional
• Unidirectional

Relations

• ManyToOne (M:1) - PK/FK relation
• OneToMany (1:M) - no SQL (reversed M:1)

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Django validation

Important note: direct model instance manager.create()/save() doesn't validate (run instance.full_clean()). Only form validate instance (calls instance.full_clean()).

ModelForm validation process (Form + Model instance):

1. form.is_valid()
2. form.errors()
3. form.full_clean() - populate errors and cleanded_data