Serializer Validation
Validation runs in a fixed order during is_valid(): per-field validators and validate_<field>() methods, then object-level validate() for cross-field rules, raising ValidationError to populate .errors and yield an HTTP 400. Class-level validators like UniqueTogetherValidator enforce database constraints before the write is attempted.
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Validation runs in a fixed order during is_valid(): per-field validators and validate_<field>() methods, then object-level validate() for cross-field rules, raising ValidationError to populate .errors and yield an HTTP 400. Class-level validators like UniqueTogetherValidator enforce database constraints before the write is attempted.
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