Built-in options

When to use this section 

Use this section when you want to:

• pick the right option for a specific validation need, like presence, bounds, uniqueness, etc.;
• understand where an option can be declared (field, oneof, message);
• see minimal .proto snippets you can copy into a model.

Choose a page 

• Most field constraints — presence, bounds, patterns, nested validation, dependencies:
  Field-level options
• Enforce “one of these fields must be set” in a oneof:
  Options for oneof fields
• Cross-field rules on a message (“at least one group is set”):
  Message-level options
• Collections (repeated / map) — non-empty, uniqueness, per-element validation:
  Options for repeated and map fields

Source of truth 

For the canonical option definitions, see spine/options.proto in the Spine base libraries on GitHub.

What’s next 

• Field-level options
• Options for oneof fields
• Message-level options
• Options for repeated and map fields
• Using validators
• Custom validation