Generate enum class as an inner class when defined in a model

When an enum is defined as part of a model, the enum class generated is a standalone class.

For example, for

Model:
   ...
   properties:
      enumDefinition:
         type: ...
         enum:
            - x
            - y

an enum class named EnumDefinition would be generated.

This would result in generation of enum classes like EnumDefinition, EnumDefinition1, EnumDefinition2 etc. when the same enum property name is defined across different models.

Instead of this, would it be possible to generate an enum class as an inner class of the model class, in which they are defined as a property? For the example above, each model with enumDefinition property would have its own inner class EnumDefinition.

[cansukaynak]

@koxudaxi Yes, --use-title-as-name is indeed quite helpful for my use case. Thanks!

[koxudaxi]

@cansukaynak

With the inner class option, I would like to use the same enum name, but a different set of values in each enum definition.

I think we should not use the inner class for the pydantic model. Also, the rule makes it complex to generate models.

I added a new feature to use a title as a model name. https://github.com/koxudaxi/datamodel-code-generator/pull/510

the PR is not released yet. but, if you can use the feature then you can control the enum name by the title. What do you think about it?