Remove models with same set of field.

It would be good if we can identify that a similar model exists and use that model instead of creating a new model, especially when the FIELDS and DATA-TYPE are same.

For example, when my data is as follows,

{
    "Arm Right": {
        "Joint 1": 5,
        "Joint 2": 3, 
        "Joint 3": 66
    }, 
    "Arm Left": {
        "Joint 1": 55,
        "Joint 2": 13, 
        "Joint 3": 6
    }
}

we get the following output,

class ArmRight(BaseModel):
    Joint_1: int = Field(..., alias='Joint 1')
    Joint_2: int = Field(..., alias='Joint 2')
    Joint_3: int = Field(..., alias='Joint 3')

class ArmLeft(BaseModel):
    Joint_1: int = Field(..., alias='Joint 1')
    Joint_2: int = Field(..., alias='Joint 2')
    Joint_3: int = Field(..., alias='Joint 3')

class Model(BaseModel):
    Arm_Right: ArmRight = Field(..., alias='Arm Right')
    Arm_Left: ArmLeft = Field(..., alias='Arm Left')

Describe the solution you’d like I think it would be good if we can detect that models for ArmLeft and ArmRight are the same, and then to just use one of these models. For example,

class ArmRight (BaseModel):
    Joint_1: int = Field(..., alias='Joint 1')
    Joint_2: int = Field(..., alias='Joint 2')
    Joint_3: int = Field(..., alias='Joint 3')

class Model(BaseModel):
    Arm_Right: ArmRight = Field(..., alias='Arm Right')
    Arm_Left: ArmRight = Field(..., alias='Arm Left')

Describe alternatives you’ve considered Currently, I just delete manually. But, we have a big system with many similar structures in JSON and many time we need to manually delete about 1000 models. 😦

Thank you very much for this excellent tool.

[koxudaxi]

@gk-patel Thank you for creating this issue. I think it’s a good idea. The behavior may have to be an option of the command line 🤔

I will implement this feature after remove bugs.

[koxudaxi]

@gk-patel OK. I released a new version as 0.6.17 This version has changed your idea.

https://github.com/koxudaxi/datamodel-code-generator/blob/ada9b19d4c51b22ac4d4a872794416ad71f329cd/tests/data/expected/main/main_json_reuse_model/output.py#L16-L26

The enum will reuse the same model. A duplicate model will be created too. Because some models may need the enum from other modules. https://github.com/koxudaxi/datamodel-code-generator/blob/ada9b19d4c51b22ac4d4a872794416ad71f329cd/tests/data/expected/main/main_json_reuse_enum/output.py#L13-L28