from django.db import models
from pycs_api.models import base
from pycs_api.models.project import Project


class Label(base.BaseModel):

    project = models.ForeignKey(
        Project,
        on_delete=models.CASCADE
    )

    # recursive relation
    parent = models.ForeignKey(
        'self',
        on_delete=models.CASCADE
    )

    created = models.DateTimeField(auto_now_add=True)

    reference = models.CharField(max_length=255)


    class Meta:
        unique_together = [
            "project",
            "reference"
        ]