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How to change type of existing model objects?

  • Thread starter Thread starter Coder4Fun250
  • Start date Start date
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Coder4Fun250

Guest
I had a model Topic with date_added field type set to TimeField

Code:
class Topic(models.Model):
    """A topic the user is learning about"""
    text = models.CharField(max_length=200)
    date_added = models.TimeField(auto_now_add=True)
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

    def __str__(self):
        """Return a string representation of the model"""
        return self.text

But later I realized that I need to change the type to DateTimeField. I changed it in the model definition and migrated

Code:
class Topic(models.Model):
    """A topic the user is learning about"""
    text = models.CharField(max_length=200)
    date_added = models.DateTimeField(auto_now_add=True)
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

    def __str__(self):
        """Return a string representation of the model"""
        return self.text

But the type of existing Topic objects are still TimeField which I figured out by running these commands in the Django shell:

Code:
>>> field = Topic._meta.get_field('date_added')
>>> print(isinstance(field, DateTimeField))
False
>>> type(field)
<class 'django.db.models.fields.TimeField'>

I tried searching it up online but didn't find anything. Chat GPT advised to manually change migration files which seems like a bad idea to me.

How to achieve what I want?
<p>I had a model Topic with date_added field type set to TimeField</p>
<pre><code>class Topic(models.Model):
"""A topic the user is learning about"""
text = models.CharField(max_length=200)
date_added = models.TimeField(auto_now_add=True)
owner = models.ForeignKey(User, on_delete=models.CASCADE)

def __str__(self):
"""Return a string representation of the model"""
return self.text
</code></pre>
<p>But later I realized that I need to change the type to DateTimeField. I changed it in the model definition and migrated</p>
<pre><code>class Topic(models.Model):
"""A topic the user is learning about"""
text = models.CharField(max_length=200)
date_added = models.DateTimeField(auto_now_add=True)
owner = models.ForeignKey(User, on_delete=models.CASCADE)

def __str__(self):
"""Return a string representation of the model"""
return self.text
</code></pre>
<p>But the type of existing Topic objects are still TimeField which I figured out by running these commands in the Django shell:</p>
<pre><code>>>> field = Topic._meta.get_field('date_added')
>>> print(isinstance(field, DateTimeField))
False
>>> type(field)
<class 'django.db.models.fields.TimeField'>
</code></pre>
<p>I tried searching it up online but didn't find anything. Chat GPT advised to manually change migration files which seems like a bad idea to me.</p>
<p>How to achieve what I want?</p>
 

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