Using height_field and width_field attribute in ImageField of Django

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栀梦
栀梦 2021-02-05 16:04

I have a model

class Anh_chi_tiet(models.Model):
    du_an       = models.ForeignKey(Du_an)
    title       = models.CharField(max_length=120)
    url         =         


        
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  • 2021-02-05 16:19

    I think you are misunderstanding what the height_field and width_field attributes are for.

    The height_field isn't used to change the height. It's used to record what the height already is.

    This way you can do something like

    <img src="..." height={{my_instance.my_height_field}} /> 
    

    without having to read the file.

    If you are trying to resize all images uploaded via an ImageField, check here: Image resizing with django?

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  • 2021-02-05 16:34

    height_field represents a property of your model which is used to store the height.

    class Anh_chi_tiet(models.Model):
    
      url_height=models.PositiveIntegerField()
      url_width=models.PositiveIntegerField()
      url = models.ImageField(upload_to='images', height_field='url_height', width_field='url_width')
    

    Notice height_field='url_height'

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