Hi All,
I have created a simple database admin panel
(Django2..6+Python3.6+Mysql5.7) where admin can operate create/edit/delete
operations of database.
I am facing following IntegrityError error when I try to Merge two
products and click on Preview from my Django admin panel-
2018-07-02 16:17:56,428 [ERROR] exception.py:118
handle_uncaught_exception() : Internal Server Error:
/where2buy/merchantproduct/
Traceback (most recent call last):
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\django\db\backends\utils.py",
line 85, in _execute
return self.cursor.execute(sql, params)
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\django\db\backends\mysql\base.py",
line 71, in execute
return self.cursor.execute(query, args)
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\MySQLdb\cursors.py",
line 250, in execute
self.errorhandler(self, exc, value)
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\MySQLdb\connections.py",
line 50, in defaulterrorhandler
raise errorvalue
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\MySQLdb\cursors.py",
line 247, in execute
res = self._query(query)
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\MySQLdb\cursors.py",
line 411, in _query
rowcount = self._do_query(q)
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\MySQLdb\cursors.py",
line 374, in _do_query
db.query(q)
File
"C:\Users\prateek1.gupta\AppData\Local\Continuum\anaconda3\lib\site-packages\MySQLdb\connections.py",
line 277, in query
_mysql.connection.query(self, query)
_mysql_exceptions.IntegrityError: (1451, 'Cannot delete or update a parent
row: a foreign key constraint fails (`productsearchv2`.`feed`, CONSTRAINT
`feed_mproduct_id_fk` FOREIGN KEY (`merchant_id`, `merchant_product_id`)
REFERENCES `merchant_product` (`merchant_id`, `merchant_product_id`) ON
DELETE NO )')
I think issue is may be wrong relationship settings in my model file but
couldn't able to find exact issue.
Can anyone please help me to find the issue? My code is as below-
class MerchantProduct(models.Model):
merchant = models.ForeignKey(Merchant, on_delete=models.CASCADE)
product = models.ForeignKey(Product, on_delete=models.SET_NULL, blank=True,
null=True)
merchant_product_id = models.CharField(max_length=100)
gtin = models.CharField(max_length=15, blank=True, null=True)
merchant_group_id = models.CharField(max_length=100, blank=True, null=True)
name = models.CharField(max_length=300)
description = models.TextField(blank=True, null=True)
image_urls = models.TextField(blank=True, null=True)
image_phashes = models.TextField(blank=True, null=True)
web_url = models.URLField(blank=True, null=True)
brand = models.CharField(max_length=100, blank=True, null=True)
category = models.CharField(max_length=150, blank=True, null=True)
color = models.CharField(max_length=100, blank=True, null=True)
size = models.CharField(max_length=100, blank=True, null=True)
created_at = models.DateTimeField(auto_now_add=True, editable=False)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
unique_together = (('merchant', 'merchant_product_id'),)
managed = False
db_table = 'merchant_product'
def __str__(self):
return self.name
class Product(models.Model):
merchants = models.ManyToManyField(Merchant, through='MerchantProduct')
brand = models.ForeignKey(Brand, related_name='brand',
on_delete=models.SET_NULL, blank=True, null=True)
category = models.ForeignKey(Category, related_name='category',
on_delete=models.SET_NULL, blank=True, null=True)
group = models.ForeignKey('self', related_name='ID',
on_delete=models.SET_NULL, blank=True, null=True)
gtin = models.CharField(max_length=15, blank=True, null=True)
name = models.CharField(max_length=300)
description = models.TextField()
image_urls = models.TextField()
image_phashes = models.CharField(max_length=200, blank=True, null=True)
color = models.CharField(max_length=100, blank=True, null=True)
size = models.CharField(max_length=100, blank=True, null=True)
created_at = models.DateTimeField(auto_now_add=True, editable=False)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
managed = False
db_table = 'product'
def __str__(self):
return self.name
class Merchant(models.Model):
DATA_QUALITY_CHOICES = (
('approx', 'Approximate'),
('exact', 'Exact'),
)
name = models.CharField(unique=True, max_length=45)
display_name = models.CharField(unique=True, max_length=255)
url_name = models.CharField(unique=True, max_length=255)
data_quality = models.CharField(default='approx', max_length=6,
choices=DATA_QUALITY_CHOICES)
status = models.CharField(default='I', max_length=1, choices=STATUS_CHOICES)
featured_rank = models.PositiveSmallIntegerField(blank=True, null=True)
created_at = models.DateTimeField(auto_now_add=True, editable=False)
updated_at = models.DateTimeField(auto_now=True)
config = models.TextField(default='{}', max_length=500, blank=True,
null=True)
class Meta:
managed = False
db_table = 'merchant'
def __str__(self):
return self.name
Let me know if need any more info from side.
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