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This article shows you what is the method of Django ManyToManyField query across intermediate tables, the content is concise and easy to understand, it can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

The method of query across Intermediate tables in Django ManyToManyField

1. Manytomany is used in the django table to generate the intermediate table pyclub_article_column.

From django.db import models

# Create your models here.

Class Column (models.Model):

Id = models.AutoField (u 'serial number', primary_key=True,auto_created=True)

Name = models.CharField (u 'name', max_length=100)

Published = models.DateField (u 'release time', auto_now_add=True)

Def _ str__ (self):

Return self.name

Class Meta:

Verbose_name = 'column'

Verbose_name_plural = 'column list'

Ordering = ['id'] # which column is sorted by

Class Article (models.Model):

Id = models.AutoField (u 'serial number', primary_key=True,auto_created=True)

Title = models.CharField (u' title', max_length=100,default='')

Content = models.TextField (u 'content', default='')

Column = models.ManyToManyField (Column,verbose_name=' ownership column')

Published = models.DateField (u 'release time', auto_now_add=True,null=True)

Def _ str__ (self):

Return self.title

Class Meta:

Verbose_name = 'article'

Verbose_name_plural = 'article list'

Ordering = ['id'] # which articles are sorted by

2. The intermediate table pyclub_article_column is generated

+-+

| | id | article_id | column_id | |

+-+

| | 370 | 411 | 146 | |

| | 371 | 412 | 146 | |

| | 372 | 413 | 165 | |

| | 373 | 414 | 158 | |

| | 374 | 415 | 151 | |

3. I want to get all the data lists in the corresponding column list through column_id. I never knew how to use the intermediate table. Now I understand that the result set column itself can also be used as an object, so the problem is simple.

List_info = Article.objects.filter (column=id)

Although there is no column in the article table, the correspondence has been established in django model.py through many to many, so in view.py, when you use article objects, you can directly use filter for category queries.

The above is what is the method of Django ManyToManyField query across intermediate tables, have you learned the knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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