How to fetch rows from a table based on a field which is present in a different table having a foreign key relationship with it?

Question

I have two tables as follows in Django:

Table1: 
    - id
    - name
    - address
    - state
    - short_code
    
Table2: 
    - id
    - table1_id
    - p1, property (searchable field)

Relationship between Table1 and Table2: Table1(1) -> Table2(n) [ 1->n ]

Let’s say I have a searchable property p1 in Table2. How to fetch all the rows from Table1 which is satisfying the following query parameters?

short_code(table1 field), state(table1 field), and property as p1(table2 field)

Remember, Table1 has 1:n relationship with Table2, so Table2 can have multiple rows satisfying foreign key relationship of field id from Table1.

Asked By: NEW VK

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Source

Answer 1

You can do related lookups:

class MyModel1(models.Model):
   model2 = models.ForeignKey('myapp.MyModel2', related_name='model1',...)

class MyModel2(models.Model):
   fields...

Now you can do:

MyModel1.objects.filter(model2__pk=YOUR_MODEL2_PK)

Or

MyModel2.objects.filter(model1__pk=YOUR_MODEL_1_PK)

You can limit the results returned with .only()

Note:

Have a look at the docs for many to one relationships

Or the docs for querysets

Answered By: nigel239

How to fetch rows from a table based on a field which is present in a different table having a foreign key relationship with it?

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