Ndtyjky

I need to Create two Django models: “Patient” and “Embryo”.

“Patient” properties:
First Name (string)
Last Name (string)
Telephone Number (string)
Email (string)
Created At (datetime)

“Embryo” properties:
Name (string)
Analysis Results (text)
Created At (datetime)
Patient’s Full Name
Patient (foreign key)

I now need to Add a method to the “Patient” model that takes JSON string and creates new “Embryo” records.
Here’s the JSON string:

[

{

"name": "embryo_1",

"analysis_results": "46,XX"

},

{

"name": "embryo_2",

"analysis_results": "47,XY,+21"

},

{

"name": "embryo_3",

"analysis_results": "46,XY"

},

]

Below are my models that I created
I am not sure how to add a method to the “Patient” model that takes JSON string and creates new “Embryo” records.

class Patient(models.Model):

    first_name = models.CharField(max_length=25)

    last_name = models.CharField(max_length=35)

    phone = models.CharField(max_length=18)

    email = models.EmailField(unique=True)

    created_at =  models.DateTimeField(auto_now_add=True)







class Embryo(models.Model):

     name = models.CharField(max_length=45)

     analysis_result = models.Charfield(max_length=10)

     created_at = models.DateTimeField(auto_now_add=True)

     patient = models.ForeignKey(Patient, on_delete=models.CASCADE)



    @property

    def patient_full_name(self):

       return "%s %s" % (self.patient.first_name, self.patient.last_name)

You can add an instance method to the model class, just like any other python class.

• Load the dict from json string, (preferably, using json.loads).


• Instantiate a list of Embryo objects.


• Pass the list to bulk_create method to create multiple objects in one query.

Example:

import json



class Patient(models.Model):

    # fields



    def add_embryos(self, embryos_json_str='{}'):

        embryos = json.loads(embryos_json_str)



        embryo_objs = 

        for embryo in embryos:

            embryo_objs.append(Embryo(

                name=embryo['name'],

                analysis_result=embryo['analysis_results'],

                patient=self

            ))



        Embryo.objects.bulk_create(embryo_objs)

NOTE:

• You can wrap json.loads in a try-except block to not raise any unnecessary exceptions.


• If too many embryos objects in json, use batch_size argument of bulk_create to insert in batches.

A method specifically to do this may not be necessary:

You can use python's json.loads() to load into a list of dictionaries, and then loop over to create the models.

import json

At the beginning of your file, then in your view:

#get the string from your request or form or wherever you get it

dict_list = json.loads('[{...}, {...}, {...}]'



for entry in dict_list:

    Embryo.objects.create(**entry)

the (**entry) syntax unpacks your dict into kwargs

Hope this solves your problem! :)