The Setup

1. Create a virtual environment, python 3.6+.
2. Install dependencies mentioned in requirements.txt file
3. To check if its working run : => python manage.py runserver
4. To apply in-built migrations: => python manage.py migrate
5. To populate masters, run: => python manage.py populate_masters
6. Your code goes in the transaction directory

The question

Objective:

To create APIs for a transaction.

Requirements:

Tech Stack - Django, Python 3.6+

For creation of APIs - Can use Django Rest Framework.

PART A: Models

1. Transaction

   1. Fields

      1. Unique Id - auto_generated primary field

      2. Company - linked to CompanyLedgerMaster - display CompanyLedgerMaster name in response

      3. Branch - linked to BranchMaster - display BranchMaster short_name in response

      4. Department - linked to DepartmentMaster- display DepartmentMaster name in response

      5. Transaction Number - unique for each transaction

         1. Format - TRN/{COUNT}/{YEAR}

         2. Count here should reset to 1 for every year.

      6. Transaction Status - Choice Field. Could be PENDING/COMPLETED/CLOSE

      7. Remarks - Char field. Is optional

2. Transaction Line Item Details

   1. Each transaction can have multiple item details

   2. Fields

      1. Unique Id - auto_generated primary field

      2. Article - linked to ArticleMaster- display ArticleMaster name in response

      3. Colour - linked to ColorMaster - display ColorMaster name in response

      4. Required on date - A date-time field

      5. Quantity - Decimal Field.

      6. Rate per unit - Integer Field

      7. Unit - Choice Field.Can be KG/METRE

3. Inventory Item

   1. Each above line item consists of multiple inventory items.

   2. Fields

      1. Unique Id - auto_generated primary field

      2. Article - linked to ArticleMaster- display ArticleMaster name in response

      3. Colour - linked to ColorMaster - display ColorMaster name in response

      4. Company -linked to CompanyLedgerMaster - display CompanyLedgerMaster Name in response

      5. Gross Quantity - Decimal field.

      6. Net Quantity - Decimal field.

      7. Unit - Choice Field.Can be KG/METRE

PART B: APIs to create

1. Add a transaction document with its line items.

2. Add line items once a transaction is created.

3. Add multiple inventory items to line items.

4. Delete a transaction, cant be deleted if inventory is created.

5. View a transaction with all its line items and their inventory items.

PART C: Validations (Optional)

1. Two line items in a transaction cant have same combination of article and colour.

2. Colour chosen should have a link with chosen article.

3. All response should be in a format:

{ "data": {}, "message": "", "status": <SOME HTTP STATUS CODE> }

Here,

If the response is successful, it should be returned in the "data" field ;

"message" tells us error in case of any.

"status" is an http response status code.