# johnaljennegalos/django-pos-scanner architecture

> Architecture diagram of the GitHub repository johnaljennegalos/django-pos-scanner, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-29). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/johnaljennegalos/django-pos-scanner
- Repository: https://github.com/johnaljennegalos/django-pos-scanner

## Overview

This is a Django multi-branch retail POS and management system. The main workflow is an employee scanning products, building a cart, and submitting a cash or installment checkout; the server records the sale and updates branch stock. Separate workflows cover credit schedules, warranty claims, staff access, management reporting/exports, and audit logging. The README documents these product areas; sampled source confirms POS browser requests, checkout persistence, audit signal setup, and reminder email behavior, but not every view or subsystem implementation.

Main entry points: [`accounts/views.py`](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/views.py) (Application Views), [`pos/settings.py`](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/pos/settings.py) (Application Database), [`accounts/tasks.py`](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/tasks.py) (Due Reminders), [`static/js/posTerminal.js`](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/static/js/posTerminal.js) (POS Interaction)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_sales["Point of Sale"]
  node_pos_browser["POS Browser<br/>[pos_terminal.html]"]
  node_pos_js["POS Interaction<br/>[posTerminal.js]"]
  node_pos_ui["Cart and Checkout UI<br/>[posUI.js]"]
end

subgraph group_records["Retail Operations"]
  node_catalog["Product and Branch Stock<br/>[models.py]"]
  node_sales_records["Orders and Invoices<br/>[models.py]"]
  node_credit["Installment Plans<br/>[models.py]"]
  node_warranty["Warranty and Defects<br/>[views.py]"]
  node_staff["Employee and Supplier Admin<br/>[admin.py]"]
end

subgraph group_management["Management"]
  node_reports["Reports and CSV<br/>[views.py]"]
  node_reminders["Due Reminders<br/>[tasks.py]"]
end

subgraph group_governance["Access and Audit"]
  node_audit_middleware["Audit Middleware<br/>[middleware.py]"]
  node_audit_signals["Audit Signals<br/>[signals.py]"]
end

subgraph group_runtime["Django Runtime"]
  node_urls["URL Routing<br/>[urls.py]"]
  node_views["Application Views<br/>[views.py]"]
  node_models["Domain Models<br/>[models.py]"]
  node_database[("Application Database<br/>[settings.py]")]
  node_app_setup["Signal Registration<br/>[apps.py]"]
  node_templates["Django Templates"]
  node_settings["Django Configuration<br/>[settings.py]"]
end

node_employee(("Employee"))
node_scheduler(("Task Scheduler"))
node_email["Email Service"]

node_employee -->|"uses"| node_pos_browser
node_pos_browser -->|"loads interface"| node_pos_js
node_pos_js -->|"requests product scan"| node_views
node_pos_js -->|"updates cart"| node_pos_ui
node_pos_ui -->|"posts checkout"| node_views
node_views -->|"dispatched by"| node_urls
node_urls -->|"routes requests"| node_views
node_views -->|"queries and saves"| node_models
node_models -->|"persists records"| node_database
node_views -->|"renders pages"| node_templates
node_views -->|"reads and updates stock"| node_catalog
node_views -->|"creates sales"| node_sales_records
node_views -->|"creates plans"| node_credit
node_views -->|"processes claims"| node_warranty
node_staff -->|"administers records"| node_database
node_views -->|"builds reports and exports"| node_reports
node_audit_middleware -->|"captures request user"| node_views
node_app_setup -->|"registers receivers"| node_audit_signals
node_audit_signals -->|"records model changes"| node_database
node_scheduler -.->|"runs scheduled task"| node_reminders
node_reminders -->|"reads upcoming plans"| node_database
node_reminders -->|"sends reminders"| node_email
node_reminders -->|"renders reminder"| node_templates
node_settings -->|"configures connection"| node_database
node_settings -->|"configures email"| node_email

click node_pos_browser "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/templates/accounts/pos_terminal.html"
click node_pos_js "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/static/js/posTerminal.js"
click node_pos_ui "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/static/js/posUI.js"
click node_urls "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/urls.py"
click node_views "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/views.py"
click node_models "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py"
click node_database "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/pos/settings.py"
click node_catalog "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py"
click node_sales_records "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py"
click node_credit "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py"
click node_warranty "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/views.py"
click node_staff "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/admin.py"
click node_reports "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/views.py"
click node_audit_middleware "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/middleware.py"
click node_audit_signals "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/signals.py"
click node_app_setup "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/apps.py"
click node_reminders "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/tasks.py"
click node_templates "https://github.com/johnaljennegalos/django-pos-scanner/tree/main/accounts/templates"
click node_settings "https://github.com/johnaljennegalos/django-pos-scanner/blob/main/pos/settings.py"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_pos_browser,node_pos_js,node_pos_ui toneBlue
class node_catalog,node_sales_records,node_credit,node_warranty,node_staff toneAmber
class node_reports,node_reminders toneMint
class node_audit_middleware,node_audit_signals,node_scheduler toneRose
class node_urls,node_views,node_models,node_database,node_app_setup,node_templates,node_settings,node_employee,node_email toneIndigo
```

## Components

### Point of Sale

- [POS Browser](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/templates/accounts/pos_terminal.html): `accounts/templates/accounts/pos_terminal.html`
- [POS Interaction](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/static/js/posTerminal.js): `static/js/posTerminal.js`
- [Cart and Checkout UI](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/static/js/posUI.js): `static/js/posUI.js`

### Retail Operations

- [Product and Branch Stock](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py): `accounts/models.py`
- [Orders and Invoices](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py): `accounts/models.py`
- [Installment Plans](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py): `accounts/models.py`
- [Warranty and Defects](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/views.py): `accounts/views.py`
- [Employee and Supplier Admin](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/admin.py): `accounts/admin.py`

### Management

- [Reports and CSV](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/views.py): `accounts/views.py`
- [Due Reminders](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/tasks.py): `accounts/tasks.py`

### Access and Audit

- [Audit Middleware](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/middleware.py): `accounts/middleware.py`
- [Audit Signals](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/signals.py): `accounts/signals.py`

### Django Runtime

- [URL Routing](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/urls.py): `accounts/urls.py`
- [Application Views](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/views.py): `accounts/views.py`
- [Domain Models](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/models.py): `accounts/models.py`
- [Application Database](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/pos/settings.py): `pos/settings.py`
- [Signal Registration](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/accounts/apps.py): `accounts/apps.py`
- [Django Templates](https://github.com/johnaljennegalos/django-pos-scanner/tree/main/accounts/templates): `accounts/templates`
- [Django Configuration](https://github.com/johnaljennegalos/django-pos-scanner/blob/main/pos/settings.py): `pos/settings.py`

### Other components

- **Employee**
- **Task Scheduler**
- **Email Service**

## Connections

- Employee → POS Browser: uses
- POS Browser → POS Interaction: loads interface
- POS Interaction → Application Views: requests product scan
- POS Interaction → Cart and Checkout UI: updates cart
- Cart and Checkout UI → Application Views: posts checkout
- Application Views → URL Routing: dispatched by
- URL Routing → Application Views: routes requests
- Application Views → Domain Models: queries and saves
- Domain Models → Application Database: persists records
- Application Views → Django Templates: renders pages
- Application Views → Product and Branch Stock: reads and updates stock
- Application Views → Orders and Invoices: creates sales
- Application Views → Installment Plans: creates plans
- Application Views → Warranty and Defects: processes claims
- Employee and Supplier Admin → Application Database: administers records
- Application Views → Reports and CSV: builds reports and exports
- Audit Middleware → Application Views: captures request user
- Signal Registration → Audit Signals: registers receivers
- Audit Signals → Application Database: records model changes
- Task Scheduler → Due Reminders: runs scheduled task
- Due Reminders → Application Database: reads upcoming plans
- Due Reminders → Email Service: sends reminders
- Due Reminders → Django Templates: renders reminder
- Django Configuration → Application Database: configures connection
- Django Configuration → Email Service: configures email