# Stock Valuation Layer Category Groupby

## Description

This module allows grouping by product category in the stock valuation layer reports.

### Problem

By default, the `categ_id` field in `stock.valuation.layer` is a related field without storage (`store=False`). This means it cannot be used for grouping in reports and pivot views, even though it can be used for filtering and searching.

### Solution

This module makes the `categ_id` field stored (`store=True`) and indexed, which enables:
- Grouping by product category in list views
- Grouping by product category in pivot views
- Grouping by product category in graph views
- Better performance when filtering by category

## Installation

1. Install the module from the Apps menu
2. The field will be automatically populated for existing records

## Usage

After installation:
1. Go to Inventory > Reporting > Inventory Valuation
2. Switch to Pivot or Graph view
3. Click on "Measures" or group options
4. You will now see "Product Category" available for grouping

## Technical Details

The module extends `stock.valuation.layer` model and modifies the `categ_id` field to:
- `store=True`: Store the value in the database
- `index=True`: Add database index for better performance

The field remains a related field, so it will automatically update when the product category changes.

## Bug Tracker

Bugs are tracked on [GitHub Issues](https://github.com/OCA/stock-logistics-warehouse/issues).

## Credits

### Contributors

* Criptomart

### Maintainers

This module is maintained by the OCA.

## Compatibility

- Odoo 16.0
- stock_account