Part units (#4854)

* Add validation to part units field

* Add "pack_units" field to the SupplierPart model

* Migrate old units to new units, and remove old field

* Table fix

* Fixture fix

* Update migration

* Improve "hook" for loading custom unit database

* Display part units column in part table

- Also allow ordering by part units
- Allow filtering to show parts which have defined units

* Adds data migration for converting units to valid values

* Add "pack_units_native" field to company.SupplierPart model

* Clean pack units when saving a SupplierPart

- Convert to native part units
- Handle empty units value
- Add unit tests

* Add background function to rebuild supplier parts when a part is saved

- Required to ensure that the "pack_size_native" is up to date

* Template updates

* Sort by native units first

* Bump API version

* Rename "pack_units" to "pack_quantity"

* Update migration file

- Allow reverse migration

* Fix for currency migration

- Handle case where no currencies are provided
- Handle case where base currency is not in provided options

* Adds unit test for data migration

* Add unit test for part.units data migration

- Check that units fields are updated correctly

* Add some extra "default units"

- each / piece
- dozen / hundred / thousand
- Add unit testing also

* Update references to "pack_size"

- Replace with "pack_quantity" or "pack_quantity_native" as appropriate

* Improvements based on unit testing

* catch error

* Docs updates

* Fixes for pricing tests

* Update unit tests for part migrations · 1b6b6d9d

* Bug fix for conversion code

* javascript updates

* JS formatting fix

InvenTree/templates/js/translated/company.js

@@ -138,7 +138,7 @@ function supplierPartFields(options={}) {
         packaging: {
             icon: 'fa-box',
         },
-        pack_size: {},
+        pack_quantity: {},
     };
 
     if (options.part) {
@@ -1242,17 +1242,24 @@ function loadSupplierPartTable(table, url, options) {
                 sortable: true,
             },
             {
-                field: 'pack_size',
+                field: 'pack_quantity',
                 title: '{% trans "Pack Quantity" %}',
                 sortable: true,
                 formatter: function(value, row) {
-                    var output = `${value}`;
 
-                    if (row.part_detail && row.part_detail.units) {
-                        output += ` ${row.part_detail.units}`;
+                    let html = '';
+
+                    if (value) {
+                        html = value;
+                    } else {
+                        html = '-';
                     }
 
-                    return output;
+                    if (row.part_detail && row.part_detail.units) {
+                        html += `<span class='fas fa-info-circle float-right' title='{% trans "Base Units" %}: ${row.part_detail.units}'></span>`;
+                    }
+
+                    return html;
                 }
             },
             {