How to fetch the item unit conversion rate by code on stock item screen

Not sure if this is what you’re looking for, but this is a really helpful set of tools that could be used to return that value:

For instance:

decimal? conversionFactor = 1m;
INUnitAttribute.ConvertFromTo<InventoryItem.inventoryID>(Base.Item.Cache, Base.Item.Current, "CASE", "LB", conversionFactor);

Expected value of conversionFactor: 60.0

​@aleksandrsechin 
\App_RuntimeCode\InventoryItemMaint.cs(52): error CS0246: The type or namespace name 'P' could not be found (are you missing a using directive or an assembly reference?)
I’ve got the above error, when I am trying to use the code below:
 

INUnit uom = SelectFrom<INUnit>
    .Where<INUnit.inventoryID.IsEqual<@P.AsInt>
        .And<INUnit.fromUnit.IsEqual<@P.AsString>>
        .And<INUnit.toUnit.IsEqual<@P.AsString>>>
    .View(Base)
    .SelectSingle(row.InventoryID, "CASE", "LB"); 

Make sure you’ve added the following using directive:

using PX.Data.BQL;

Additionally, add the new keyword to your BQL query as follows:

INUnit uom = new SelectFrom<INUnit>
...

​@aleksandrsechin   Hello, Thank you for your help. What you provide is mightbe Fluent-BQL.
I tried the below code, it also worked

        INUnit uom = PXSelect<INUnit,Where<INUnit.inventoryID, Equal<Required<InventoryItem.inventoryID>>,  
        And<INUnit.fromUnit, Equal<Required<INUnit.fromUnit>>,
            And<INUnit.toUnit, Equal<Required<INUnit.toUnit>>>>>>.Select(Base, row.InventoryID, "CASE", "LB");