Not able to update data in one-to-one relation in typeOrm

I am trying to update my productDetails table and productMaster table.

here is my relation I have added ,

ProductMaster.ts

@OneToOne(type => ProductDetails, productDetails => productDetails.productMaster,{
    cascade: ["insert", "update"]
})
productDetails: ProductDetails;

ProductDetails.ts

@OneToOne(type => ProductMaster,  productMaster => productMaster.productDetails,{
    cascade: ["insert", "update"]
})
@JoinColumn({name: 'prd_id', referencedColumnName: 'prd_id'})
productMaster: ProductMaster;

Now I have to update my productMaster and productDetails using typeOrm relations.

Here What I tried,

productMasterRepository
        .createQueryBuilder()
        .update()
        .set({
           prd_name : 'my Product Name'
           productDetails : {
               prd_brand : 'My Product Brand Name'
           }
          })
        .where("prd_id = :prd_id", {prd_id: 1})
        .execute();

But it doesn't update.

can anyone please help on this. and I am new to typeOrm.

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