# README
Implementation rewrites DisableNestedTransaction by Settings.Propogation if it is PropagationNested.
# Functions
MustSettings returns Settings if err is nil and panics otherwise.
NewCtxGetter returns *CtxGetter to get *gorm.DB from context.Context.
NewDefaultFactory creates default trm.Transaction(gorm.DB).
NewSettings creates Settings.
NewTransaction creates trm.Transaction for sqlx.Tx.
WithTxOptions sets up sql.TxOptions for the Settings.
# Variables
DefaultCtxGetter is the CtxGetter with settings.DefaultCtxKey.
# Structs
CtxGetter gets Tr from trm.СtxManager by casting trm.Transaction to *gorm.DB.
Settings contains settings for Transaction.
Transaction is trm.Transaction for sqlx.Tx.
# Type aliases
Opt is a type to configure Settings.