Trait diesel::backend::DieselReserveSpecialization
source · pub trait DieselReserveSpecialization { }Expand description
This is a marker trait which indicates that
diesel may specialize a certain QueryFragment
impl in a later version. If you as a user encounter, where rustc
suggests adding this a bound to a type implementing Backend
consider adding the following bound instead
YourQueryType: QueryFragment<DB> (the concrete bound
is likely mentioned by rustc as part of a note: …)
For any user implementing a custom backend: You likely want to implement
this trait for your custom backend type to opt in the existing QueryFragment impls in diesel.
As indicated by the i-implement-a-third-party-backend-and-opt-into-breaking-changes feature
diesel reserves the right to specialize any generic QueryFragment
impl via SqlDialect in a later minor version release