pub fn concrete_mutation_type(&self) -> Option<&MetaType<S>> {
        self.mutation_type_name.as_ref().map(|name| {
            self.concrete_type_by_name(name)
                .expect("Mutation type does not exist in schema")
        })
    }
/// Get the concrete mutation type from the schema.
Get the concrete mutation type from the schema.
Get the concrete mutation type from the schema .
pub fn concrete_mutation_type(&self) -> Option<&MetaType<S>> {
        self.mutation_type_name.as_ref().map(|name| {
            self.concrete_type_by_name(name)
                .expect("Mutation type does not exist in schema")
        })
    }
pub fn concrete_mutation_type ( & self ) -> Option < & MetaType < S > > { self . mutation_type_name . as_ref ( ) . map ( | name | { self . concrete_type_by_name ( name ) . expect ( " " ) } ) }
Get the concrete mutation type from the schema.
Get the concrete mutation type from the schema .
&self
&self