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  1. oneToMaybe_ :: forall be (db :: (Type -> Type) -> Type) tbl rel s . (BeamSqlBackend be, Database be db, Table tbl, Table rel, HasTableEqualityNullable be (PrimaryKey tbl)) => DatabaseEntity be db (TableEntity rel) -> (rel (QExpr be s) -> PrimaryKey tbl (Nullable (QExpr be s))) -> tbl (QExpr be s) -> Q be db s (rel (Nullable (QExpr be s)))

    beam-core Database.Beam.Query

    Used to define one-to-many (or one-to-one) relationships with a nullable foreign key. Takes the table to fetch, a way to extract the foreign key from that table, and the table to relate to.

  2. toUpdatedValueMaybe :: (forall s . () => table (QExpr be s) -> Maybe (QExpr be s a)) -> QFieldAssignment be table a

    beam-core Database.Beam.Query

    Use with set to optionally set a fiield to a new value, calculated based on one or more fields from the existing row

  3. getMaybeValue :: CollectErrors es v -> Maybe v

    collect-errors Control.CollectErrors

    No documentation available.

  4. getMaybeValue :: CollectErrors es v -> Maybe v

    collect-errors Control.CollectErrors.Type

    No documentation available.

  5. class HasMaybeLength e

    elynx-tree ELynx.Tree.Length

    Class of data types that may have a length.

  6. getMaybeLength :: HasMaybeLength e => e -> Maybe Length

    elynx-tree ELynx.Tree.Length

    No documentation available.

  7. class HasMaybeSupport e

    elynx-tree ELynx.Tree.Support

    Class of data types that may have a support value.

  8. getMaybeSupport :: HasMaybeSupport e => e -> Maybe Support

    elynx-tree ELynx.Tree.Support

    No documentation available.

  9. toMaybe :: Process e a -> Maybe e

    ghc-events GHC.RTS.Events.Analysis

    No documentation available.

  10. fetchMaybe :: (HasCallStack, MonadDB m, MonadThrow m, FromRow row) => (row -> t) -> m (Maybe t)

    hpqtypes Database.PostgreSQL.PQTypes.Fold

    Specialization of foldlDB that fetches one or zero rows. If more rows are delivered, AffectedRowsMismatch exception is thrown.

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