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b70f2a1434
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/5253 GitOrigin-RevId: ab9dd99ce654cda299504bfe6be2f3240c2f82e2
66 lines
1.5 KiB
Haskell
66 lines
1.5 KiB
Haskell
module Hasura.RQL.IR.OrderBy
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( OrderByCol (..),
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OrderByItemG (..),
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OrderByItem,
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-- used by RQL.DML.Types
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orderByColFromTxt,
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)
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where
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import Data.Aeson
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import Data.Text qualified as T
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import Hasura.Prelude
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import Hasura.RQL.Types.Backend
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import Hasura.RQL.Types.Common
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import Hasura.SQL.Backend
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-- order by col
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data OrderByCol
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= OCPG FieldName
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| OCRel FieldName OrderByCol
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deriving (Show, Eq)
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instance FromJSON OrderByCol where
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parseJSON = \case
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(String t) -> orderByColFromToks $ T.split (== '.') t
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v -> parseJSON v >>= orderByColFromToks
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orderByColFromToks ::
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(MonadFail m) =>
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[Text] ->
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m OrderByCol
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orderByColFromToks toks = do
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when (any T.null toks) $ fail "col/rel cannot be empty"
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case toks of
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[] -> fail "failed to parse an OrderByCol: found empty cols"
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x : xs -> return $ go (FieldName x) xs
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where
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go fld = \case
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[] -> OCPG fld
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x : xs -> OCRel fld $ go (FieldName x) xs
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orderByColFromTxt ::
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(MonadFail m) =>
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Text ->
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m OrderByCol
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orderByColFromTxt =
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orderByColFromToks . T.split (== '.')
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-- order by item
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data OrderByItemG (b :: BackendType) a = OrderByItemG
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{ obiType :: Maybe (BasicOrderType b),
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obiColumn :: a,
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obiNulls :: Maybe (NullsOrderType b)
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}
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deriving (Functor, Foldable, Traversable, Generic)
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deriving instance (Backend b, Show a) => Show (OrderByItemG b a)
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deriving instance (Backend b, Eq a) => Eq (OrderByItemG b a)
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instance (Backend b, Hashable a) => Hashable (OrderByItemG b a)
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type OrderByItem b = OrderByItemG b OrderByCol
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