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3c3ed55914
This PR makes a bunch of schema generation code in Hasura.GraphQL.Schema backend-agnostic, by moving the backend-specific parts into a new BackendSchema type class. This way, the schema generation code can be reused for other backends, simply by implementing new instances of the BackendSchema type class. This work is now in a state where the schema generators are sufficiently generic to accept the implementation of a new backend. That means that we can start exposing MS SQL schema. Execution is not implemented yet, of course. The branch currently does not support computed fields or Relay. This is, in a sense, intentional: computed field support is normally baked into the schema generation (through the fieldSelection schema generator), and so this branch shows a programming technique that allows us to expose certain GraphQL schema depending on backend support. We can write support for computed fields and Relay at a later stage. Co-authored-by: Antoine Leblanc <antoine@hasura.io> GitOrigin-RevId: df369fc3d189cbda1b931d31678e9450a6601314
54 lines
2.2 KiB
Haskell
54 lines
2.2 KiB
Haskell
module Hasura.Backends.Postgres.Translate.Update
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( mkUpdateCTE
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) where
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import Hasura.Prelude
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import qualified Hasura.Backends.Postgres.SQL.DML as S
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import Hasura.Backends.Postgres.SQL.Types
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import Hasura.Backends.Postgres.Translate.BoolExp
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import Hasura.Backends.Postgres.Translate.Insert
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import Hasura.Backends.Postgres.Translate.Returning
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import Hasura.RQL.IR.Update
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import Hasura.RQL.Types
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import Hasura.SQL.Types
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mkUpdateCTE
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:: AnnUpd 'Postgres -> S.CTE
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mkUpdateCTE (AnnUpd tn opExps (permFltr, wc) chk _ columnsInfo) =
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S.CTEUpdate update
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where
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update =
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S.SQLUpdate tn setExp Nothing tableFltr
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. Just
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. S.RetExp
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$ [ S.selectStar
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, asCheckErrorExtractor $ insertCheckConstraint checkExpr
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]
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setExp = S.SetExp $ map (expandOperator columnsInfo) opExps
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tableFltr = Just $ S.WhereFrag tableFltrExpr
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tableFltrExpr = toSQLBoolExp (S.QualTable tn) $ andAnnBoolExps permFltr wc
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checkExpr = toSQLBoolExp (S.QualTable tn) chk
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expandOperator :: [ColumnInfo 'Postgres] -> (PGCol, UpdOpExpG S.SQLExp) -> S.SetExpItem
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expandOperator infos (column, op) = S.SetExpItem $ (column,) $ case op of
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UpdSet e -> e
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UpdInc e -> S.mkSQLOpExp S.incOp identifier (asNum e)
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UpdAppend e -> S.mkSQLOpExp S.jsonbConcatOp identifier (asJSON e)
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UpdPrepend e -> S.mkSQLOpExp S.jsonbConcatOp (asJSON e) identifier
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UpdDeleteKey e -> S.mkSQLOpExp S.jsonbDeleteOp identifier (asText e)
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UpdDeleteElem e -> S.mkSQLOpExp S.jsonbDeleteOp identifier (asInt e)
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UpdDeleteAtPath a -> S.mkSQLOpExp S.jsonbDeleteAtPathOp identifier (asArray a)
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where
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identifier = S.SEIdentifier $ toIdentifier column
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asInt e = S.SETyAnn e S.intTypeAnn
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asText e = S.SETyAnn e S.textTypeAnn
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asJSON e = S.SETyAnn e S.jsonbTypeAnn
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asArray a = S.SETyAnn (S.SEArray a) S.textArrTypeAnn
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asNum e = S.SETyAnn e $
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case find (\info -> pgiColumn info == column) infos <&> pgiType of
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Just (ColumnScalar s) -> S.mkTypeAnn $ CollectableTypeScalar s
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_ -> S.numericTypeAnn
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