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PR-URL: https://github.com/hasura/graphql-engine-mono/pull/7692 GitOrigin-RevId: c4e8d6ff2defe6c0ecd96a7233636fe0ebae1a85
82 lines
2.8 KiB
Haskell
82 lines
2.8 KiB
Haskell
-- | This module defines the top-level translation functions pertaining to
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-- translating Connection (i.e. Relay) queries into Postgres AST.
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module Hasura.Backends.Postgres.Translate.Select.Connection
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( connectionSelectQuerySQL,
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mkConnectionSelect,
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)
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where
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import Control.Monad.Writer (runWriter)
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import Database.PG.Query (Query)
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import Hasura.Backends.Postgres.SQL.DML qualified as S
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import Hasura.Backends.Postgres.SQL.Types
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import Hasura.Backends.Postgres.Translate.Select.AnnotatedFieldJSON
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import Hasura.Backends.Postgres.Translate.Select.Internal.GenerateSelect (connectionToSelectWith)
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import Hasura.Backends.Postgres.Translate.Select.Internal.Helpers (customSQLToTopLevelCTEs, toQuery)
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import Hasura.Backends.Postgres.Translate.Select.Internal.Process (processConnectionSelect)
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import Hasura.Backends.Postgres.Translate.Types
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import Hasura.Prelude
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import Hasura.RQL.IR.Select
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( AnnSelectG (_asnStrfyNum),
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ConnectionSelect (_csSelect),
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)
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import Hasura.RQL.Types.Backend (Backend)
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import Hasura.RQL.Types.Common (FieldName (FieldName))
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import Hasura.SQL.Backend (BackendType (Postgres))
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-- | Translates IR to Postgres queries for "connection" queries (used for Relay).
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--
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-- See 'mkConnectionSelect' for the Postgres AST.
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connectionSelectQuerySQL ::
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forall pgKind.
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( Backend ('Postgres pgKind),
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PostgresAnnotatedFieldJSON pgKind
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) =>
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ConnectionSelect ('Postgres pgKind) Void S.SQLExp ->
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Query
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connectionSelectQuerySQL =
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toQuery
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. ( \(selectWith, customCTEs) ->
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selectWith
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{ S.swCTEs =
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map (fmap S.CTESelect) (S.swCTEs selectWith)
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<> customSQLToTopLevelCTEs customCTEs
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}
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)
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. runWriter
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. mkConnectionSelect
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mkConnectionSelect ::
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forall pgKind m.
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( Backend ('Postgres pgKind),
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PostgresAnnotatedFieldJSON pgKind,
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MonadWriter CustomSQLCTEs m
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) =>
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ConnectionSelect ('Postgres pgKind) Void S.SQLExp ->
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m (S.SelectWithG S.Select)
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mkConnectionSelect connectionSelect = do
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let ( (connectionSource, topExtractor, nodeExtractors),
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SelectWriter {_swJoinTree = joinTree, _swCustomSQLCTEs = customSQLCTEs}
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) =
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runWriter $
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flip runReaderT strfyNum $
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processConnectionSelect
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sourcePrefixes
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rootFieldName
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(S.toTableAlias rootIdentifier)
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mempty
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connectionSelect
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selectNode =
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MultiRowSelectNode [topExtractor] $
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SelectNode nodeExtractors joinTree
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selectWith =
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connectionToSelectWith (S.toTableAlias rootIdentifier) connectionSource selectNode
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tell customSQLCTEs
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pure selectWith
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where
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strfyNum = _asnStrfyNum $ _csSelect connectionSelect
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rootFieldName = FieldName "root"
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rootIdentifier = toIdentifier rootFieldName
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sourcePrefixes = SourcePrefixes rootIdentifier rootIdentifier
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