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feat: add one to one relationship for embedding

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BREAKING CHANGE: For the cases where one to one relationships are
detected, json objects will be returned instead of json arrays of length
1.

If you wish to override this behavior, you can use computed
relationships to return arrays again.
This commit is contained in:
steve-chavez
2022-08-18 22:36:47 -05:00
committed by Steve Chavez
parent 2afe13fa89
commit c45e85c5a6
15 changed files with 332 additions and 38 deletions
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src/PostgREST/Request/DbRequestBuilder.hs
+6
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@@ -149,6 +149,8 @@ addJoinConditions previousAlias (Node (query@Select{fromAlias=tblAlias}, nodePro
toJoinCondition previousAlias tblAlias tN ftN <$> cols
M2O _ cols ->
toJoinCondition previousAlias tblAlias tN ftN <$> cols
O2O _ cols ->
toJoinCondition previousAlias tblAlias tN ftN <$> cols
toJoinCondition :: Maybe Alias -> Maybe Alias -> Text -> Text -> (FieldName, FieldName) -> JoinCondition
toJoinCondition prAl newAl tb ftb (c, fc) =
let qi1 = QualifiedIdentifier tSchema ftb
@@ -171,14 +173,17 @@ findRel schema allRels origin target hint =
matchFKSingleCol hint_ card = case card of
O2M _ [(col, _)] -> hint_ == col
M2O _ [(col, _)] -> hint_ == col
O2O _ [(col, _)] -> hint_ == col
_ -> False
matchFKRefSingleCol hint_ card = case card of
O2M _ [(_, fCol)] -> hint_ == fCol
M2O _ [(_, fCol)] -> hint_ == fCol
O2O _ [(_, fCol)] -> hint_ == fCol
_ -> False
matchConstraint tar card = case card of
O2M cons _ -> tar == cons
M2O cons _ -> tar == cons
O2O cons _ -> tar == cons
_ -> False
matchJunction hint_ card = case card of
M2M Junction{junTable} -> hint_ == qiName junTable
@@ -364,6 +369,7 @@ returningCols rr@(Node _ forest) pkCols
fkCols = concat $ mapMaybe (\case
Node (_, (_, Just Relationship{relCardinality=O2M _ cols}, _, _, _, _)) _ -> Just $ fst <$> cols
Node (_, (_, Just Relationship{relCardinality=M2O _ cols}, _, _, _, _)) _ -> Just $ fst <$> cols
Node (_, (_, Just Relationship{relCardinality=O2O _ cols}, _, _, _, _)) _ -> Just $ fst <$> cols
Node (_, (_, Just Relationship{relCardinality=M2M Junction{junColumns1, junColumns2}}, _, _, _, _)) _ -> Just $ (fst <$> junColumns1) ++ (fst <$> junColumns2)
_ -> Nothing
) forest