fix: ignore max-rows on POST/PATCH/PUT/DELETE

CHANGELOG.md

@@ -42,6 +42,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
  - #2153, Fix --dump-schema running with a wrong PG version. - @wolfgangwalther
  - #2042, Keep working when EMFILE(Too many open files) is reached. - @steve-chavez
  - #2147, Ignore `Content-Type` headers for `GET` requests when calling RPCs. Previously, `GET` without parameters, but with `Content-Type: text/plain` or `Content-Type: application/octet-stream` would fail with `404 Not Found`, even if a function without arguments was available.
+ - #2155, Ignore `max-rows` on POST, PATCH, PUT and DELETE - @steve-chavez
 
 ### Changed
 
@@ -49,6 +50,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
    + Previously, those RPCs would return "null" as a body with Content-Type: application/json.
  - #2156, `limit/offset` now limits the affected rows on UPDATE/DELETE  - @steve-chavez
    + Previously, `limit/offset` only limited the returned rows but not the actual updated rows
+ - #2155, `max-rows` is no longer applied on POST/PATCH/PUT/DELETE returned rows - @steve-chavez
+   + This was misleading because the affected rows were not really affected by `max-rows`, only the returned rows were limited
 
 ## [9.0.0] - 2021-11-25
 

src/PostgREST/Request/DbRequestBuilder.hs

@@ -63,7 +63,7 @@ import Protolude hiding (from)
 readRequest :: Schema -> TableName -> Maybe Integer -> [Relationship] -> ApiRequest -> Either Error ReadRequest
 readRequest schema rootTableName maxRows allRels apiRequest  =
   mapLeft ApiRequestError $
-  treeRestrictRange maxRows =<<
+  treeRestrictRange maxRows (iAction apiRequest) =<<
   augmentRequestWithJoin schema rootRels =<<
   addLogicTrees apiRequest =<<
   addRanges apiRequest =<<
@@ -115,8 +115,9 @@ initReadRequest rootQi =
               fldForest:rForest
 
 -- | Enforces the `max-rows` config on the result
-treeRestrictRange :: Maybe Integer -> ReadRequest -> Either ApiRequestError ReadRequest
-treeRestrictRange maxRows request = pure $ nodeRestrictRange maxRows <$> request
+treeRestrictRange :: Maybe Integer -> Action -> ReadRequest -> Either ApiRequestError ReadRequest
+treeRestrictRange _ (ActionMutate _) request = Right request
+treeRestrictRange maxRows _ request = pure $ nodeRestrictRange maxRows <$> request
   where
     nodeRestrictRange :: Maybe Integer -> ReadNode -> ReadNode
     nodeRestrictRange m (q@Select {range_=r}, i) = (q{range_=restrictRange m r }, i)

test/spec/Feature/Query/QueryLimitedSpec.hs

@@ -77,3 +77,40 @@ spec =
             , matchHeaders = [ matchContentTypeJson
                              , "Content-Range" <:> "0-1/3" ]
             }
+
+    context "max-rows=2 on mutations" $ do
+      it "doesn't affect insertions" $
+        request methodPost "/projects?select=id,name"
+            [("Prefer", "return=representation")]
+            [json| [
+              { "id": 6, "name": "BeOS" },
+              { "id": 7, "name": "PopOS" },
+              { "id": 8, "name": "HaikuOS" } ]|]
+          `shouldRespondWith`
+            [json| [
+              { "id": 6, "name": "BeOS" },
+              { "id": 7, "name": "PopOS" },
+              { "id": 8, "name": "HaikuOS" } ]|]
+            { matchStatus  = 201 }
+
+      it "doesn't affect updates" $
+        request methodPatch "/employees?select=first_name,last_name,occupation"
+            [("Prefer", "return=representation")]
+            [json| [{"occupation": "Barista"}] |]
+          `shouldRespondWith`
+            [json|[
+                { "first_name": "Frances M.", "last_name": "Roe", "occupation": "Barista" },
+                { "first_name": "Daniel B.", "last_name": "Lyon", "occupation": "Barista" },
+                { "first_name": "Edwin S.", "last_name": "Smith", "occupation": "Barista" } ]|]
+            { matchStatus  = 200 }
+
+      it "doesn't affect deletions" $
+        request methodDelete "/employees?select=first_name,last_name"
+            [("Prefer", "return=representation")]
+            mempty
+          `shouldRespondWith`
+            [json| [
+              { "first_name": "Frances M.", "last_name": "Roe" },
+              { "first_name": "Daniel B.", "last_name": "Lyon" },
+              { "first_name": "Edwin S.", "last_name": "Smith" } ]|]
+            { matchStatus  = 200 }