emit references for columns with foreign keys

src/PgStructure.hs

@@ -36,6 +36,9 @@ data ForeignKey = ForeignKey {
   fkTable::String, fkCol::String
 } deriving (Eq, Show)
 
+instance JSON.ToJSON ForeignKey where
+  toJSON fk = JSON.object ["table".=fkTable fk, "column".=fkCol fk]
+
 foreignKeys :: String -> String -> Connection -> IO (Map.Map String ForeignKey)
 foreignKeys schema table conn = do
   r <- quickQuery conn
@@ -78,6 +81,7 @@ instance JSON.ToJSON Column where
     , "updatable" .= colUpdatable c
     , "maxLen"    .= colMaxLen c
     , "precision" .= colPrecision c
+    , "references".= colFK c
     , "default"   .= colDefault c ]
 
 data TableOptions = TableOptions {

test/Feature/StructureSpec.hs

@@ -1,3 +1,4 @@
+{-# OPTIONS_GHC -fno-warn-missing-signatures #-}
 {-# LANGUAGE OverloadedStrings, QuasiQuotes #-}
 module Feature.StructureSpec where
 
@@ -8,15 +9,26 @@ import Test.Hspec.Wai.JSON
 import SpecHelper
 
 import Network.HTTP.Types
+import Codec.Binary.Base64.String (encode)
+import Data.Monoid ((<>))
+import Data.String.Conversions (cs)
+
+uName = "a user"
+uPass = "nobody can ever know"
+uRole = "dbapi_test"
 
 spec :: Spec
-spec = around appWithFixture $ do
+spec = around withDatabaseConnection $
+  aroundWith (withUser uName uPass uRole) $ aroundWith withApp $ do
   describe "GET /" $
     it "lists views in schema" $
-      get "/" `shouldRespondWith`
-        [json| [
-          {"schema":"1","name":"auto_incrementing_pk","insertable":true}
+      request methodGet "/"
+        [("Authorization", "Basic "<>(cs.encode $ cs uName<>":"<>cs uPass))] ""
+        `shouldRespondWith` [json| [
+        {"schema":"1","name":"authors_only","insertable":true}
+        , {"schema":"1","name":"auto_incrementing_pk","insertable":true}
         , {"schema":"1","name":"compound_pk","insertable":true}
+        , {"schema":"1","name":"has_fk","insertable":true}
         , {"schema":"1","name":"items","insertable":true}
         , {"schema":"1","name":"menagerie","insertable":true}
         , {"schema":"1","name":"no_pk","insertable":true}
@@ -24,7 +36,7 @@ spec = around appWithFixture $ do
         ] |]
         {matchStatus = 200}
 
-  describe "Table info" $
+  describe "Table info" $ do
     it "is available with OPTIONS verb" $
       request methodOptions "/auto_incrementing_pk" [] "" `shouldRespondWith` [json|
       {
@@ -39,6 +51,7 @@ spec = around appWithFixture $ do
             "maxLen": null,
             "nullable": false,
             "position": 1,
+            "references": null,
             "default": "nextval('\"1\".auto_incrementing_pk_id_seq'::regclass)"
           }, {
             "precision": null,
@@ -49,6 +62,7 @@ spec = around appWithFixture $ do
             "maxLen": null,
             "nullable": true,
             "position": 2,
+            "references": null,
             "default": null
           }, {
             "precision": null,
@@ -59,6 +73,7 @@ spec = around appWithFixture $ do
             "maxLen": null,
             "nullable": false,
             "position": 3,
+            "references": null,
             "default": null
           }, {
             "precision": null,
@@ -69,8 +84,54 @@ spec = around appWithFixture $ do
             "maxLen": null,
             "nullable": true,
             "position": 4,
+            "references": null,
             "default": "now()"
           }
         ]
       }
       |]
+
+    it "includes foreign key data" $
+      request methodOptions "/has_fk"
+        [("Authorization", "Basic "<>(cs.encode $ cs uName<>":"<>cs uPass))] ""
+        `shouldRespondWith` [json|
+      {
+        "pkey": ["id"],
+        "columns":[
+          {
+            "default": "nextval('\"1\".has_fk_id_seq'::regclass)",
+            "precision": 64,
+            "updatable": true,
+            "schema": "1",
+            "name": "id",
+            "type": "bigint",
+            "maxLen": null,
+            "nullable": false,
+            "position": 1,
+            "references": null
+          }, {
+            "default": null,
+            "precision": 32,
+            "updatable": true,
+            "schema": "1",
+            "name": "auto_inc_fk",
+            "type": "integer",
+            "maxLen": null,
+            "nullable": true,
+            "position": 2,
+            "references": {"table": "auto_incrementing_pk", "column": "id"}
+          }, {
+            "default": null,
+            "precision": null,
+            "updatable": true,
+            "schema": "1",
+            "name": "simple_fk",
+            "type": "character varying",
+            "maxLen": 255,
+            "nullable": true,
+            "position": 3,
+            "references": {"table": "simple_pk", "column": "k"}
+          }
+        ]
+      }
+      |]