Test for variable in nested json (#2374)

postgraphile/postgraphile/__tests__/queries/v4/json-nested-query.json5

@@ -0,0 +1,7 @@
+{
+  jsonIdentity: {
+    someValue: {
+      ohnoavariable: 42,
+    },
+  },
+}

postgraphile/postgraphile/__tests__/queries/v4/json-nested-query.mermaid

@@ -0,0 +1,42 @@
+%%{init: {'themeVariables': { 'fontSize': '12px'}}}%%
+graph TD
+    classDef path fill:#eee,stroke:#000,color:#000
+    classDef plan fill:#fff,stroke-width:1px,color:#000
+    classDef itemplan fill:#fff,stroke-width:2px,color:#000
+    classDef unbatchedplan fill:#dff,stroke-width:1px,color:#000
+    classDef sideeffectplan fill:#fcc,stroke-width:2px,color:#000
+    classDef bucket fill:#f6f6f6,color:#000,stroke-width:2px,text-align:left
+
+
+    %% plan dependencies
+    PgSelect9[["PgSelect[9∈0] ➊<br />ᐸjson_identityᐳ"]]:::plan
+    Object12{{"Object[12∈0] ➊<br />ᐸ{pgSettings,withPgClient}ᐳ"}}:::plan
+    __InputDynamicScalar6{{"__InputDynamicScalar[6∈0] ➊"}}:::plan
+    Object12 & __InputDynamicScalar6 --> PgSelect9
+    Access10{{"Access[10∈0] ➊<br />ᐸ2.pgSettingsᐳ"}}:::plan
+    Access11{{"Access[11∈0] ➊<br />ᐸ2.withPgClientᐳ"}}:::plan
+    Access10 & Access11 --> Object12
+    Access7{{"Access[7∈0] ➊<br />ᐸ0.valueᐳ"}}:::plan
+    Access7 --> __InputDynamicScalar6
+    __Value0["__Value[0∈0] ➊<br />ᐸvariableValuesᐳ"]:::plan
+    __Value0 --> Access7
+    __Value2["__Value[2∈0] ➊<br />ᐸcontextᐳ"]:::plan
+    __Value2 --> Access10
+    __Value2 --> Access11
+    First13{{"First[13∈0] ➊"}}:::plan
+    PgSelectRows14[["PgSelectRows[14∈0] ➊"]]:::plan
+    PgSelectRows14 --> First13
+    PgSelect9 --> PgSelectRows14
+    PgSelectSingle15{{"PgSelectSingle[15∈0] ➊<br />ᐸjson_identityᐳ"}}:::plan
+    First13 --> PgSelectSingle15
+    PgClassExpression16{{"PgClassExpression[16∈0] ➊<br />ᐸ__json_identity__.vᐳ"}}:::plan
+    PgSelectSingle15 --> PgClassExpression16
+    __Value4["__Value[4∈0] ➊<br />ᐸrootValueᐳ"]:::plan
+
+    %% define steps
+
+    subgraph "Buckets for queries/v4/json-nested-query"
+    Bucket0("Bucket 0 (root)<br /><br />1: <br />ᐳ: 7, 10, 11, 6, 12<br />2: PgSelect[9]<br />3: PgSelectRows[14]<br />ᐳ: 13, 15, 16"):::bucket
+    classDef bucket0 stroke:#696969
+    class Bucket0,__Value0,__Value2,__Value4,__InputDynamicScalar6,Access7,PgSelect9,Access10,Access11,Object12,First13,PgSelectRows14,PgSelectSingle15,PgClassExpression16 bucket0
+    end

postgraphile/postgraphile/__tests__/queries/v4/json-nested-query.sql

@@ -0,0 +1,3 @@
+select
+  __json_identity__.v::text as "0"
+from "c"."json_identity"($1::"json") as __json_identity__(v);

postgraphile/postgraphile/__tests__/queries/v4/json-nested-query.test.graphql

@@ -0,0 +1,7 @@
+## expect(errors).toBeFalsy();
+#> schema: ["a", "b", "c"]
+#> dynamicJson: true
+#> variableValues: {"value": 42}
+query Q($value: Int!) {
+  jsonIdentity(json: { someValue: { ohnoavariable: $value } })
+}