fix(Postgres Node): Allow passing in arrays to JSON columns for insert

[dana-gill]

Summary

An array is technically JSON. Postgres allows for this and we should
enable this for the insert node.

Workflow for testing:

{
  "nodes": [
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "d61ec233-ee6a-4580-9ba2-154546806f72",
              "name": "=obj",
              "value": "={{ [\n{data: [], name: 'mac',},\n{data: { age: 3 }, name: 'greg',},\n{data: [0,1], name: 'pat',},\n{data: [0], name: 'mig',}\n] }}",
              "type": "array"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.set",
      "typeVersion": 3.4,
      "position": [
        -20,
        200
      ],
      "id": "79367664-8958-463c-9b43-65858b5218d1",
      "name": "Edit Fields"
    },
    {
      "parameters": {
        "schema": {
          "__rl": true,
          "mode": "list",
          "value": "public"
        },
        "table": {
          "__rl": true,
          "value": "array_json_table",
          "mode": "list",
          "cachedResultName": "array_json_table"
        },
        "columns": {
          "mappingMode": "defineBelow",
          "value": {
            "data": "={{ $json.obj[2].data }}",
            "name": "={{ $json.obj[0].name}}"
          },
          "matchingColumns": [
            "id"
          ],
          "schema": [
            {
              "id": "id",
              "displayName": "id",
              "required": false,
              "defaultMatch": true,
              "display": true,
              "type": "number",
              "canBeUsedToMatch": true,
              "removed": true
            },
            {
              "id": "name",
              "displayName": "name",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "canBeUsedToMatch": true,
              "removed": false
            },
            {
              "id": "data",
              "displayName": "data",
              "required": true,
              "defaultMatch": false,
              "display": true,
              "type": "object",
              "canBeUsedToMatch": true
            }
          ],
          "ignoreTypeMismatchErrors": false,
          "attemptToConvertTypes": false,
          "convertFieldsToString": false
        },
        "options": {}
      },
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 2.5,
      "position": [
        240,
        200
      ],
      "id": "dc57fff2-cf66-495c-9270-97f2b208b11b",
      "name": "Postgres",
      "credentials": {
        "postgres": {
          "id": "UeO14x83grJWzgYI",
          "name": "dgl neon"
        }
      }
    }
  ],
  "connections": {
    "Edit Fields": {
      "main": [
        [
          {
            "node": "Postgres",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "pinData": {}
}

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/NODE-1705/postgres-node-cant-insert-an-array-into-json-column-in-postgres

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

📢 Thoughts on this report? Let us know!

[ShireenMissi]

LGTM 🎉

[github-actions]

⚠️ Some Cypress E2E specs are failing, please fix them before merging

[cypress]

n8n    Run #8647

Run Properties:   Passed #8647  •  d84b1c53ba: 🌳 🖥️ browsers:node18.12.0-chrome107 🤖 dana-gill 🗃️ e2e/*

Project	n8n
Branch Review	node-1705-insert-array-json
Run status	Passed #8647
Run duration	04m 53s
Commit	d84b1c53ba: 🌳 🖥️ browsers:node18.12.0-chrome107 🤖 dana-gill 🗃️ e2e/*
Committer	Dana Lee
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	1
Pending	0
Skipped	0
Passing	489
View all changes introduced in this branch ↗︎

[github-actions]

✅ All Cypress E2E specs passed

[janober]

Got released with [email protected]