Fix tag creation while creating post

[camelya58]

Please, fix code in create and update methods of PostServiceRealization class (2 methods).
When you try in swagger to create or update some post, and fill the field "tags", must create a tag along with the post. And this tag you must find by this id in tag controller.
Consider that tag field "id" must generates automatically.

The situation is the same with nodes. The "id" creates automatically only in field connecting with one node, but nodes field "postId" doesn't generate automatically. You must fix it.

curl -X POST "http://post-reckue.apps.us-east-1.starter.openshift-online.com/posts" -H "accept: */*" -H "Content-Type: application/json" -d "{ \"nodes\": [ { \"node\": { \"type\": \"TEXT\" }, \"source\": \"string\", \"type\": \"TEXT\", \"userId\": \"string\" } ], \"source\": \"string\", \"status\": \"DRAFT\", \"tags\": [ { \"name\": \"string\" } ], \"title\": \"string\", \"userId\": \"string\"}"

Request must be like the following:

{
  "nodes": [
    {
      "node": {
        "type": "TEXT"
      },
      "source": "string",
      "type": "TEXT",
      "userId": "string"
    }
  ],
  "source": "string",
  "status": "DRAFT",
  "tags": [
    {
      "name": "string"
    }
  ],
  "title": "string",
  "userId": "string"
}

Expected response:
200 Ok

{
  "id": "5f57ea2f27706b19aefe4c44",
  "title": "string",
  "nodes": [
    {
      "id": "5f57ea2f27706b19aefe4c43",
      "type": "TEXT",
      "node": {
        "content": null
      },
      "postId": "5f57ea2f27706b19aefe4c44",
      "source": "string",
      "userId": "string",
      "createdDate": 1599597103260,
      "modificationDate": 1599597103260,
      "status": null
    }
  ],
  "source": "string",
  "userId": "string",
  "tags": [
    {
      "id": "5f57ea2f27706b19aefe4c42",
      "name": "string"
    }
  ],
  "createdDate": 1599597103266,
  "modificationDate": 1599597103266,
  "status": "DRAFT"
}

Actual response if you create with nodes field "postId" and tags field "id" :
200 Ok

{
  "id": "5f57ea2f27706b19aefe4c44",
  "title": "string",
  "nodes": [
    {
      "id": "5f57ea2f27706b19aefe4c43",
      "type": "TEXT",
      "node": {
        "content": null
      },
      "postId": "string",
      "source": "string",
      "userId": "string",
      "createdDate": 1599597103260,
      "modificationDate": 1599597103260,
      "status": null
    }
  ],
  "source": "string",
  "userId": "string",
  "tags": [
    {
      "id": "string",
      "name": "string"
    }
  ],
  "createdDate": 1599597103266,
  "modificationDate": 1599597103266,
  "status": "DRAFT"
}

Actual response if you try to create without nodes field "postId" and tags field "id" :
400 Bad Request

{
  "timestamp": "2020-09-08T20:37:29.173+0000",
  "status": 400,
  "error": "Bad Request",
  "errors": [
    {
      "codes": [
        "NotNull.postRequest.nodes[0].postId",
        "NotNull.postRequest.nodes.postId",
        "NotNull.nodes[0].postId",
        "NotNull.nodes.postId",
        "NotNull.postId",
        "NotNull.java.lang.String",
        "NotNull"
      ],
      "arguments": [
        {
          "codes": [
            "postRequest.nodes[0].postId",
            "nodes[0].postId"
          ],
          "arguments": null,
          "defaultMessage": "nodes[0].postId",
          "code": "nodes[0].postId"
        }
      ],
      "defaultMessage": "должно быть задано",
      "objectName": "postRequest",
      "field": "nodes[0].postId",
      "rejectedValue": null,
      "bindingFailure": false,
      "code": "NotNull"
    }
  ],
  "message": "Validation failed for object='postRequest'. Error count: 1",
  "path": "/posts"
}

When you fix it, please describe it in already existed docs.