database.rules.json

{
  "rules": {
    ".read": "true",
    "blog": {
      "blog-data": {
        ".write": "false"
      },
      "blog-slugs": {
        ".write": "false"
      },
      "comments": {
        "$parentId": {
          "$comment": {
            ".write": "auth != null && (!data.exists() || auth.uid === data.child('user').val())"
          }
        }
      },
      "comments-body-archive": {
        "$parentId": {
          "$comment": {
            ".write": "auth != null && !data.exists()"
          }
        }
      },
      "featured-posts": {
        "$title": {
          ".write": "auth != null && (!data.exists() || !newData.exists())"
        }
      },
      "responses": {
        "$parentId": {
          "$comment": {
            ".write": "auth != null && (!data.exists() || auth.uid === data.child('user').val())"
          }
        }
      },
      "responses-body-archive": {
        "$parentId": {
          "$comment": {
            ".write": "auth != null && !data.exists()"
          }
        }
      },
      "userNames": {
        "$userId": {
          ".write": "auth != null && (!data.exists() || auth.uid === $userId)"
        }
      },
      "users": {
        "$userId": {
          ".write": "auth != null && (!data.exists() || auth.uid === $userId)"
        }
      }
    },

    "client_case_study": {
      "client_case_study-data": {
        ".write": "false"
      },
      "client_case_study-slugs": {
        ".write": "false"
      },
      "featured-case-studies": {
        "$title": {
          ".write": "auth != null && (!data.exists() || !newData.exists())"
        }
      }
    }
  }
}