Migration Script failure - saving data to database

Problem/Motivation

The migration script does not take into account the message field could be longer than a 255 length varchar and it fails when trying to save a message of that length. In addition, because there can be multiple emails, sometimes the existing email value is returned as an array.

Steps to reproduce

Run the migration script.

Proposed resolution

For the message field:

• In content_reminders.schema.yml and content_reminders.install set the message field's
  • type attribute to text
  • size attribute to big
• In ReminderEntity.php for message field for the baseFieldDefinition create a string_long

type

For the returned existing email data:

• Check if the data returned is an array
• If the data is an array, implode the array to a string

Data model changes

Updating the message field from varchar (255) to longtext