Ruby on Rails: SQLite3 to PostgreSQL null date?

NULL and '' (the empty string) are different things. Some databases, like MySQL and apparently SQLite, allow you to treat them as the same thing, but they are not. '' is not a valid date.

PostgreSQL won't accept another common MySQL-ism 0000-00-00 either; watch out for that in case you're used to using that as a placeholder or "invalid" value.

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