Ruby on Rails

On 1 April 2011 12:53, Madhusudhan H R <lists@ruby-forum.com> wrote:
> Colin Law wrote in post #990365:
>> On 1 April 2011 12:06, Madhusudhan H R <lists@ruby-forum.com> wrote:
>>> Hello,
>>>
>>> I developed an app with postgres DB but want to change the DB to
>>> sqlite3. I changed the database adapter in the database.yml file. When I
>>> run the migration most of it was successful but add_column was throwing
>>> an error
>>>
>>> "Cannot add a NOT NULL column with default value NULL: ALTER TABLE
>>> "rates" ADD "customer_id" integer NOT NULL".
>>
>> What is the line in your migration file that throws the error?  The
>> error suggests that it says that the column cannot be null, but with a
>> default value of NULL.
>
> Yes the error message is Cannot add a NOT NULL column with default value
> NULL: ALTER TABLE "rates" ADD "customer_id" integer NOT NULL
>
> The migration line which is causing the problem is
>
> add_column :rates, :customer_id, :integer, :null => false
>
> How can I fix this problem?

By providing a default value in the migration.

This may be helpful in explaining the issue and suggesting other alternatives.
http://strd6.com/2009/04/adding-a-non-null-column-with-no-default-value-in-a-rails-migration/

Colin

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