Rails ActiveRecord，在Postgres中插入默认字段值

Question

This should be an easy one, but I've googled a fair bit.

I am trying to create a database log for my rails app. The log is a postgres table which has a timestamp field, which I have given a DEFAULT of current_timestamp . This works perfectly in raw SQL, if I leave the timestamp field out of my INSERT query, it gets the current timestamp correctly.

In rails I have;

entry = LogTable.new :fieldA => 'valA', :fieldB => 'valB'
entry.save

(LogTable extends ActiveRecord::Base)

Which results in an INSERT query that contains all fields, including the timestamp field set to NULL , which is not allowed by the database so it errors.

I have tried setting :timestamp => 'current_timestamp' and :timestamp => 'DEFAULT' but all end up trying to set it to NULL .

Answer 1

Is your current_timestamp just the current date/time? If so, you can stay simple and do something like:

entry = LogTable.new :fieldA => 'valA', :fieldB => 'valB', :timestamp => Time.now

If it's something more complex and you really want to use DB-side defaults, this page might help: http://drawohara.com/post/6677354/rails-activerecord-default-values .