How to get the raw 'created_at' value in the database (not an object cast to an ActiveSupport::TimeWithZone)

问题

Imagine I have a Post Model.

and one record in the database will be:

23|title_here|content_here|2011-02-20 08:01:55.583222|2011-02-20 08:01:55.583222

and the last two field (2011-02-20 08:01:55.583222|2011-02-20 08:01:55.583222 ) are the created_at and updated_at field.

Then,

post = Post.find_by_id(23)

Question: How can I get the created_at string: "2011-02-20 08:01:55.583222" in the data base?

As we know, the post.created_at will return a ActiveSupport::TimeWithZone object, not the raw string.

Please help :)

回答1:

use attributes_before_type_cast

Post.find(23).attributes_before_type_cast["created_at"]

or

Post.find(23).read_attribute_before_type_cast("created_at")

Edit

You can call like this also:

Post.find(23).created_at_before_type_cast

according to Accessing attributes before they have been typecasted.

回答2:

Try

Post.find_by_id(23).created_at.to_s

来源：https://stackoverflow.com/questions/5056447/how-to-get-the-raw-created-at-value-in-the-database-not-an-object-cast-to-an