How can I get the datatype of an attribute from a Rails model?

Question

I am using Postgres in a Rails project and I have discovered that I need to change all of my varchar datatypes to citext . Rather than do this by hand, I want to just create a migration that loops through all of the models and their attributes and converts them as necessary.

Most of these models are empty, so it's not a matter of instantiating them. I need to find out if ActiveRecord "knows" what the datatype of its corresponding database column is.

Answer 1

@model.column_for_attribute('title').type

那可能就是你要找的东西。