Add ignore_columns integration

[palkan]

From: #89 (comment)

The idea is the following: we want to reduce the data loaded from DB by not loading log_data column by default (using ignored_columns feature), and only load log_data when explicitly specified (e.g. via with_log_data scope).

The proposed API:

class User < ActiveRecord::Base
  has_logidze ignore_log_data: true
end

User.all #=> SELECT id, name FROM users

User.with_log_data #=> SELECT id, name, log_data FROM users

(optional, maybe, another PR) Add an easier way to access log_data on a single record, e.g.:

user = User.find(params[:id])
user.log_data #=> raises (or nil?) since column is ignored
user.log_data! #=> loads log_data from DB

[palkan]

^ FYI @igas

[igas]

O.o I don’t use logidze. It’s probably @noma4i who spoke with you on RubyConf

[palkan]

O.o I don’t use logidze. It’s probably @noma4i who spoke with you on RubyConf

oops) sorry 🤦‍♂️ Yep, it was him) thanks!