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Contents
module Guts
# Handles tracking model changes through callbacks
module TrackableConcern
extend ActiveSupport::Concern
# Class methods for this concern
module ClassMethods
# Tracks changes to a model
# @param [Array] types an array of callbacks to watch from ActiveRecord
# @param [Hash] opts options for the tracker
# @option opts [Array] :fields list of fields to track changes on
# @example Example for Category model
# # Will track create and update, as well as title changes
# trackable :create, :update, fields: [:title]
# @note This uses `self.changes` from ActiveRecord to track fields
def trackable(*types, **opts)
# Loop over each type
types.each do |type|
# Start the callback on this modal
send :"after_#{type}" do
params = {}
# Check if we're watching for a specific field
if opts[:fields] && type == :update
# They do... grab those changes and merge them into our params
params = changes.select { |field| opts[:fields].include? field.to_sym }
end
# Finally, complete the track to the database if allowed
Tracker.create(action: type, object: self, params: params)
end
end
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems