list up rails mode unique validations and table unique indexes

listup.rb

require 'json'

results = {}

ActiveRecord::Base.connection.tables.each do |table_name|
  klass = table_name.classify.safe_constantize
  next unless klass

  results[table_name] = {}

  klass.validators.each do |validator|
    next unless validator.class == ActiveRecord::Validations::UniquenessValidator
    results[table_name][:validators] ||= []
    results[table_name][:validators].push("#{validator.attributes}, #{validator.options}")
  end 

  ActiveRecord::Base.connection.indexes(table_name).each do |index|
    next unless index.unique
    results[table_name][:indexes] ||= []
    results[table_name][:indexes].push(index.columns.to_s)
  end 
end

p JSON.generate(results)