Rails 6 added changes for slice! method to ActiveModel::Errors

rails_6_slice.rb

# Rails 6

> user = User.new
=> #<User id: nil, name: nil, email: nil, rating: 0, password: nil, created_at: nil, updated_at: nil>

> user.valid?
=> false

> user.errors
=> #<ActiveModel::Errors:0x00007fc46700df10 @base=##<User id: nil, name: nil, email: nil, rating: 0, password: nil, created_at: nil, updated_at: nil>, @messages={:email=>["can't be blank"], :password=>["can't be blank"]}, @details={:email=>[{:error=>:blank}], :password=>[{:error=>:blank}]}>

> user.errors.slice!(:email)
=> {:password=>["can't be blank"]}

> user.errors
=> #<ActiveModel::Errors:0x00007fc46700df10 @base=##<User id: nil, name: nil, email: nil, rating: 0, password: nil, created_at: nil, updated_at: nil>, @messages={:email=>["can't be blank"]}, @details={:email=>[{:error=>:blank}]}>