# Resolve “Could not dump table because of following FrozenError can’t modify frozen String: “false”

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If you encountered this problem in your `schema.rb` file:

\# Could not dump table "users" because of following FrozenError  
\#   can't modify frozen String: "false"

Then, do the following:

1.  Create file `config/initializers/prepare_column_options.rb` with the following content:

module ActiveRecord  
  module ConnectionAdapters  
    module ColumnDumper  
      def prepare\_column\_options(column, types)  
        spec = {}  
        spec\[:name\]      = column.name.inspect  
        spec\[:type\]      = column.type.to\_s  
        spec\[:null\]      = 'false' unless column.null  
  
        limit = column.limit || types\[column.type\]\[:limit\]  
        spec\[:limit\]     = limit.inspect if limit  
        spec\[:precision\] = column.precision.inspect if column.precision  
        spec\[:scale\]     = column.scale.inspect if column.scale  
  
        default = schema\_default(column).dup if column.has\_default?  
        spec\[:default\]   = default unless default.nil?  
  
        spec  
      end  
    end  
  end  
end

2\. Run `bundle exec rake db:schema:dump` to recreate the `schema.rb` file.

And you will not see the following error in your `schema.rb` file anymore when you run `rails db:migrate`.

Source: [Abdul Rehman at Stack Overflow](https://stackoverflow.com/a/68708411).