Fix for ActiveRecord::JDBCError: All parts of a PRIMARY KEY must be NOT NULL;

abstract_mysql2_adapter.rb

# class ActiveRecord::ConnectionAdapters::Mysql2Adapter
module ActiveRecord
  module ConnectionAdapters
    class AbstractMysqlAdapter < AbstractAdapter
    # https://github.com/rails/rails/blob/a4b55827721a5967299f3c1531afb3d6d81e4ac0/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb#L113-L126
    NATIVE_DATABASE_TYPES = {
        :primary_key => "int(11) auto_increment PRIMARY KEY",
        :string      => { :name => "varchar", :limit => 255 },
        :text        => { :name => "text" },
        :integer     => { :name => "int", :limit => 4 },
        :float       => { :name => "float" },
        :decimal     => { :name => "decimal" },
        :datetime    => { :name => "datetime" },
        :timestamp   => { :name => "datetime" },
        :time        => { :name => "time" },
        :date        => { :name => "date" },
        :binary      => { :name => "blob" },
        :boolean     => { :name => "tinyint", :limit => 1 }
      }
  
    def native_database_types
      NATIVE_DATABASE_TYPES
    end
  end

abstract_mysql2_adapter2.rb

# Example 2
# https://github.com/rails/rails/blob/a4b55827721a5967299f3c1531afb3d6d81e4ac0/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb#L113-L126
 
class ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter
    NATIVE_DATABASE_TYPES = {
        :primary_key => "int(11) auto_increment PRIMARY KEY",
        :string      => { :name => "varchar", :limit => 255 },
        :text        => { :name => "text" },
        :integer     => { :name => "int", :limit => 4 },
        :float       => { :name => "float" },
        :decimal     => { :name => "decimal" },
        :datetime    => { :name => "datetime" },
        :timestamp   => { :name => "datetime" },
        :time        => { :name => "time" },
        :date        => { :name => "date" },
        :binary      => { :name => "blob" },
        :boolean     => { :name => "tinyint", :limit => 1 }
      }
  
    def native_database_types
      NATIVE_DATABASE_TYPES
    end
  end


class ActiveRecord::ConnectionAdapters::Mysql2Adapter
  NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY"
end

class ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter
  NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY"
end