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Class: ActiveRecord::ConnectionAdapters::MySQL::SchemaDumper

Do not use. This class is for internal use only.

Constant Summary

::ActiveRecord::ConnectionAdapters::SchemaDumper - Inherited

DEFAULT_DATETIME_PRECISION

Class Attribute Summary

::ActiveRecord::SchemaDumper - Inherited

.chk_ignore_pattern

Specify a custom regular expression matching check constraints which name should not be dumped to db/schema.rb.
.excl_ignore_pattern

Specify a custom regular expression matching exclusion constraints which name should not be dumped to db/schema.rb.
.fk_ignore_pattern

Specify a custom regular expression matching foreign keys which name should not be dumped to db/schema.rb.
.ignore_tables

A list of tables which should not be dumped to the schema.
.unique_ignore_pattern

Specify a custom regular expression matching unique constraints which name should not be dumped to db/schema.rb.

Class Method Summary

::ActiveRecord::ConnectionAdapters::SchemaDumper - Inherited

.create

::ActiveRecord::SchemaDumper - Inherited

.dump, .generate_options, .new

Instance Attribute Summary

::ActiveRecord::SchemaDumper - Inherited

#chk_ignore_pattern, #excl_ignore_pattern, #fk_ignore_pattern, #ignore_tables, #unique_ignore_pattern, #table_name

Instance Method Summary

::ActiveRecord::ConnectionAdapters::SchemaDumper - Inherited

#column_spec, #column_spec_for_primary_key, #default_primary_key?, #explicit_primary_key_default?, #prepare_column_options, #schema_collation, #schema_default, #schema_expression, #schema_limit, #schema_precision, #schema_scale, #schema_type, #schema_type_with_virtual

::ActiveRecord::SchemaDumper - Inherited

#dump, #check_constraints_in_create, #define_params,
#extensions

extensions are only supported by ::ActiveRecord::ConnectionAdapters::PostgreSQL.
#foreign_keys, #format_colspec, #format_index_parts, #format_options,
#formatted_version

turns 20170404131909 into “2017_04_04_131909”.
#header, #ignored?, #index_parts,
#indexes

Keep it for indexing materialized views.
#indexes_in_create, #remove_prefix_and_suffix,
#schemas

schemas are only supported by ::ActiveRecord::ConnectionAdapters::PostgreSQL.
#table, #tables, #trailer,
#types

(enum) types are only supported by ::ActiveRecord::ConnectionAdapters::PostgreSQL.

Constructor Details

This class inherits a constructor from ActiveRecord::SchemaDumper

Instance Method Details

#column_spec_for_primary_key(column) (private)

[ GitHub ] 

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 26



def column_spec_for_primary_key(column)
  spec = super
  spec.delete(:auto_increment) if column.type == :integer && column.auto_increment?
  spec
end


  








  

    #default_primary_key?(column)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 32



def default_primary_key?(column)
  super && column.auto_increment? && !column.unsigned?
end


  








  

    #explicit_primary_key_default?(column)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 36



def explicit_primary_key_default?(column)
  column.type == :integer && !column.auto_increment?
end


  








  

    #extract_expression_for_virtual_column(column)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 74



def extract_expression_for_virtual_column(column)
  if @connection.mariadb? && @connection.database_version < "10.2.5"
    create_table_info = @connection.send(:create_table_info, table_name)
    column_name = @connection.quote_column_name(column.name)
    if %r/#{column_name} #{Regexp.quote(column.sql_type)}(?: COLLATE \w+)? AS \((?<expression>.+?)\) #{column.extra}/ =~ create_table_info
      $~[:expression].inspect
    end
  else
    scope = @connection.send(:quoted_scope, table_name)
    column_name = @connection.quote(column.name)
    sql = "SELECT generation_expression FROM information_schema.columns" \
          " WHERE table_schema = #{scope[:schema]}" \
          "   AND table_name = #{scope[:name]}" \
          "   AND column_name = #{column_name}"
    # Calling .inspect leads into issues with the query result
    # which already returns escaped quotes.
    # We remove the escape sequence from the result in order to deal with double escaping issues.
    @connection.query_value(sql, "SCHEMA").gsub("\\'", "'").inspect
  end
end


  








  

    #prepare_column_options(column)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 8



def prepare_column_options(column)
  spec = super
  spec[:unsigned] = "true" if column.unsigned?
  spec[:auto_increment] = "true" if column.auto_increment?

  if /\A(?<size>tiny|medium|long)(?:text|blob)/ =~ column.sql_type
    spec = { size: size.to_sym.inspect }.merge!(spec)
  end

  if @connection.supports_virtual_columns? && column.virtual?
    spec[:as] = extract_expression_for_virtual_column(column)
    spec[:stored] = "true" if /\b(?:STORED|PERSISTENT)\b/.match?(column.extra)
    spec = { type: schema_type(column).inspect }.merge!(spec)
  end

  spec
end


  








  

    #schema_collation(column)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 65



def schema_collation(column)
  if column.collation
    @table_collation_cache ||= {}
    @table_collation_cache[table_name] ||=
      @connection.internal_exec_query("SHOW TABLE STATUS LIKE #{@connection.quote(table_name)}", "SCHEMA").first["Collation"]
    column.collation.inspect if column.collation != @table_collation_cache[table_name]
  end
end


  








  

    #schema_limit(column)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 51



def schema_limit(column)
  super unless /\A(?:tiny|medium|long)?(?:text|blob)\b/.match?(column.sql_type)
end


  








  

    #schema_precision(column)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 55



def schema_precision(column)
  if /\Atime(?:stamp)?\b/.match?(column.sql_type) && column.precision == 0
    nil
  elsif column.type == :datetime
    column.precision == 0 ? "nil" : super
  else
    super
  end
end


  








  

    #schema_type(column)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb', line 40



def schema_type(column)
  case column.sql_type
  when /\Atimestamp\b/
    :timestamp
  when /\A(?:enum|set)\b/
    column.sql_type
  else
    super
  end
end