Method: ActiveRecord::ConnectionAdapters::PostgreSQL::SchemaStatements#rename_table

Defined in:
activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb

#rename_table(table_name, new_name, **options) ⇒ Object

Renames a table. Also renames a table’s primary key sequence if the sequence name exists and matches the Active Record default.

Example:

rename_table('octopuses', 'octopi')



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 434

def rename_table(table_name, new_name, **options)
  validate_table_length!(new_name) unless options[:_uses_legacy_table_name]
  clear_cache!
  schema_cache.clear_data_source_cache!(table_name.to_s)
  schema_cache.clear_data_source_cache!(new_name.to_s)
  execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
  pk, seq = pk_and_sequence_for(new_name)
  if pk
    # PostgreSQL automatically creates an index for PRIMARY KEY with name consisting of
    # truncated table name and "_pkey" suffix fitting into max_identifier_length number of characters.
    max_pkey_prefix = max_identifier_length - "_pkey".size
    idx = "#{table_name[0, max_pkey_prefix]}_pkey"
    new_idx = "#{new_name[0, max_pkey_prefix]}_pkey"
    execute "ALTER INDEX #{quote_table_name(idx)} RENAME TO #{quote_table_name(new_idx)}"

    # PostgreSQL automatically creates a sequence for PRIMARY KEY with name consisting of
    # truncated table name and "#{primary_key}_seq" suffix fitting into max_identifier_length number of characters.
    max_seq_prefix = max_identifier_length - "_#{pk}_seq".size
    if seq && seq.identifier == "#{table_name[0, max_seq_prefix]}_#{pk}_seq"
      new_seq = "#{new_name[0, max_seq_prefix]}_#{pk}_seq"
      execute "ALTER TABLE #{seq.quoted} RENAME TO #{quote_table_name(new_seq)}"
    end
  end
  rename_table_indexes(table_name, new_name, **options)
end