Methods
C
N
T
Attributes
[R] columns
[R] columns_hash
[R] connection
[R] primary_keys
[R] tables
Class Public methods
new(conn)

Source: show | on GitHub 

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 7
def initialize(conn)
  @connection = conn
  @tables     = {}

  @columns = Hash.new do |h, table_name|
    h[table_name] = conn.columns(table_name, "#{table_name} Columns")
  end

  @columns_hash = Hash.new do |h, table_name|
    h[table_name] = Hash[columns[table_name].map { |col|
      [col.name, col]
    }]
  end

  @primary_keys = Hash.new do |h, table_name|
    h[table_name] = table_exists?(table_name) ? conn.primary_key(table_name) : nil
  end
end
Instance Public methods
clear!()

Clears out internal caches

Source: show | on GitHub 

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 34
def clear!
  @columns.clear
  @columns_hash.clear
  @primary_keys.clear
  @tables.clear
end
clear_table_cache!(table_name)

Clear out internal caches for table with table_name.

Source: show | on GitHub 

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 42
def clear_table_cache!(table_name)
  @columns.delete table_name
  @columns_hash.delete table_name
  @primary_keys.delete table_name
  @tables.delete table_name
end
table_exists?(name)

A cached lookup for table existence.

Source: show | on GitHub 

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 27
def table_exists?(name)
  return @tables[name] if @tables.key? name

  @tables[name] = connection.table_exists?(name)
end