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Methods
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Attributes
[RW] connection
[R] version
Class Public methods
new(conn)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 7
def initialize(conn)
  @connection = conn

  @columns      = {}
  @columns_hash = {}
  @primary_keys = {}
  @tables       = {}
end
Instance Public methods
add(table_name)

Add internal cache for table with table_name.

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 29
def add(table_name)
  if table_exists?(table_name)
    primary_keys(table_name)
    columns(table_name)
    columns_hash(table_name)
  end
end
clear!()

Clears out internal caches

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 55
def clear!
  @columns.clear
  @columns_hash.clear
  @primary_keys.clear
  @tables.clear
  @version = nil
end
clear_table_cache!(table_name)

Clear out internal caches for table with table_name.

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 68
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
columns(table_name)

Get the columns for a table

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 42
def columns(table_name)
  @columns[table_name] ||= connection.columns(table_name)
end
columns_hash(table_name)

Get the columns for a table as a hash, key is the column name value is the column object.

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 48
def columns_hash(table_name)
  @columns_hash[table_name] ||= Hash[columns(table_name).map { |col|
    [col.name, col]
  }]
end
marshal_dump()
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 75
def marshal_dump
  # if we get current version during initialization, it happens stack over flow.
  @version = ActiveRecord::Migrator.current_version
  [@version, @columns, @columns_hash, @primary_keys, @tables]
end
marshal_load(array)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 81
def marshal_load(array)
  @version, @columns, @columns_hash, @primary_keys, @tables = array
end
primary_keys(table_name)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 16
def primary_keys(table_name)
  @primary_keys[table_name] ||= table_exists?(table_name) ? connection.primary_key(table_name) : nil
end
size()
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 63
def size
  [@columns, @columns_hash, @primary_keys, @tables].map(&:size).inject :+
end
table_exists?(name)

A cached lookup for table existence.

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 21
def table_exists?(name)
  prepare_tables if @tables.empty?
  return @tables[name] if @tables.key? name

  @tables[name] = connection.table_exists?(name)
end
tables(name)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 37
def tables(name)
  @tables[name]
end