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ActiveRecord::ConnectionAdapters::SchemaCache

Attributes

columns[R]
columns_hash[R]
connection[R]
primary_keys[R]
tables[R]

Public Class Methods

new(conn) click to toggle source
# File 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

Public Instance Methods

clear!() click to toggle source

Clears out internal caches

# File 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) click to toggle source

Clear out internal caches for table with table_name.

# File 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) click to toggle source

A cached lookup for table existence.

# File 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

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