class ActiveRecord::ConnectionAdapters::SchemaCache

Attributes

connection[RW]
version[R]

Public Class Methods

new(conn) click to toggle source
# File lib/active_record/connection_adapters/schema_cache.rb, line 9
def initialize(conn)
  @connection = conn

  @columns      = {}
  @columns_hash = {}
  @primary_keys = {}
  @tables       = {}
  prepare_default_proc
end

Public Instance Methods

add(table_name) click to toggle source

Add internal cache for table with table_name.

# File lib/active_record/connection_adapters/schema_cache.rb, line 36
def add(table_name)
  if table_exists?(table_name)
    @primary_keys[table_name]
    @columns[table_name]
    @columns_hash[table_name]
  end
end
clear!() click to toggle source

Clears out internal caches

# File lib/active_record/connection_adapters/schema_cache.rb, line 75
def clear!
  @columns.clear
  @columns_hash.clear
  @primary_keys.clear
  @tables.clear
  @version = nil
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 90
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 = nil) click to toggle source

Get the columns for a table

# File lib/active_record/connection_adapters/schema_cache.rb, line 54
def columns(table = nil)
  if table
    @columns[table]
  else
    ActiveSupport::Deprecation.warn('call columns with a table name!')
    @columns.dup
  end
end
columns_hash(table = nil) click to toggle source

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

# File lib/active_record/connection_adapters/schema_cache.rb, line 65
def columns_hash(table = nil)
  if table
    @columns_hash[table]
  else
    ActiveSupport::Deprecation.warn('call columns_hash with a table name!')
    @columns_hash.dup
  end
end
marshal_dump() click to toggle source
# File lib/active_record/connection_adapters/schema_cache.rb, line 97
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].map { |val|
    Hash[val]
  }
end
marshal_load(array) click to toggle source
# File lib/active_record/connection_adapters/schema_cache.rb, line 105
def marshal_load(array)
  @version, @columns, @columns_hash, @primary_keys, @tables = array
  prepare_default_proc
end
primary_keys(table_name = nil) click to toggle source
# File lib/active_record/connection_adapters/schema_cache.rb, line 19
def primary_keys(table_name = nil)
  if table_name
    @primary_keys[table_name]
  else
    ActiveSupport::Deprecation.warn('call primary_keys with a table name!')
    @primary_keys.dup
  end
end
size() click to toggle source
# File lib/active_record/connection_adapters/schema_cache.rb, line 83
def size
  [@columns, @columns_hash, @primary_keys, @tables].map { |x|
    x.size
  }.inject :+
end
table_exists?(name) click to toggle source

A cached lookup for table existence.

# File lib/active_record/connection_adapters/schema_cache.rb, line 29
def table_exists?(name)
  return @tables[name] if @tables.key? name

  @tables[name] = connection.table_exists?(name)
end
tables(name = nil) click to toggle source
# File lib/active_record/connection_adapters/schema_cache.rb, line 44
def tables(name = nil)
  if name
    @tables[name]
  else
    ActiveSupport::Deprecation.warn('call tables with a name!')
    @tables.dup
  end
end

Private Instance Methods

prepare_default_proc() click to toggle source
# File lib/active_record/connection_adapters/schema_cache.rb, line 112
def prepare_default_proc
  @columns.default_proc = Proc.new do |h, table_name|
    h[table_name] = connection.columns(table_name)
  end

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

  @primary_keys.default_proc = Proc.new do |h, table_name|
    h[table_name] = table_exists?(table_name) ? connection.primary_key(table_name) : nil
  end
end