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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 9
def initialize(conn)
  @connection = conn

  @columns      = {}
  @columns_hash = {}
  @primary_keys = {}
  @data_sources = {}
  @indexes      = {}
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 61
def add(table_name)
  if data_source_exists?(table_name)
    primary_keys(table_name)
    columns(table_name)
    columns_hash(table_name)
    indexes(table_name)
  end
end
clear!()

Clears out internal caches

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 99
def clear!
  @columns.clear
  @columns_hash.clear
  @primary_keys.clear
  @data_sources.clear
  @indexes.clear
  @version = nil
  @database_version = nil
end
clear_data_source_cache!(name)

Clear out internal caches for the data source name.

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 114
def clear_data_source_cache!(name)
  @columns.delete name
  @columns_hash.delete name
  @primary_keys.delete name
  @data_sources.delete name
  @indexes.delete name
end
columns(table_name)

Get the columns for a table

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 75
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 81
def columns_hash(table_name)
  @columns_hash[table_name] ||= columns(table_name).index_by(&:name)
end
columns_hash?(table_name)

Checks whether the columns hash is already cached for a table.

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 86
def columns_hash?(table_name)
  @columns_hash.key?(table_name)
end
data_source_exists?(name)

A cached lookup for table existence.

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 53
def data_source_exists?(name)
  prepare_data_sources if @data_sources.empty?
  return @data_sources[name] if @data_sources.key? name

  @data_sources[name] = connection.data_source_exists?(name)
end
data_sources(name)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 70
def data_sources(name)
  @data_sources[name]
end
encode_with(coder)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 28
def encode_with(coder)
  coder["columns"]          = @columns
  coder["primary_keys"]     = @primary_keys
  coder["data_sources"]     = @data_sources
  coder["indexes"]          = @indexes
  coder["version"]          = connection.migration_context.current_version
  coder["database_version"] = database_version
end
indexes(table_name)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 90
def indexes(table_name)
  @indexes[table_name] ||= connection.indexes(table_name)
end
init_with(coder)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 37
def init_with(coder)
  @columns          = coder["columns"]
  @primary_keys     = coder["primary_keys"]
  @data_sources     = coder["data_sources"]
  @indexes          = coder["indexes"] || {}
  @version          = coder["version"]
  @database_version = coder["database_version"]

  derive_columns_hash_and_deduplicate_values
end
initialize_dup(other)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 19
def initialize_dup(other)
  super
  @columns      = @columns.dup
  @columns_hash = @columns_hash.dup
  @primary_keys = @primary_keys.dup
  @data_sources = @data_sources.dup
  @indexes      = @indexes.dup
end
marshal_dump()
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 122
def marshal_dump
  # if we get current version during initialization, it happens stack over flow.
  @version = connection.migration_context.current_version
  [@version, @columns, {}, @primary_keys, @data_sources, @indexes, database_version]
end
marshal_load(array)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 128
def marshal_load(array)
  @version, @columns, _columns_hash, @primary_keys, @data_sources, @indexes, @database_version = array
  @indexes ||= {}

  derive_columns_hash_and_deduplicate_values
end
primary_keys(table_name)
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 48
def primary_keys(table_name)
  @primary_keys[table_name] ||= data_source_exists?(table_name) ? connection.primary_key(table_name) : nil
end
size()
# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 109
def size
  [@columns, @columns_hash, @primary_keys, @data_sources].sum(&:size)
end