Alex Vandiver

NAME

Jifty::DBI::Column - Encapsulates a single column in a Jifty::DBI::Record table

DESCRIPTION

This class encapsulates a single column in a Jifty::DBI::Record table description. It replaces the _accessible method in Jifty::DBI::Record.

It has the following accessors: name type default validator boolean refers_to readable writable length.

new

is_numeric

Returns true if the column is of some numeric type, otherwise returns false.

is_string

Returns true if this column is a text field

is_boolean

Returns true if this column is a boolean

serialize_metadata

Returns a hash describing this column object with enough detail to fully describe it in the database. Intentionally skips record_class, all column attributes starting with _, and all column attributes which are undefined. The "known" attributes in the attributes hash are flattened and returned as well. The list of known attributes are:

container
label hints render_as
display_length
valid_values
available_values
autocompleted
documentation
no_placeholder

Setting this to a true value causes "load_by_cols" in Jifty::DBI::record to not use a placeholder when loading the column. This can allow the database to come up with better query plans in some cases.

serialize_metadata2

Returns a hash describing this column object with enough detail to fully describe it in the database. Intentionally skips record_class, all column attributes starting with _, and all column attributes which are undefined.

validator

Gets/sets the validator coderef for the column.

read

DEPRECATED. Use $column->readable instead.

write

DEPRECATED. Use $column->writable instead.

length

DEPRECATED. Use $column->max_length instead.

until

DEPRECATED. Use $column->till instead.

active

Returns the a true value if the column method exists for the current application version. The current application version is determined by checking the "schema_version" in Jifty::DBI::Record of the column's "record_class". This method returns a false value if the column is not yet been added or has been dropped.

This method returns a false value under these circumstances:

  • Both the since trait and schema_version method are defined and schema_version is less than the version set on since.

  • Both the till trait and schema_version method are defined and schema_version is greater than or equal to the version set on till.

Otherwise, this method returns true.