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.IX Title "Jifty::DBI::Column 3pm"
.TH Jifty::DBI::Column 3pm "2012-01-26" "perl v5.18.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Jifty::DBI::Column \- Encapsulates a single column in a Jifty::DBI::Record table
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class encapsulates a single column in a Jifty::DBI::Record table
description. It replaces the _accessible method in
Jifty::DBI::Record.
.PP
It has the following accessors: \f(CW\*(C`name type default validator boolean
refers_to readable writable length\*(C'\fR.
.SS "new"
.IX Subsection "new"
.SS "is_numeric"
.IX Subsection "is_numeric"
Returns true if the column is of some numeric type, otherwise returns false.
.SS "is_string"
.IX Subsection "is_string"
Returns true if this column is a text field
.SS "is_boolean"
.IX Subsection "is_boolean"
Returns true if this column is a boolean
.SS "serialize_metadata"
.IX Subsection "serialize_metadata"
Returns a hash describing this column object with enough detail to
fully describe it in the database.  Intentionally skips
\&\f(CW\*(C`record_class\*(C'\fR, all column attributes starting with \f(CW\*(C`_\*(C'\fR, and all
column attributes which are undefined.  The \*(L"known\*(R" attributes in the
\&\f(CW\*(C`attributes\*(C'\fR hash are flattened and returned as well.  The list of
known attributes are:
.IP "container" 4
.IX Item "container"
.PD 0
.IP "label hints render_as" 4
.IX Item "label hints render_as"
.IP "display_length" 4
.IX Item "display_length"
.IP "valid_values" 4
.IX Item "valid_values"
.IP "available_values" 4
.IX Item "available_values"
.IP "autocompleted" 4
.IX Item "autocompleted"
.IP "documentation" 4
.IX Item "documentation"
.IP "no_placeholder" 4
.IX Item "no_placeholder"
.PD
Setting this to a true value causes \*(L"load_by_cols\*(R" 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.
.SS "serialize_metadata2"
.IX Subsection "serialize_metadata2"
Returns a hash describing this column object with enough detail to
fully describe it in the database.  Intentionally skips \f(CW\*(C`record_class\*(C'\fR,
all column attributes starting with \f(CW\*(C`_\*(C'\fR, and all column attributes
which are undefined.
.SS "validator"
.IX Subsection "validator"
Gets/sets the validator coderef for the column.
.SS "read"
.IX Subsection "read"
\&\s-1DEPRECATED. \s0 Use \f(CW\*(C`$column\->readable\*(C'\fR instead.
.SS "write"
.IX Subsection "write"
\&\s-1DEPRECATED. \s0 Use \f(CW\*(C`$column\->writable\*(C'\fR instead.
.SS "length"
.IX Subsection "length"
\&\s-1DEPRECATED. \s0 Use \f(CW\*(C`$column\->max_length\*(C'\fR instead.
.SS "until"
.IX Subsection "until"
\&\s-1DEPRECATED. \s0 Use \f(CW\*(C`$column\->till\*(C'\fR instead.
.SS "active"
.IX Subsection "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 \*(L"schema_version\*(R" in Jifty::DBI::Record of the column's \*(L"record_class\*(R". This method returns a false value if the column is not yet been added or has been dropped.
.PP
This method returns a false value under these circumstances:
.IP "\(bu" 4
Both the \f(CW\*(C`since\*(C'\fR trait and \f(CW\*(C`schema_version\*(C'\fR method are defined and \f(CW\*(C`schema_version\*(C'\fR is less than the version set on \f(CW\*(C`since\*(C'\fR.
.IP "\(bu" 4
Both the \f(CW\*(C`till\*(C'\fR trait and \f(CW\*(C`schema_version\*(C'\fR method are defined and \f(CW\*(C`schema_version\*(C'\fR is greater than or equal to the version set on \f(CW\*(C`till\*(C'\fR.
.PP
Otherwise, this method returns true.