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.\" ========================================================================
.\"
.IX Title "Tangram::Type::Array::Scalar 3pm"
.TH Tangram::Type::Array::Scalar 3pm "2022-10-16" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Tangram::Type::Array::Scalar \- map Perl array of strings or numbers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&   use Tangram::Core;
\&   use Tangram::Type::Array::Scalar; # always
\&
\&   $schema = Tangram::Schema\->new(
\&      classes => { NaturalPerson => { fields => {
\&
\&      flat_array =>
\&      {
\&         interests =>
\&         {
\&            table => \*(AqNP_int\*(Aq,
\&            sql => \*(AqVARCHAR(50)\*(Aq,
\&         },
\&
\&         lucky_numbers => \*(Aqint\*(Aq, # use defaults
\&      }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Maps references to a Perl array. The persistent fields are grouped in
a hash under the \f(CW\*(C`array\*(C'\fR key in the field hash.
.PP
The array may contain only 'simple' scalars like integers, strings
or real numbers. It may not contain references. For arrays of
objects, see Tangram::Type::Array::FromMany and Tangram::Type::Array::FromOne.
.PP
Tangram uses a table to save the state of the collection. The table
has three columns, which contain
.IP "\(bu" 4
the id of the container object
.IP "\(bu" 4
the position of the element in the array
.IP "\(bu" 4
the value of the element
.PP
The field names are passed in a hash that associates a field name with
a field descriptor. The field descriptor may be either a hash or a
string. The hash uses the following fields:
.IP "\(bu" 4
type
.IP "\(bu" 4
table
.IP "\(bu" 4
sql
.PP
Optional field \f(CW\*(C`type\*(C'\fR specifies the type of the elements. If the type
is \f(CW\*(C`string\*(C'\fRTangram quotes the values as they are passed to the
database.  Not specifying a \f(CW\*(C`type\*(C'\fR is exactly equivalent to
specifying \f(CW\*(C`string\*(C'\fR.
.PP
Optional field \f(CW\*(C`table\*(C'\fR sets the name of the table that contains the
elements. This defaults to 'C_F', where C is the class of the
containing object and F is the field name.
.PP
Optional field \f(CW\*(C`sql\*(C'\fR specifies the type that \fBdeploy()\fR (see
Tangram::Deploy) should use for the column containing the
elements. If this field is not present, the \s-1SQL\s0 type is derived from
the \f(CW\*(C`type\*(C'\fR field: if \f(CW\*(C`type\*(C'\fR is \f(CW\*(C`string\*(C'\fR (or is absent) \s-1VARCHAR\s0(255)
is used; otherwise, the \f(CW\*(C`type\*(C'\fR field is interpreted as a \s-1SQL\s0 type.
.PP
If the descriptor is a string, it is interpreted as the value of the
\&\f(CW\*(C`type\*(C'\fR field and all the other fields take the default value.