[dbsrgits/SQL-Translator.git] / lib / SQL / Translator / Producer / ClassDBI.pm

package SQL::Translator::Producer::ClassDBI;

# -------------------------------------------------------------------
# $Id: ClassDBI.pm,v 1.44 2005-11-17 21:55:41 mwz444 Exp $
# -------------------------------------------------------------------
# Copyright (C) 2002-4 SQLFairy Authors
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307  USA
# -------------------------------------------------------------------

use strict;
use vars qw[ $VERSION $DEBUG ];
$VERSION = sprintf "%d.%02d", q$Revision: 1.44 $ =~ /(\d+)\.(\d+)/;
$DEBUG = 1 unless defined $DEBUG;

use SQL::Translator::Schema::Constants;
use SQL::Translator::Utils qw(debug header_comment);
use Data::Dumper;

my %CDBI_auto_pkgs = (
    MySQL      => 'mysql',
    PostgreSQL => 'Pg',
    Oracle     => 'Oracle',
);

# -------------------------------------------------------------------
sub produce {
    my $t      = shift;
    my $create = undef;
    local $DEBUG = $t->debug;
    my $no_comments   = $t->no_comments;
    my $schema        = $t->schema;
    my $args          = $t->producer_args;
    if ( my $fmt = $args->{'format_pkg_name'} ) {
        $t->format_package_name( $fmt );
    }
    if ( my $fmt = $args->{'format_fk_name'} ) {
        $t->format_fk_name( $fmt );
    }
    my $db_user       = $args->{'db_user'} || '';
    my $db_pass       = $args->{'db_password'} || '';
    my $main_pkg_name = $args->{'package_name'} ||
                        # $args->{'main_pkg_name'} || # keep this? undocumented
                        $t->format_package_name('DBI');
    my $header        = header_comment( __PACKAGE__, "# " );
    my $parser_type   = ( split /::/, $t->parser_type )[-1];
    my $from          = $CDBI_auto_pkgs{$parser_type} || '';
    my $dsn           = $args->{'dsn'} || sprintf( 'dbi:%s:_', 
        $CDBI_auto_pkgs{ $parser_type } 
        ? $CDBI_auto_pkgs{ $parser_type } : $parser_type 
    );
    my $sep           = '# ' . '-' x 67;


    #
    # Identify "link tables" (have only PK and FK fields).
    #
    my %linkable;
    my %linktable;
    for my $table ( $schema->get_tables ) {
        debug("PKG: Table = ", $table->name, "\n");
        my $is_link = 1;
        for my $field ( $table->get_fields ) {
            unless ( $field->is_primary_key or $field->is_foreign_key ) {
                $is_link = 0;
                last;
            }
        }

        next unless $is_link;

        foreach my $left ( $table->get_fields ) {
            next unless $left->is_foreign_key;
            my $lfk = $left->foreign_key_reference or next;
            my $lr_table = $schema->get_table( $lfk->reference_table )
              or next;
            my $lr_field_name = ( $lfk->reference_fields )[0];
            my $lr_field      = $lr_table->get_field($lr_field_name);
            next unless $lr_field->is_primary_key;

            foreach my $right ( $table->get_fields ) {
                next if $left->name eq $right->name;

                my $rfk = $right->foreign_key_reference or next;
                my $rr_table = $schema->get_table( $rfk->reference_table )
                  or next;
                my $rr_field_name = ( $rfk->reference_fields )[0];
                my $rr_field      = $rr_table->get_field($rr_field_name);
                next unless $rr_field->is_primary_key;

                $linkable{ $lr_table->name }{ $rr_table->name } = $table;
                $linkable{ $rr_table->name }{ $lr_table->name } = $table;
                $linktable{ $table->name } = $table;
            }
        }
    }

    #
    # Iterate over all tables
    #
    my ( %packages, $order );
    for my $table ( $schema->get_tables ) {
        my $table_name = $table->name or next;

        my $table_pkg_name = join '::', $main_pkg_name, $t->format_package_name($table_name);
        $packages{ $table_pkg_name } = {
            order    => ++$order,
            pkg_name => $table_pkg_name,
            base     => $main_pkg_name,
            table    => $table_name,
        };

        #
        # Primary key may have a differenct accessor method name
        #
#        if ( my $constraint = $table->primary_key ) {
#            my $field = ( $constraint->fields )[0];
#            $packages{ $table_pkg_name }{'_columns_primary'} = $field;
#
#            if ( my $pk_xform = $t->format_pk_name ) {
#                my $pk_name = $pk_xform->( $table_pkg_name, $field );
#
#                $packages{$table_pkg_name}{'pk_accessor'} =
#                  "#\n# Primary key accessor\n#\n"
#                  . "sub $pk_name {\n    shift->$field\n}\n\n";
#            }
#        }

        my $is_data = 0;
        foreach my $field ( $table->get_fields ) {
            if ( !$field->is_foreign_key and !$field->is_primary_key ) {
                push @{ $packages{$table_pkg_name}{'_columns_essential'} },
                  $field->name;
                $is_data++;
            }
            elsif ( !$field->is_primary_key ) {
                push @{ $packages{$table_pkg_name}{'_columns_others'} },
                  $field->name;
            }
        }

        my %linked;
        if ($is_data) {
            foreach my $link ( keys %{ $linkable{$table_name} } ) {
                my $linkmethodname;

                if ( my $fk_xform = $t->format_fk_name ) {

                    # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
                    $linkmethodname = $fk_xform->(
                        $linkable{ $table_name }{ $link }->name,
                        ( $schema->get_table( $link )->primary_key->fields )[0]
                      )
                      . 's';
                }
                else {
                    # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
                    $linkmethodname =
                      $linkable{ $table_name }{ $link }->name . '_'
                      . ( $schema->get_table( $link )->primary_key->fields )[0]
                      . 's';
                }

                my @rk_fields = ();
                my @lk_fields = ();
                foreach my $field ( $linkable{$table_name}{$link}->get_fields )
                {
                    next unless $field->is_foreign_key;

                    next unless ( 
                        $field->foreign_key_reference->reference_table eq
                           $table_name
                        || 
                        $field->foreign_key_reference->reference_table eq $link 
                    );

                    push @lk_fields,
                      ( $field->foreign_key_reference->reference_fields )[0]
                      if $field->foreign_key_reference->reference_table eq
                      $link;

                    push @rk_fields, $field->name
                      if $field->foreign_key_reference->reference_table eq
                      $table_name;
                }

                #
                # If one possible traversal via link table.
                #
                if ( scalar(@rk_fields) == 1 and scalar(@lk_fields) == 1 ) {
                    foreach my $rk_field (@rk_fields) {
                        push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
                          "sub "
                          . $linkmethodname
                          . " { my \$self = shift; "
                          . "return map \$_->"
                          . ( $schema->get_table($link)->primary_key->fields )
                          [0]
                          . ", \$self->"
                          . $linkable{$table_name}{$link}->name . "_"
                          . $rk_field
                          . " }\n\n";
                    }

                    #
                    # Else there is more than one way to traverse it.
                    # ack!  Let's treat these types of link tables as
                    # a many-to-one (easier)
                    #
                    # NOTE: we need to rethink the link method name,
                    # as the cardinality has shifted on us.
                    #
                }
                elsif ( scalar(@rk_fields) == 1 ) {
                    foreach my $rk_field (@rk_fields) {
                        #
                        # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
                        #
                        push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
                          "sub "
                          . $linkable{$table_name}{$link}->name
                          . "s { my \$self = shift; return \$self->"
                          . $linkable{$table_name}{$link}->name . "_"
                          . $rk_field
                          . "(\@_) }\n\n";
                    }
                }
                elsif ( scalar(@lk_fields) == 1 ) {
                    #
                    # These will be taken care of on the other end...
                    #
                }
                else {
                    #
                    # Many many many.  Need multiple iterations here,
                    # data structure revision to handle N FK sources.
                    # This code has not been tested and likely doesn't
                    # work here.
                    #
                    foreach my $rk_field (@rk_fields) {
                        # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
                        push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
                          "sub "
                          . $linkable{$table_name}{$link}->name . "_"
                          . $rk_field
                          . "s { my \$self = shift; return \$self->"
                          . $linkable{$table_name}{$link}->name . "_"
                          . $rk_field
                          . "(\@_) }\n\n";
                    }
                }
            }
        }

        #
        # Use foreign keys to set up "has_a/has_many" relationships.
        #
        foreach my $field ( $table->get_fields ) {
            if ( $field->is_foreign_key ) {
                my $table_name = $table->name;
                my $field_name = $field->name;
#                my $fk_method  = $t->format_fk_name( $table_name, $field_name );
                my $fk_method  = join('::', $table_pkg_name, 
                    $t->format_fk_name( $table_name, $field_name )
                );
                my $fk         = $field->foreign_key_reference;
                my $ref_table  = $fk->reference_table;
                my $ref_pkg    = $t->format_package_name($ref_table);
                my $ref_field  = ( $fk->reference_fields )[0];
#                my $fk_method  = join('::',
#                    $table_pkg_name, $t->format_fk_name( $ref_table )
#                );

                push @{ $packages{$table_pkg_name}{'has_a'} },
                  "$table_pkg_name->has_a(\n"
                  . "    $field_name => '$ref_pkg'\n);\n\n"
                  . "sub $fk_method {\n"
                  . "    return shift->$field_name\n}\n\n"
                ;

                # if there weren't M-M relationships via the has_many
                # being set up here, create nice pluralized method alias
                # rather for user as alt. to ugly tablename_fieldname name
                #
#                if ( !$packages{$ref_pkg}{'has_many'}{$table_name} ) {
#                    #
#                    # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
#                    #
#                    push @{ $packages{$ref_pkg}{'has_many'}{$table_name} },
#                        "sub ${table_name}s {\n    " .
#                        "return shift->$table_name\_$field_name\n}\n\n";
#                    # else ugly
#                }
#                else {
#                }

                push @{ $packages{$ref_pkg}{'has_many'}{$table_name} },
                  "$ref_pkg->has_many(\n    '${table_name}_${field_name}', "
                  . "'$table_pkg_name' => '$field_name'\n);\n\n";

            }
        }
    }

    #
    # Now build up text of package.
    #
    my $base_pkg = sprintf( 'Class::DBI%s', $from ? "::$from" : '' );
    $create .= join ( "\n",
        "package $main_pkg_name;\n",
        $header,
        "use strict;",
        "use base '$base_pkg';\n",
        "$main_pkg_name->set_db('Main', '$dsn', '$db_user', '$db_pass');\n\n",
    );

    for my $pkg_name (
        sort { $packages{ $a }{'order'} <=> $packages{ $b }{'order'} }
        keys %packages
    ) {
        my $pkg = $packages{$pkg_name} or next;
        next unless $pkg->{'pkg_name'};

        $create .= join ( "\n",
            $sep,
            "package " . $pkg->{'pkg_name'} . ";",
            "use base '" . $pkg->{'base'} . "';",
            "use Class::DBI::Pager;\n\n",
        );

                if ( $from ) {
                    $create .= 
                        $pkg->{'pkg_name'}."->set_up_table('".$pkg->{'table'}."');\n\n";
                }
                else {
                    my $table       = $schema->get_table( $pkg->{'table'} );
                    my @field_names = map { $_->name } $table->get_fields;
					
                    $create .= join("\n",
                        $pkg_name."->table('".$pkg->{'table'}."');\n",
                        $pkg_name."->columns(All => qw/".
                        join(' ', @field_names)."/);\n\n",
                    );
                }

        $create .= "\n";

        if ( my $pk = $pkg->{'pk_accessor'} ) {
            $create .= $pk;
        }

        if ( my @has_a = @{ $pkg->{'has_a'} || [] } ) {
            $create .= $_ for @has_a;
        }

        foreach my $has_many_key ( keys %{ $pkg->{'has_many'} } ) {
            if ( my @has_many = @{ $pkg->{'has_many'}{$has_many_key} || [] } ) {
                $create .= $_ for @has_many;
            }
        }
    }

    $create .= "1;\n";

    return $create;
}

1;

# -------------------------------------------------------------------

=pod

=head1 NAME

SQL::Translator::Producer::ClassDBI - create Class::DBI classes from schema

=head1 SYNOPSIS

Use this producer as you would any other from SQL::Translator.  See
L<SQL::Translator> for details.

This package utilizes SQL::Translator's formatting methods
format_package_name(), format_pk_name(), format_fk_name(), and
format_table_name() as it creates classes, one per table in the schema
provided.  An additional base class is also created for database connectivity
configuration.  See L<Class::DBI> for details on how this works.

=head1 AUTHORS

Allen Day E<lt>allenday@ucla.eduE<gt>,
Ying Zhang E<lt>zyolive@yahoo.comE<gt>,
Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
Commit	Line	Data
f42e7027	1	package SQL::Translator::Producer::ClassDBI;
	2
	3	# -------------------------------------------------------------------
4330d04e	4	# $Id: ClassDBI.pm,v 1.44 2005-11-17 21:55:41 mwz444 Exp $
f42e7027	5	# -------------------------------------------------------------------
977651a5	6	# Copyright (C) 2002-4 SQLFairy Authors
f42e7027	7	#
	8	# This program is free software; you can redistribute it and/or
	9	# modify it under the terms of the GNU General Public License as
	10	# published by the Free Software Foundation; version 2.
	11	#
	12	# This program is distributed in the hope that it will be useful, but
	13	# WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	# General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; if not, write to the Free Software
	19	# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	20	# 02111-1307 USA
	21	# -------------------------------------------------------------------
	22
	23	use strict;
	24	use vars qw[ $VERSION $DEBUG ];
4330d04e	25	$VERSION = sprintf "%d.%02d", q$Revision: 1.44 $ =~ /(\d+)\.(\d+)/;
41a7b982	26	$DEBUG = 1 unless defined $DEBUG;
f42e7027	27
6c45056f	28	use SQL::Translator::Schema::Constants;
73892176	29	use SQL::Translator::Utils qw(debug header_comment);
71046f4b	30	use Data::Dumper;
f42e7027	31
bf4629e7	32	my %CDBI_auto_pkgs = (
71046f4b	33	MySQL => 'mysql',
	34	PostgreSQL => 'Pg',
	35	Oracle => 'Oracle',
bf4629e7	36	);
	37
	38	# -------------------------------------------------------------------
f42e7027	39	sub produce {
41a7b982	40	my $t = shift;
	41	my $create = undef;
	42	local $DEBUG = $t->debug;
390292d3	43	my $no_comments = $t->no_comments;
	44	my $schema = $t->schema;
	45	my $args = $t->producer_args;
73892176	46	if ( my $fmt = $args->{'format_pkg_name'} ) {
	47	$t->format_package_name( $fmt );
	48	}
	49	if ( my $fmt = $args->{'format_fk_name'} ) {
	50	$t->format_fk_name( $fmt );
	51	}
bf4629e7	52	my $db_user = $args->{'db_user'} \|\| '';
4330d04e	53	my $db_pass = $args->{'db_password'} \|\| '';
	54	my $main_pkg_name = $args->{'package_name'} \|\|
	55	# $args->{'main_pkg_name'} \|\| # keep this? undocumented
41a7b982	56	$t->format_package_name('DBI');
41a7b982	57	my $header = header_comment( __PACKAGE__, "# " );
390292d3	58	my $parser_type = ( split /::/, $t->parser_type )[-1];
41a7b982	59	my $from = $CDBI_auto_pkgs{$parser_type} \|\| '';
	60	my $dsn = $args->{'dsn'} \|\| sprintf( 'dbi:%s:_',
	61	$CDBI_auto_pkgs{ $parser_type }
	62	? $CDBI_auto_pkgs{ $parser_type } : $parser_type
	63	);
71046f4b	64	my $sep = '# ' . '-' x 67;
fe77d758	65
73892176	66
fe77d758	67	#
	68	# Identify "link tables" (have only PK and FK fields).
	69	#
	70	my %linkable;
	71	my %linktable;
73892176	72	for my $table ( $schema->get_tables ) {
73892176	73	debug("PKG: Table = ", $table->name, "\n");
fe77d758	74	my $is_link = 1;
73892176	75	for my $field ( $table->get_fields ) {
fe77d758	76	unless ( $field->is_primary_key or $field->is_foreign_key ) {
41a7b982	77	$is_link = 0;
fe77d758	78	last;
	79	}
	80	}
	81
	82	next unless $is_link;
41a7b982	83
fe77d758	84	foreach my $left ( $table->get_fields ) {
fe77d758	85	next unless $left->is_foreign_key;
41a7b982	86	my $lfk = $left->foreign_key_reference or next;
	87	my $lr_table = $schema->get_table( $lfk->reference_table )
	88	or next;
	89	my $lr_field_name = ( $lfk->reference_fields )[0];
fe77d758	90	my $lr_field = $lr_table->get_field($lr_field_name);
	91	next unless $lr_field->is_primary_key;
	92
	93	foreach my $right ( $table->get_fields ) {
	94	next if $left->name eq $right->name;
41a7b982	95
41a7b982	96	my $rfk = $right->foreign_key_reference or next;
fe77d758	97	my $rr_table = $schema->get_table( $rfk->reference_table )
41a7b982	98	or next;
41a7b982	99	my $rr_field_name = ( $rfk->reference_fields )[0];
fe77d758	100	my $rr_field = $rr_table->get_field($rr_field_name);
fe77d758	101	next unless $rr_field->is_primary_key;
41a7b982	102
c703e51d	103	$linkable{ $lr_table->name }{ $rr_table->name } = $table;
c703e51d	104	$linkable{ $rr_table->name }{ $lr_table->name } = $table;
fe77d758	105	$linktable{ $table->name } = $table;
	106	}
	107	}
	108	}
c703e51d	109
6c45056f	110	#
71046f4b	111	# Iterate over all tables
6c45056f	112	#
bf4629e7	113	my ( %packages, $order );
6c45056f	114	for my $table ( $schema->get_tables ) {
6c45056f	115	my $table_name = $table->name or next;
6c45056f	116
4330d04e	117	my $table_pkg_name = join '::', $main_pkg_name, $t->format_package_name($table_name);
73892176	118	$packages{ $table_pkg_name } = {
41a7b982	119	order => ++$order,
	120	pkg_name => $table_pkg_name,
	121	base => $main_pkg_name,
	122	table => $table_name,
bf4629e7	123	};
6c45056f	124
6c45056f	125	#
bf4629e7	126	# Primary key may have a differenct accessor method name
6c45056f	127	#
73892176	128	# if ( my $constraint = $table->primary_key ) {
	129	# my $field = ( $constraint->fields )[0];
	130	# $packages{ $table_pkg_name }{'_columns_primary'} = $field;
	131	#
	132	# if ( my $pk_xform = $t->format_pk_name ) {
	133	# my $pk_name = $pk_xform->( $table_pkg_name, $field );
	134	#
	135	# $packages{$table_pkg_name}{'pk_accessor'} =
	136	# "#\n# Primary key accessor\n#\n"
	137	# . "sub $pk_name {\n shift->$field\n}\n\n";
	138	# }
	139	# }
d79af833	140
	141	my $is_data = 0;
	142	foreach my $field ( $table->get_fields ) {
41a7b982	143	if ( !$field->is_foreign_key and !$field->is_primary_key ) {
	144	push @{ $packages{$table_pkg_name}{'_columns_essential'} },
	145	$field->name;
	146	$is_data++;
	147	}
	148	elsif ( !$field->is_primary_key ) {
	149	push @{ $packages{$table_pkg_name}{'_columns_others'} },
	150	$field->name;
	151	}
d79af833	152	}
d79af833	153
41a7b982	154	my %linked;
	155	if ($is_data) {
	156	foreach my $link ( keys %{ $linkable{$table_name} } ) {
	157	my $linkmethodname;
	158
	159	if ( my $fk_xform = $t->format_fk_name ) {
	160
	161	# ADD CALLBACK FOR PLURALIZATION MANGLING HERE
	162	$linkmethodname = $fk_xform->(
	163	$linkable{ $table_name }{ $link }->name,
	164	( $schema->get_table( $link )->primary_key->fields )[0]
	165	)
	166	. 's';
	167	}
	168	else {
	169	# ADD CALLBACK FOR PLURALIZATION MANGLING HERE
	170	$linkmethodname =
	171	$linkable{ $table_name }{ $link }->name . '_'
	172	. ( $schema->get_table( $link )->primary_key->fields )[0]
	173	. 's';
	174	}
	175
	176	my @rk_fields = ();
	177	my @lk_fields = ();
	178	foreach my $field ( $linkable{$table_name}{$link}->get_fields )
	179	{
	180	next unless $field->is_foreign_key;
	181
	182	next unless (
	183	$field->foreign_key_reference->reference_table eq
	184	$table_name
	185	\|\|
	186	$field->foreign_key_reference->reference_table eq $link
	187	);
	188
	189	push @lk_fields,
	190	( $field->foreign_key_reference->reference_fields )[0]
	191	if $field->foreign_key_reference->reference_table eq
	192	$link;
	193
	194	push @rk_fields, $field->name
	195	if $field->foreign_key_reference->reference_table eq
	196	$table_name;
	197	}
	198
	199	#
	200	# If one possible traversal via link table.
	201	#
	202	if ( scalar(@rk_fields) == 1 and scalar(@lk_fields) == 1 ) {
	203	foreach my $rk_field (@rk_fields) {
	204	push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
	205	"sub "
	206	. $linkmethodname
	207	. " { my \$self = shift; "
	208	. "return map \$_->"
	209	. ( $schema->get_table($link)->primary_key->fields )
	210	[0]
	211	. ", \$self->"
	212	. $linkable{$table_name}{$link}->name . "_"
	213	. $rk_field
	214	. " }\n\n";
	215	}
	216
	217	#
218	# Else there is more than one way to traverse it.
219	# ack! Let's treat these types of link tables as
220	# a many-to-one (easier)
221	#
222	# NOTE: we need to rethink the link method name,
223	# as the cardinality has shifted on us.
224	#
225	}
226	elsif ( scalar(@rk_fields) == 1 ) {
227	foreach my $rk_field (@rk_fields) {
228	#
229	# ADD CALLBACK FOR PLURALIZATION MANGLING HERE
230	#
231	push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
232	"sub "
233	. $linkable{$table_name}{$link}->name
234	. "s { my \$self = shift; return \$self->"
235	. $linkable{$table_name}{$link}->name . "_"
236	. $rk_field
237	. "(\@_) }\n\n";
238	}
239	}
240	elsif ( scalar(@lk_fields) == 1 ) {
241	#
242	# These will be taken care of on the other end...
243	#
244	}
245	else {
246	#
247	# Many many many. Need multiple iterations here,
248	# data structure revision to handle N FK sources.
249	# This code has not been tested and likely doesn't
250	# work here.
251	#
252	foreach my $rk_field (@rk_fields) {
253	# ADD CALLBACK FOR PLURALIZATION MANGLING HERE
254	push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
255	"sub "
256	. $linkable{$table_name}{$link}->name . "_"
257	. $rk_field
258	. "s { my \$self = shift; return \$self->"
259	. $linkable{$table_name}{$link}->name . "_"
260	. $rk_field
261	. "(\@_) }\n\n";
262	}
263	}
264	}
265	}
d79af833	266
6c45056f	267	#
bf4629e7	268	# Use foreign keys to set up "has_a/has_many" relationships.
6c45056f	269	#
	270	foreach my $field ( $table->get_fields ) {
	271	if ( $field->is_foreign_key ) {
bf4629e7	272	my $table_name = $table->name;
6c45056f	273	my $field_name = $field->name;
73892176	274	# my $fk_method = $t->format_fk_name( $table_name, $field_name );
	275	my $fk_method = join('::', $table_pkg_name,
	276	$t->format_fk_name( $table_name, $field_name )
	277	);
6c45056f	278	my $fk = $field->foreign_key_reference;
6c45056f	279	my $ref_table = $fk->reference_table;
f7cde540	280	my $ref_pkg = $t->format_package_name($ref_table);
41a7b982	281	my $ref_field = ( $fk->reference_fields )[0];
73892176	282	# my $fk_method = join('::',
	283	# $table_pkg_name, $t->format_fk_name( $ref_table )
	284	# );
6c45056f	285
41a7b982	286	push @{ $packages{$table_pkg_name}{'has_a'} },
	287	"$table_pkg_name->has_a(\n"
	288	. " $field_name => '$ref_pkg'\n);\n\n"
	289	. "sub $fk_method {\n"
73892176	290	. " return shift->$field_name\n}\n\n"
73892176	291	;
52fbac6a	292
41a7b982	293	# if there weren't M-M relationships via the has_many
	294	# being set up here, create nice pluralized method alias
	295	# rather for user as alt. to ugly tablename_fieldname name
	296	#
73892176	297	# if ( !$packages{$ref_pkg}{'has_many'}{$table_name} ) {
	298	# #
	299	# # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
	300	# #
	301	# push @{ $packages{$ref_pkg}{'has_many'}{$table_name} },
	302	# "sub ${table_name}s {\n " .
	303	# "return shift->$table_name\_$field_name\n}\n\n";
	304	# # else ugly
	305	# }
	306	# else {
	307	# }
41a7b982	308
	309	push @{ $packages{$ref_pkg}{'has_many'}{$table_name} },
	310	"$ref_pkg->has_many(\n '${table_name}_${field_name}', "
	311	. "'$table_pkg_name' => '$field_name'\n);\n\n";
71046f4b	312
fe77d758	313	}
41a7b982	314	}
41a7b982	315	}
6c45056f	316
fe77d758	317	#
	318	# Now build up text of package.
	319	#
bf4629e7	320	my $base_pkg = sprintf( 'Class::DBI%s', $from ? "::$from" : '' );
41a7b982	321	$create .= join ( "\n",
	322	"package $main_pkg_name;\n",
	323	$header,
	324	"use strict;",
	325	"use base '$base_pkg';\n",
	326	"$main_pkg_name->set_db('Main', '$dsn', '$db_user', '$db_pass');\n\n",
	327	);
	328
	329	for my $pkg_name (
bf4629e7	330	sort { $packages{ $a }{'order'} <=> $packages{ $b }{'order'} }
	331	keys %packages
	332	) {
8b183a02	333	my $pkg = $packages{$pkg_name} or next;
8b183a02	334	next unless $pkg->{'pkg_name'};
bf4629e7	335
41a7b982	336	$create .= join ( "\n",
bf4629e7	337	$sep,
41a7b982	338	"package " . $pkg->{'pkg_name'} . ";",
41a7b982	339	"use base '" . $pkg->{'base'} . "';",
bf4629e7	340	"use Class::DBI::Pager;\n\n",
41a7b982	341	);
41a7b982	342
9c6eb8e3	343	if ( $from ) {
	344	$create .=
	345	$pkg->{'pkg_name'}."->set_up_table('".$pkg->{'table'}."');\n\n";
	346	}
	347	else {
	348	my $table = $schema->get_table( $pkg->{'table'} );
	349	my @field_names = map { $_->name } $table->get_fields;
420f63c7	350
9c6eb8e3	351	$create .= join("\n",
	352	$pkg_name."->table('".$pkg->{'table'}."');\n",
	353	$pkg_name."->columns(All => qw/".
	354	join(' ', @field_names)."/);\n\n",
	355	);
	356	}
b789c790	357
41a7b982	358	$create .= "\n";
b789c790	359
bf4629e7	360	if ( my $pk = $pkg->{'pk_accessor'} ) {
	361	$create .= $pk;
	362	}
df602cfb	363
bf4629e7	364	if ( my @has_a = @{ $pkg->{'has_a'} \|\| [] } ) {
	365	$create .= $_ for @has_a;
	366	}
	367
41a7b982	368	foreach my $has_many_key ( keys %{ $pkg->{'has_many'} } ) {
	369	if ( my @has_many = @{ $pkg->{'has_many'}{$has_many_key} \|\| [] } ) {
	370	$create .= $_ for @has_many;
	371	}
	372	}
6c45056f	373	}
df602cfb	374
bf4629e7	375	$create .= "1;\n";
	376
	377	return $create;
f42e7027	378	}
	379
	380	1;
	381
bf4629e7	382	# -------------------------------------------------------------------
	383
	384	=pod
f42e7027	385
	386	=head1 NAME
	387
bf4629e7	388	SQL::Translator::Producer::ClassDBI - create Class::DBI classes from schema
f42e7027	389
	390	=head1 SYNOPSIS
	391
1eee27d3	392	Use this producer as you would any other from SQL::Translator. See
1eee27d3	393	L<SQL::Translator> for details.
f42e7027	394
1eee27d3	395	This package utilizes SQL::Translator's formatting methods
	396	format_package_name(), format_pk_name(), format_fk_name(), and
	397	format_table_name() as it creates classes, one per table in the schema
	398	provided. An additional base class is also created for database connectivity
	399	configuration. See L<Class::DBI> for details on how this works.
f42e7027	400
6c45056f	401	=head1 AUTHORS
f42e7027	402
7c2e6f47	403	Allen Day E<lt>allenday@ucla.eduE<gt>,
5f054727	404	Ying Zhang E<lt>zyolive@yahoo.comE<gt>,
799df8f9	405	Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.