use DBIx::Class::ResultSet;
use Carp::Clan qw/^DBIx::Class/;
-
use Storable;
-use Scalar::Util qw/weaken/;
use base qw/DBIx::Class/;
__PACKAGE__->load_components(qw/AccessorGroup/);
-__PACKAGE__->mk_group_accessors('simple' =>
- qw/_ordered_columns _columns _primaries _unique_constraints name resultset_attributes schema from _relationships/);
-__PACKAGE__->mk_group_accessors('component_class' => qw/resultset_class result_class/);
+__PACKAGE__->mk_group_accessors('simple' => qw/_ordered_columns
+ _columns _primaries _unique_constraints name resultset_attributes
+ schema from _relationships column_info_from_storage source_name/);
+
+__PACKAGE__->mk_group_accessors('component_class' => qw/resultset_class
+ result_class/);
-=head1 NAME
+=head1 NAME
DBIx::Class::ResultSource - Result source object
=head1 METHODS
+=pod
+
+=head2 new
+
+ $class->new();
+
+ $class->new({attribute_name => value});
+
+Creates a new ResultSource object. Not normally called directly by end users.
+
=cut
sub new {
my ($class, $attrs) = @_;
$class = ref $class if ref $class;
- my $new = bless({ %{$attrs || {}}, _resultset => undef }, $class);
+
+ my $new = { %{$attrs || {}}, _resultset => undef };
+ bless $new, $class;
+
$new->{resultset_class} ||= 'DBIx::Class::ResultSet';
$new->{resultset_attributes} = { %{$new->{resultset_attributes} || {}} };
$new->{_ordered_columns} = [ @{$new->{_ordered_columns}||[]}];
$new->{_relationships} = { %{$new->{_relationships}||{}} };
$new->{name} ||= "!!NAME NOT SET!!";
$new->{_columns_info_loaded} ||= 0;
+ if(!defined $new->column_info_from_storage) {
+ $new->{column_info_from_storage} = 1
+ }
return $new;
}
$table->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...);
-Adds columns to the result source. If supplied key => hashref pairs uses
-the hashref as the column_info for that column.
-
-Repeated calls of this method will add more columns, not replace them.
+Adds columns to the result source. If supplied key => hashref pairs, uses
+the hashref as the column_info for that column. Repeated calls of this
+method will add more columns, not replace them.
-The contents of the column_info are not set in stone, the following
-keys are currently recognised/used by DBIx::Class.
+The contents of the column_info are not set in stone. The following
+keys are currently recognised/used by DBIx::Class:
=over 4
-=item accessor
+=item accessor
Use this to set the name of the accessor for this column. If unset,
the name of the column will be used.
=item data_type
-This contains the column type, it is automatically filled by the
+This contains the column type. It is automatically filled by the
L<SQL::Translator::Producer::DBIx::Class::File> producer, and the
-L<DBIx::Class::Schema::Loader> module. If you do not enter the
+L<DBIx::Class::Schema::Loader> module. If you do not enter a
data_type, DBIx::Class will attempt to retrieve it from the
-database for you, using L<DBI>s column_info method. The values of this
+database for you, using L<DBI>'s column_info method. The values of this
key are typically upper-cased.
-Currently there is no standard set of values for the data_type, use
-whatever your database(s) support.
+Currently there is no standard set of values for the data_type. Use
+whatever your database supports.
=item size
The length of your column, if it is a column type that can have a size
-restriction. This is currently not used by DBIx::Class.
+restriction. This is currently not used by DBIx::Class.
=item is_nullable
-If the column is allowed to contain NULL values, set a true value
-(typically 1), here. This is currently not used by DBIx::Class.
+Set this to a true value for a columns that is allowed to contain
+NULL values. This is currently not used by DBIx::Class.
=item is_auto_increment
-Set this to a true value if this is a column that is somehow
-automatically filled. This is currently not used by DBIx::Class.
+Set this to a true value for a column whose value is somehow
+automatically set. This is used to determine which columns to empty
+when cloning objects using C<copy>.
=item is_foreign_key
-Set this to a true value if this column represents a key from a
+Set this to a true value for a column that contains a key from a
foreign table. This is currently not used by DBIx::Class.
=item default_value
-Set this to the default value which will be inserted into this column
-by the database. Can contain either values or functions. This is
-currently not used by DBIx::Class.
+Set this to the default value which will be inserted into a column
+by the database. Can contain either a value or a function. This is
+currently not used by DBIx::Class.
=item sequence
-If your column is using a sequence to create it's values, set the name
-of the sequence here, to allow the values to be retrieved
-automatically by the L<DBIx::Class::PK::Auto> module. PK::Auto will
-attempt to retrieve the sequence name from the database, if this value
-is left unset.
+Set this on a primary key column to the name of the sequence used to
+generate a new key value. If not specified, L<DBIx::Class::PK::Auto>
+will attempt to retrieve the name of the sequence from the database
+automatically.
=back
$table->add_column('col' => \%info?);
-Convenience alias to add_columns
+Convenience alias to add_columns.
=cut
sub add_columns {
my ($self, @cols) = @_;
$self->_ordered_columns(\@cols) unless $self->_ordered_columns;
-
+
my @added;
my $columns = $self->_columns;
while (my $col = shift @cols) {
if ($obj->has_column($col)) { ... }
-Returns 1 if the source has a column of this name, 0 otherwise.
+Returns true if the source has a column of this name, false otherwise.
=cut
sub column_info {
my ($self, $column) = @_;
- $self->throw_exception("No such column $column")
+ $self->throw_exception("No such column $column")
unless exists $self->_columns->{$column};
#warn $self->{_columns_info_loaded}, "\n";
- if ( ! $self->_columns->{$column}{data_type}
- and ! $self->{_columns_info_loaded}
+ if ( ! $self->_columns->{$column}{data_type}
+ and $self->column_info_from_storage
+ and ! $self->{_columns_info_loaded}
and $self->schema and $self->storage )
{
$self->{_columns_info_loaded}++;
my $info;
- # eval for the case of storage without table
- eval { $info = $self->storage->columns_info_for($self->from) };
+ my $lc_info;
+ # eval for the case of storage without table
+ eval { $info = $self->storage->columns_info_for( $self->from ) };
unless ($@) {
+ for my $realcol ( keys %{$info} ) {
+ $lc_info->{lc $realcol} = $info->{$realcol};
+ }
foreach my $col ( keys %{$self->_columns} ) {
- foreach my $i ( keys %{$info->{$col}} ) {
- $self->_columns->{$col}{$i} = $info->{$col}{$i};
- }
+ $self->_columns->{$col} = { %{ $self->_columns->{$col}}, %{$info->{$col} || $lc_info->{lc $col}} };
}
}
}
return $self->_columns->{$column};
}
+=head2 column_info_from_storage
+
+Enables or disables the on-demand automatic loading of the above
+column metadata from storage as neccesary. Defaults to true in the
+current release, but will default to false in future releases starting
+with 0.08000. This is *deprecated*, and should not be used. It will
+be removed before 1.0.
+
+ __PACKAGE__->column_info_from_storage(0);
+ __PACKAGE__->column_info_from_storage(1);
+
=head2 columns
my @column_names = $obj->columns;
-Returns all column names in the order they were declared to add_columns
+Returns all column names in the order they were declared to add_columns.
=cut
sub columns {
my $self = shift;
- $self->throw_exception("columns() is a read-only accessor, did you mean add_columns()?") if (@_ > 1);
+ $self->throw_exception(
+ "columns() is a read-only accessor, did you mean add_columns()?"
+ ) if (@_ > 1);
return @{$self->{_ordered_columns}||[]};
}
+=head2 remove_columns
+
+ $table->remove_columns(qw/col1 col2 col3/);
+
+Removes columns from the result source.
+
+=head2 remove_column
+
+ $table->remove_column('col');
+
+Convenience alias to remove_columns.
+
+=cut
+
+sub remove_columns {
+ my ($self, @cols) = @_;
+
+ return unless $self->_ordered_columns;
+
+ my $columns = $self->_columns;
+ my @remaining;
+
+ foreach my $col (@{$self->_ordered_columns}) {
+ push @remaining, $col unless grep(/$col/, @cols);
+ }
+
+ foreach (@cols) {
+ delete $columns->{$_};
+ };
+
+ $self->_ordered_columns(\@remaining);
+}
+
+*remove_column = \&remove_columns;
+
=head2 set_primary_key
-=head3 Arguments: (@cols)
+=over 4
+
+=item Arguments: @cols
+
+=back
Defines one or more columns as primary key for this source. Should be
called after C<add_columns>.
Additionally, defines a unique constraint named C<primary>.
The primary key columns are used by L<DBIx::Class::PK::Auto> to
-retrieve automatically created values from the database.
+retrieve automatically created values from the database.
=cut
=head2 add_unique_constraint
Declare a unique constraint on this source. Call once for each unique
-constraint. Unique constraints are used when you call C<find> on a
-L<DBIx::Class::ResultSet>, only columns in the constraint are searched,
+constraint.
+
+ # For UNIQUE (column1, column2)
+ __PACKAGE__->add_unique_constraint(
+ constraint_name => [ qw/column1 column2/ ],
+ );
+
+Alternatively, you can specify only the columns:
- # For e.g. UNIQUE (column1, column2)
- __PACKAGE__->add_unique_constraint(constraint_name => [ qw/column1 column2/ ]);
+ __PACKAGE__->add_unique_constraint([ qw/column1 column2/ ]);
+
+This will result in a unique constraint named C<table_column1_column2>, where
+C<table> is replaced with the table name.
+
+Unique constraints are used, for example, when you call
+L<DBIx::Class::ResultSet/find>. Only columns in the constraint are searched.
=cut
sub add_unique_constraint {
- my ($self, $name, $cols) = @_;
+ my $self = shift;
+ my $cols = pop @_;
+ my $name = shift;
+
+ $name ||= $self->name_unique_constraint($cols);
foreach my $col (@$cols) {
$self->throw_exception("No such column $col on table " . $self->name)
$self->_unique_constraints(\%unique_constraints);
}
+=head2 name_unique_constraint
+
+Return a name for a unique constraint containing the specified columns. These
+names consist of the table name and each column name, separated by underscores.
+
+For example, a constraint on a table named C<cd> containing the columns
+C<artist> and C<title> would result in a constraint name of C<cd_artist_title>.
+
+=cut
+
+sub name_unique_constraint {
+ my ($self, $cols) = @_;
+
+ return join '_', $self->name, @$cols;
+}
+
=head2 unique_constraints
Read-only accessor which returns the list of unique constraints on this source.
return %{shift->_unique_constraints||{}};
}
+=head2 unique_constraint_names
+
+Returns the list of unique constraint names defined on this source.
+
+=cut
+
+sub unique_constraint_names {
+ my ($self) = @_;
+
+ my %unique_constraints = $self->unique_constraints;
+
+ return keys %unique_constraints;
+}
+
+=head2 unique_constraint_columns
+
+Returns the list of columns that make up the specified unique constraint.
+
+=cut
+
+sub unique_constraint_columns {
+ my ($self, $constraint_name) = @_;
+
+ my %unique_constraints = $self->unique_constraints;
+
+ $self->throw_exception(
+ "Unknown unique constraint $constraint_name on '" . $self->name . "'"
+ ) unless exists $unique_constraints{$constraint_name};
+
+ return @{ $unique_constraints{$constraint_name} };
+}
+
=head2 from
Returns an expression of the source to be supplied to storage to specify
-retrieval from this source; in the case of a database the required FROM clause
-contents.
+retrieval from this source. In the case of a database, the required FROM
+clause contents.
-=cut
+=head2 schema
+
+Returns the L<DBIx::Class::Schema> object that this result source
+belongs too.
=head2 storage
-Returns the storage handle for the current schema.
+Returns the storage handle for the current schema.
See also: L<DBIx::Class::Storage>
$source->add_relationship('relname', 'related_source', $cond, $attrs);
-The relation name can be arbitrary, but must be unique for each relationship
-attached to this result source. 'related_source' should be the name with
-which the related result source was registered with the current schema
-(for simple schemas this is usally either Some::Namespace::Foo or just Foo)
+The relationship name can be arbitrary, but must be unique for each
+relationship attached to this result source. 'related_source' should
+be the name with which the related result source was registered with
+the current schema. For example:
-The condition needs to be an SQL::Abstract-style representation of the join
-between the tables. For example, if you're creating a rel from Author to Book,
+ $schema->source('Book')->add_relationship('reviews', 'Review', {
+ 'foreign.book_id' => 'self.id',
+ });
+
+The condition C<$cond> needs to be an L<SQL::Abstract>-style
+representation of the join between the tables. For example, if you're
+creating a rel from Author to Book,
{ 'foreign.author_id' => 'self.id' }
=item proxy
-An arrayref containing a list of accessors in the foreign class to
-proxy in the main class. If, for example, you do the following:
+An arrayref containing a list of accessors in the foreign class to proxy in
+the main class. If, for example, you do the following:
- __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => [ qw/margle/] });
+ CD->might_have(liner_notes => 'LinerNotes', undef, {
+ proxy => [ qw/notes/ ],
+ });
-Then, assuming Bar has an accessor named margle, you can do:
+Then, assuming LinerNotes has an accessor named notes, you can do:
- my $obj = Foo->find(1);
- $obj->margle(10); # set margle; Bar object is created if it doesn't exist
+ my $cd = CD->find(1);
+ # set notes -- LinerNotes object is created if it doesn't exist
+ $cd->notes('Notes go here');
=item accessor
Specifies the type of accessor that should be created for the
-relationship. Valid values are C<single> (for when there is only a single
-related object), C<multi> (when there can be many), and C<filter> (for
-when there is a single related object, but you also want the relationship
-accessor to double as a column accessor). For C<multi> accessors, an
-add_to_* method is also created, which calls C<create_related> for the
+relationship. Valid values are C<single> (for when there is only a single
+related object), C<multi> (when there can be many), and C<filter> (for
+when there is a single related object, but you also want the relationship
+accessor to double as a column accessor). For C<multi> accessors, an
+add_to_* method is also created, which calls C<create_related> for the
relationship.
=back
sub add_relationship {
my ($self, $rel, $f_source_name, $cond, $attrs) = @_;
- $self->throw_exception("Can't create relationship without join condition") unless $cond;
+ $self->throw_exception("Can't create relationship without join condition")
+ unless $cond;
$attrs ||= {};
my %rels = %{ $self->_relationships };
my $f_source = $self->schema->source($f_source_name);
unless ($f_source) {
- eval "require $f_source_name;";
- if ($@) {
- die $@ unless $@ =~ /Can't locate/;
- }
+ $self->ensure_class_loaded($f_source_name);
$f_source = $f_source_name->result_source;
#my $s_class = ref($self->schema);
#$f_source_name =~ m/^${s_class}::(.*)$/;
eval { $self->resolve_join($rel, 'me') };
if ($@) { # If the resolve failed, back out and re-throw the error
- delete $rels{$rel}; #
+ delete $rels{$rel}; #
$self->_relationships(\%rels);
$self->throw_exception("Error creating relationship $rel: $@");
}
=head2 relationships
-Returns all valid relationship names for this source
+Returns all relationship names for this source.
=cut
=head2 relationship_info
-=head3 Arguments: ($relname)
+=over 4
+
+=item Arguments: $relname
+
+=back
-Returns the relationship information for the specified relationship name
+Returns a hash of relationship information for the specified relationship
+name.
=cut
sub relationship_info {
my ($self, $rel) = @_;
return $self->_relationships->{$rel};
-}
+}
=head2 has_relationship
-=head3 Arguments: ($rel)
+=over 4
+
+=item Arguments: $rel
+
+=back
-Returns 1 if the source has a relationship of this name, 0 otherwise.
+Returns true if the source has a relationship of this name, false otherwise.
=cut
return exists $self->_relationships->{$rel};
}
+=head2 reverse_relationship_info
+
+=over 4
+
+=item Arguments: $relname
+
+=back
+
+Returns an array of hash references of relationship information for
+the other side of the specified relationship name.
+
+=cut
+
+sub reverse_relationship_info {
+ my ($self, $rel) = @_;
+ my $rel_info = $self->relationship_info($rel);
+ my $ret = {};
+
+ return $ret unless ((ref $rel_info->{cond}) eq 'HASH');
+
+ my @cond = keys(%{$rel_info->{cond}});
+ my @refkeys = map {/^\w+\.(\w+)$/} @cond;
+ my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond;
+
+ # Get the related result source for this relationship
+ my $othertable = $self->related_source($rel);
+
+ # Get all the relationships for that source that related to this source
+ # whose foreign column set are our self columns on $rel and whose self
+ # columns are our foreign columns on $rel.
+ my @otherrels = $othertable->relationships();
+ my $otherrelationship;
+ foreach my $otherrel (@otherrels) {
+ my $otherrel_info = $othertable->relationship_info($otherrel);
+
+ my $back = $othertable->related_source($otherrel);
+ next unless $back->name eq $self->name;
+
+ my @othertestconds;
+
+ if (ref $otherrel_info->{cond} eq 'HASH') {
+ @othertestconds = ($otherrel_info->{cond});
+ }
+ elsif (ref $otherrel_info->{cond} eq 'ARRAY') {
+ @othertestconds = @{$otherrel_info->{cond}};
+ }
+ else {
+ next;
+ }
+
+ foreach my $othercond (@othertestconds) {
+ my @other_cond = keys(%$othercond);
+ my @other_refkeys = map {/^\w+\.(\w+)$/} @other_cond;
+ my @other_keys = map {$othercond->{$_} =~ /^\w+\.(\w+)$/} @other_cond;
+ next if (!$self->compare_relationship_keys(\@refkeys, \@other_keys) ||
+ !$self->compare_relationship_keys(\@other_refkeys, \@keys));
+ $ret->{$otherrel} = $otherrel_info;
+ }
+ }
+ return $ret;
+}
+
+=head2 compare_relationship_keys
+
+=over 4
+
+=item Arguments: $keys1, $keys2
+
+=back
+
+Returns true if both sets of keynames are the same, false otherwise.
+
+=cut
+
+sub compare_relationship_keys {
+ my ($self, $keys1, $keys2) = @_;
+
+ # Make sure every keys1 is in keys2
+ my $found;
+ foreach my $key (@$keys1) {
+ $found = 0;
+ foreach my $prim (@$keys2) {
+ if ($prim eq $key) {
+ $found = 1;
+ last;
+ }
+ }
+ last unless $found;
+ }
+
+ # Make sure every key2 is in key1
+ if ($found) {
+ foreach my $prim (@$keys2) {
+ $found = 0;
+ foreach my $key (@$keys1) {
+ if ($prim eq $key) {
+ $found = 1;
+ last;
+ }
+ }
+ last unless $found;
+ }
+ }
+
+ return $found;
+}
+
=head2 resolve_join
-=head3 Arguments: ($relation)
+=over 4
+
+=item Arguments: $relation
+
+=back
-Returns the join structure required for the related result source
+Returns the join structure required for the related result source.
=cut
=head2 resolve_condition
-=head3 Arguments: ($cond, $as, $alias|$object)
+=over 4
+
+=item Arguments: $cond, $as, $alias|$object
+
+=back
Resolves the passed condition to a concrete query fragment. If given an alias,
returns a join condition; if given an object, inverts that object to produce
#warn %$cond;
if (ref $cond eq 'HASH') {
my %ret;
- while (my ($k, $v) = each %{$cond}) {
+ foreach my $k (keys %{$cond}) {
+ my $v = $cond->{$k};
# XXX should probably check these are valid columns
- $k =~ s/^foreign\.// || $self->throw_exception("Invalid rel cond key ${k}");
- $v =~ s/^self\.// || $self->throw_exception("Invalid rel cond val ${v}");
+ $k =~ s/^foreign\.// ||
+ $self->throw_exception("Invalid rel cond key ${k}");
+ $v =~ s/^self\.// ||
+ $self->throw_exception("Invalid rel cond val ${v}");
if (ref $for) { # Object
#warn "$self $k $for $v";
$ret{$k} = $for->get_column($v);
#warn %ret;
+ } elsif (!defined $for) { # undef, i.e. "no object"
+ $ret{$k} = undef;
} elsif (ref $as) { # reverse object
$ret{$v} = $as->get_column($k);
+ } elsif (!defined $as) { # undef, i.e. "no reverse object"
+ $ret{$v} = undef;
} else {
$ret{"${as}.${k}"} = "${for}.${v}";
}
=head2 resolve_prefetch
-=head3 Arguments: (hashref/arrayref/scalar)
+=over 4
+
+=item Arguments: hashref/arrayref/scalar
+
+=back
Accepts one or more relationships for the current source and returns an
array of column names for each of those relationships. Column names are
# 'artist.name',
# 'producer.producerid',
# 'producer.name'
- #)
+ #)
=cut
my $rel_info = $self->relationship_info( $pre );
$self->throw_exception( $self->name . " has no such relationship '$pre'" )
unless $rel_info;
- my $as_prefix = ($alias =~ /^.*?\.(.*)$/ ? $1.'.' : '');
+ my $as_prefix = ($alias =~ /^.*?\.(.+)$/ ? $1.'.' : '');
my $rel_source = $self->related_source($pre);
if (exists $rel_info->{attrs}{accessor}
$self->throw_exception(
"Can't prefetch has_many ${pre} (join cond too complex)")
unless ref($rel_info->{cond}) eq 'HASH';
- my @key = map { (/^foreign\.(.*)$/ ? ($1) : ()); }
+ my @key = map { (/^foreign\.(.+)$/ ? ($1) : ()); }
keys %{$rel_info->{cond}};
$collapse->{"${as_prefix}${pre}"} = \@key;
my @ord = (ref($rel_info->{attrs}{order_by}) eq 'ARRAY'
=head2 related_source
-=head3 Arguments: ($relname)
+=over 4
+
+=item Arguments: $relname
+
+=back
-Returns the result source object for the given relationship
+Returns the result source object for the given relationship.
=cut
return $self->schema->source($self->relationship_info($rel)->{source});
}
+=head2 related_class
+
+=over 4
+
+=item Arguments: $relname
+
+=back
+
+Returns the class name for objects in the given relationship.
+
+=cut
+
+sub related_class {
+ my ($self, $rel) = @_;
+ if( !$self->has_relationship( $rel ) ) {
+ $self->throw_exception("No such relationship '$rel'");
+ }
+ return $self->schema->class($self->relationship_info($rel)->{source});
+}
+
=head2 resultset
-Returns a resultset for the given source, by calling:
+Returns a resultset for the given source. This will initially be created
+on demand by calling
$self->resultset_class->new($self, $self->resultset_attributes)
+but is cached from then on unless resultset_class changes.
+
=head2 resultset_class
Set the class of the resultset, this is useful if you want to create your
sub resultset {
my $self = shift;
- $self->throw_exception('resultset does not take any arguments. If you want another resultset, call it on the schema instead.') if scalar @_;
- return $self->{_resultset} if ref $self->{_resultset} eq $self->resultset_class;
- return $self->{_resultset} = do {
- my $rs = $self->resultset_class->new($self, $self->{resultset_attributes});
- weaken $rs->result_source;
- $rs;
- };
+ $self->throw_exception(
+ 'resultset does not take any arguments. If you want another resultset, '.
+ 'call it on the schema instead.'
+ ) if scalar @_;
+
+ # disabled until we can figure out a way to do it without consistency issues
+ #
+ #return $self->{_resultset}
+ # if ref $self->{_resultset} eq $self->resultset_class;
+ #return $self->{_resultset} =
+
+ return $self->resultset_class->new(
+ $self, $self->{resultset_attributes}
+ );
}
+=head2 source_name
+
+=over 4
+
+=item Arguments: $source_name
+
+=back
+
+Set the name of the result source when it is loaded into a schema.
+This is usefull if you want to refer to a result source by a name other than
+its class name.
+
+ package ArchivedBooks;
+ use base qw/DBIx::Class/;
+ __PACKAGE__->table('books_archive');
+ __PACKAGE__->source_name('Books');
+
+ # from your schema...
+ $schema->resultset('Books')->find(1);
+
=head2 throw_exception
-See throw_exception in L<DBIx::Class::Schema>.
+See L<DBIx::Class::Schema/"throw_exception">.
=cut
sub throw_exception {
my $self = shift;
- if (defined $self->schema) {
+ if (defined $self->schema) {
$self->schema->throw_exception(@_);
} else {
croak(@_);
}
}
-
=head1 AUTHORS
Matt S. Trout <mst@shadowcatsystems.co.uk>
projects / dbsrgits/DBIx-Class.git / blobdiff