X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FResultSource.pm;h=ceb5d3675187b3d67d97d91b00b2e478f2984f4e;hb=5ac6a04477849fabc50271c5b7ab15a080ae0109;hp=335eb5c59470197446e1244b108dbcb5cfdbca65;hpb=8452e496adea0c57b81f413e11b2f5b5b6e62c5c;p=dbsrgits%2FDBIx-Class.git diff --git a/lib/DBIx/Class/ResultSource.pm b/lib/DBIx/Class/ResultSource.pm index 335eb5c..ceb5d36 100644 --- a/lib/DBIx/Class/ResultSource.pm +++ b/lib/DBIx/Class/ResultSource.pm @@ -4,14 +4,15 @@ use strict; use warnings; use DBIx::Class::ResultSet; +use Carp::Clan qw/^DBIx::Class/; -use Carp qw/croak/; +use Storable; use base qw/DBIx::Class/; __PACKAGE__->load_components(qw/AccessorGroup/); __PACKAGE__->mk_group_accessors('simple' => - qw/_ordered_columns _columns _primaries name resultset_class result_class schema from _relationships/); + qw/_ordered_columns _columns _primaries _unique_constraints name resultset_class resultset_attributes result_class schema from _relationships/); =head1 NAME @@ -33,30 +34,14 @@ sub new { $class = ref $class if ref $class; my $new = bless({ %{$attrs || {}} }, $class); $new->{resultset_class} ||= 'DBIx::Class::ResultSet'; - $new->{_ordered_columns} ||= []; - $new->{_columns} ||= {}; - $new->{_relationships} ||= {}; + $new->{resultset_attributes} = { %{$new->{resultset_attributes} || {}} }; + $new->{_ordered_columns} = [ @{$new->{_ordered_columns}||[]}]; + $new->{_columns} = { %{$new->{_columns}||{}} }; + $new->{_relationships} = { %{$new->{_relationships}||{}} }; $new->{name} ||= "!!NAME NOT SET!!"; return $new; } -sub add_columns { - my ($self, @cols) = @_; - $self->_ordered_columns( \@cols ) - if !$self->_ordered_columns; - push @{ $self->_ordered_columns }, @cols; - while (my $col = shift @cols) { - - my $column_info = ref $cols[0] ? shift : {}; - # If next entry is { ... } use that for the column info, if not - # use an empty hashref - - $self->_columns->{$col} = $column_info; - } -} - -*add_column = \&add_columns; - =head2 add_columns $table->add_columns(qw/col1 col2 col3/); @@ -74,13 +59,30 @@ Convenience alias to add_columns =cut -sub resultset { - my $self = shift; - return $self->resultset_class->new($self); +sub add_columns { + my ($self, @cols) = @_; + $self->_ordered_columns( \@cols ) + if !$self->_ordered_columns; + my @added; + my $columns = $self->_columns; + while (my $col = shift @cols) { + + my $column_info = ref $cols[0] ? shift(@cols) : {}; + # If next entry is { ... } use that for the column info, if not + # use an empty hashref + + push(@added, $col) unless exists $columns->{$col}; + + $columns->{$col} = $column_info; + } + push @{ $self->_ordered_columns }, @added; + return $self; } -=head2 has_column - +*add_column = \&add_columns; + +=head2 has_column + if ($obj->has_column($col)) { ... } Returns 1 if the source has a column of this name, 0 otherwise. @@ -102,61 +104,104 @@ Returns the column metadata hashref for a column. sub column_info { my ($self, $column) = @_; - croak "No such column $column" unless exists $self->_columns->{$column}; + $self->throw_exception("No such column $column") + unless exists $self->_columns->{$column}; + if ( (! $self->_columns->{$column}->{data_type}) + && $self->schema && $self->storage() ){ + my $info; +############ eval for the case of storage without table + eval{ + $info = $self->storage->columns_info_for ( $self->from() ); + }; + if ( ! $@ ){ + for my $col ( keys %{$self->_columns} ){ + for my $i ( keys %{$info->{$col}} ){ + $self->_columns()->{$col}->{$i} = $info->{$col}->{$i}; + } + } + } + } return $self->_columns->{$column}; } =head2 columns - my @column_names = $obj->columns; - -=cut - -sub columns { - croak "columns() is a read-only accessor, did you mean add_columns()?" if (@_ > 1); - return keys %{shift->_columns}; -} + my @column_names = $obj->columns; -=head2 ordered_columns - - my @column_names = $obj->ordered_columns; - -Like columns(), but returns column names using the order in which they were -originally supplied to add_columns(). +Returns all column names in the order they were declared to add_columns =cut -sub ordered_columns { - return @{shift->{_ordered_columns}||[]}; +sub columns { + my $self=shift; + $self->throw_exception("columns() is a read-only accessor, did you mean add_columns()?") if (@_ > 1); + return @{$self->{_ordered_columns}||[]}; } -=head2 set_primary_key(@cols) - +=head2 set_primary_key(@cols) + Defines one or more columns as primary key for this source. Should be called after C. - -=cut + +Additionally, defines a unique constraint named C. + +=cut sub set_primary_key { my ($self, @cols) = @_; # check if primary key columns are valid columns for (@cols) { - $self->throw("No such column $_ on table ".$self->name) + $self->throw_exception("No such column $_ on table ".$self->name) unless $self->has_column($_); } $self->_primaries(\@cols); + + $self->add_unique_constraint(primary => \@cols); } -=head2 primary_columns - +=head2 primary_columns + Read-only accessor which returns the list of primary keys. - -=cut + +=cut sub primary_columns { return @{shift->_primaries||[]}; } +=head2 add_unique_constraint + +Declare a unique constraint on this source. Call once for each unique +constraint. + + # For e.g. UNIQUE (column1, column2) + __PACKAGE__->add_unique_constraint(constraint_name => [ qw/column1 column2/ ]); + +=cut + +sub add_unique_constraint { + my ($self, $name, $cols) = @_; + + for (@$cols) { + $self->throw_exception("No such column $_ on table ".$self->name) + unless $self->has_column($_); + } + + my %unique_constraints = $self->unique_constraints; + $unique_constraints{$name} = $cols; + $self->_unique_constraints(\%unique_constraints); +} + +=head2 unique_constraints + +Read-only accessor which returns the list of unique constraints on this source. + +=cut + +sub unique_constraints { + return %{shift->_unique_constraints||{}}; +} + =head2 from Returns an expression of the source to be supplied to storage to specify @@ -208,7 +253,7 @@ command immediately before C. An arrayref containing a list of accessors in the foreign class to proxy in the main class. If, for example, you do the following: - __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => qw[/ margle /] }); + __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => [ qw/margle/ ] }); Then, assuming Bar has an accessor named margle, you can do: @@ -230,14 +275,20 @@ created, which calls C for the relationship. sub add_relationship { my ($self, $rel, $f_source_name, $cond, $attrs) = @_; - die "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 }; $rels{$rel} = { class => $f_source_name, + source => $f_source_name, cond => $cond, attrs => $attrs }; $self->_relationships(\%rels); + return $self; + + # XXX disabled. doesn't work properly currently. skip in tests. + my $f_source = $self->schema->source($f_source_name); unless ($f_source) { eval "require $f_source_name;"; @@ -245,6 +296,10 @@ sub add_relationship { die $@ unless $@ =~ /Can't locate/; } $f_source = $f_source_name->result_source; + #my $s_class = ref($self->schema); + #$f_source_name =~ m/^${s_class}::(.*)$/; + #$self->schema->register_class(($1 || $f_source_name), $f_source_name); + #$f_source = $self->schema->source($f_source_name); } return unless $f_source; # Can't test rel without f_source @@ -253,7 +308,7 @@ sub add_relationship { if ($@) { # If the resolve failed, back out and re-throw the error delete $rels{$rel}; # $self->_relationships(\%rels); - die "Error creating relationship $rel: $@"; + $self->throw_exception("Error creating relationship $rel: $@"); } 1; } @@ -279,6 +334,17 @@ sub relationship_info { return $self->_relationships->{$rel}; } +=head2 has_relationship($rel) + +Returns 1 if the source has a relationship of this name, 0 otherwise. + +=cut + +sub has_relationship { + my ($self, $rel) = @_; + return exists $self->_relationships->{$rel}; +} + =head2 resolve_join($relation) Returns the join structure required for the related result source @@ -286,10 +352,184 @@ Returns the join structure required for the related result source =cut sub resolve_join { - shift->result_class->_resolve_join(@_); + my ($self, $join, $alias) = @_; + if (ref $join eq 'ARRAY') { + return map { $self->resolve_join($_, $alias) } @$join; + } elsif (ref $join eq 'HASH') { + return map { $self->resolve_join($_, $alias), + $self->related_source($_)->resolve_join($join->{$_}, $_) } + keys %$join; + } elsif (ref $join) { + $self->throw_exception("No idea how to resolve join reftype ".ref $join); + } else { + my $rel_info = $self->relationship_info($join); + $self->throw_exception("No such relationship ${join}") unless $rel_info; + my $type = $rel_info->{attrs}{join_type} || ''; + return [ { $join => $self->related_source($join)->from, + -join_type => $type }, + $self->resolve_condition($rel_info->{cond}, $join, $alias) ]; + } +} + +=head2 resolve_condition($cond, $rel, $alias|$object) + +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 +a related conditional from that object. + +=cut + +sub resolve_condition { + my ($self, $cond, $rel, $for) = @_; + #warn %$cond; + if (ref $cond eq 'HASH') { + my %ret; + while (my ($k, $v) = each %{$cond}) { + # 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}"); + if (ref $for) { # Object + #warn "$self $k $for $v"; + $ret{$k} = $for->get_column($v); + #warn %ret; + } else { + $ret{"${rel}.${k}"} = "${for}.${v}"; + } + } + return \%ret; + } elsif (ref $cond eq 'ARRAY') { + return [ map { $self->resolve_condition($_, $rel, $for) } @$cond ]; + } else { + die("Can't handle this yet :("); + } +} + +=head2 resolve_prefetch (hashref/arrayref/scalar) + +Accepts one or more relationships for the current source and returns an +array of column names for each of those relationships. Column names are +prefixed relative to the current source, in accordance with where they appear +in the supplied relationships. Examples: + + my $source = $schema->resultset('Tag')->source; + @columns = $source->resolve_prefetch( { cd => 'artist' } ); + + # @columns = + #( + # 'cd.cdid', + # 'cd.artist', + # 'cd.title', + # 'cd.year', + # 'cd.artist.artistid', + # 'cd.artist.name' + #) + + @columns = $source->resolve_prefetch( qw[/ cd /] ); + + # @columns = + #( + # 'cd.cdid', + # 'cd.artist', + # 'cd.title', + # 'cd.year' + #) + + $source = $schema->resultset('CD')->source; + @columns = $source->resolve_prefetch( qw[/ artist producer /] ); + + # @columns = + #( + # 'artist.artistid', + # 'artist.name', + # 'producer.producerid', + # 'producer.name' + #) + +=cut + +sub resolve_prefetch { + my( $self, $pre, $alias ) = @_; + use Data::Dumper; + #$alias ||= $self->name; + #warn $alias, Dumper $pre; + if( ref $pre eq 'ARRAY' ) { + return map { $self->resolve_prefetch( $_, $alias ) } @$pre; + } + elsif( ref $pre eq 'HASH' ) { + my @ret = + map { + $self->resolve_prefetch($_, $alias), + $self->related_source($_)->resolve_prefetch( $pre->{$_}, $_ ) + } + keys %$pre; + #die Dumper \@ret; + return @ret; + } + elsif( ref $pre ) { + $self->throw_exception( "don't know how to resolve prefetch reftype " . ref $pre); + } + else { + my $rel_info = $self->relationship_info( $pre ); + $self->throw_exception( $self->name . " has no such relationship '$pre'" ) unless $rel_info; + my $prefix = $alias && $alias ne 'me' ? "$alias.$pre" : $pre; + my @ret = map { "$prefix.$_" } $self->related_source($pre)->columns; + #warn $alias, Dumper (\@ret); + return @ret; + } +} + +=head2 related_source($relname) + +Returns the result source for the given relationship + +=cut + +sub related_source { + my ($self, $rel) = @_; + if( !$self->has_relationship( $rel ) ) { + $self->throw_exception("No such relationship '$rel'"); + } + return $self->schema->source($self->relationship_info($rel)->{source}); +} + +=head2 resultset + +Returns a resultset for the given source created by calling + +$self->resultset_class->new($self, $self->resultset_attributes) + +=head2 resultset_class + +Simple accessor. + +=head2 resultset_attributes + +Simple accessor. + +=cut + +sub resultset { + my $self = shift; + return $self->resultset_class->new($self, $self->{resultset_attributes}); +} + +=cut + +=head2 throw_exception + +See schema's throw_exception + +=cut + +sub throw_exception { + my $self = shift; + if (defined $self->schema) { + $self->schema->throw_exception(@_); + } else { + croak(@_); + } } -1; =head1 AUTHORS