X-Git-Url: https://git.decadent.org.uk/gitweb/?a=blobdiff_plain;f=lib%2FMaypole%2FModel%2FCDBI.pm;h=e15745b08f613eca147ae6aa8c63d4d7f738892d;hb=dd369c8a18080c4f27237f23b5842d53da05f570;hp=34aa7417d10a0880f863d6241979a28db7b04d91;hpb=6d2982560f68030ec5153d40e444575745640688;p=maypole.git diff --git a/lib/Maypole/Model/CDBI.pm b/lib/Maypole/Model/CDBI.pm index 34aa741..e15745b 100644 --- a/lib/Maypole/Model/CDBI.pm +++ b/lib/Maypole/Model/CDBI.pm @@ -1,125 +1,778 @@ package Maypole::Model::CDBI; -use base qw(Maypole::Model::Base Class::DBI); -use Lingua::EN::Inflect::Number qw(to_PL); -use Class::DBI::AsForm; -use Class::DBI::FromCGI; -use Class::DBI::Loader; -use Class::DBI::AbstractSearch; -use Class::DBI::Plugin::RetrieveAll; -use Class::DBI::Pager; -use CGI::Untaint; use strict; +use Data::Dumper; + =head1 NAME Maypole::Model::CDBI - Model class based on Class::DBI =head1 DESCRIPTION -This is a master model class which uses C to do all the hard +This is a master model class which uses L to do all the hard work of fetching rows and representing them as objects. It is a good model to copy if you're replacing it with other database abstraction modules. +It implements a base set of methods required for a Maypole Data Model. + +It inherits accessor and helper methods from L. + +When specified as the application model, it will use Class::DBI::Loader +to generate the model classes from the provided database. If you do not +wish to use this functionality, use L which +will instead use Class::DBI classes provided. + =cut -sub related { - my ($self, $r) = @_; - # Has-many methods; XXX this is a hack - map {to_PL($_)} - grep { exists $r->{config}{ok_tables}{$_} } - map {$_->table} - keys %{shift->__hasa_list || {}} -} - -sub do_edit :Exported { - my ($self, $r) = @_; - my $h = CGI::Untaint->new(%{$r->{params}}); - my ($obj) = @{$r->objects || []}; - if ($obj) { - # We have something to edit - $obj->update_from_cgi($h); - warn "Updating an object ($obj) with ".Dumper($h); use Data::Dumper; - } else { - $obj = $self->create_from_cgi($h); +use base qw(Maypole::Model::Base Class::DBI); +#use Class::DBI::Plugin::Type; +use Class::DBI::Loader; +use Class::DBI::AbstractSearch; +use Class::DBI::Plugin::RetrieveAll; +use Class::DBI::Pager; +use Lingua::EN::Inflect::Number qw(to_PL); +use attributes (); + +use Maypole::Model::CDBI::AsForm; +use Maypole::Model::CDBI::FromCGI; +use CGI::Untaint::Maypole; + +=head2 Untainter + +Set the class you use to untaint and validate form data +Note it must be of type CGI::Untaint::Maypole (takes $r arg) or CGI::Untaint + +=cut +sub Untainter { 'CGI::Untaint::Maypole' }; + +# or if you like bugs + +#use Class::DBI::FromCGI; +#use CGI::Untaint; +#sub Untainter { 'CGI::Untaint' }; + + +__PACKAGE__->mk_classdata($_) for (qw/COLUMN_INFO/); + +=head1 Action Methods + +Action methods are methods that are accessed through web (or other public) interface. + +=head2 do_edit + +If there is an object in C<$r-Eobjects>, then it should be edited +with the parameters in C<$r-Eparams>; otherwise, a new object should +be created with those parameters, and put back into C<$r-Eobjects>. +The template should be changed to C, or C if there were any +errors. A hash of errors will be passed to the template. + +=cut + +sub do_edit : Exported { + my ($self, $r, $obj) = @_; + + my $config = $r->config; + my $table = $r->table; + + # handle cancel button hit + if ( $r->{params}->{cancel} ) { + $r->template("list"); + $r->objects( [$self->retrieve_all] ); + return; + } + + my $required_cols = $config->{$table}{required_cols} || $self->required_columns; + my $ignored_cols = $config->{$table}{ignore_cols} || []; + + ($obj, my $fatal, my $creating) = $self->_do_update_or_create($r, $obj, $required_cols, $ignored_cols); + + # handle errors, if none, proceed to view the newly created/updated object + my %errors = $fatal ? (FATAL => $fatal) : $obj->cgi_update_errors; + + if (%errors) { + # Set it up as it was: + $r->template_args->{cgi_params} = $r->params; + + # replace user unfriendly error messages with something nicer + + foreach (@{$config->{$table}->{required_cols}}) { + next unless ($errors{$_}); + my $key = $_; + s/_/ /g; + $r->template_args->{errors}{ucfirst($_)} = 'This field is required, please provide a valid value'; + $r->template_args->{errors}{$key} = 'This field is required, please provide a valid value'; + delete $errors{$key}; } - if (my %errors = $obj->cgi_update_errors) { - # Set it up as it was: - warn "There were errors: ".Dumper(\%errors)."\n"; - $r->{template_args}{cgi_params} = $r->{params}; - $r->{template_args}{errors} = \%errors; - $r->{template} = "edit"; - } else { - $r->{template} = "view"; + + foreach (keys %errors) { + my $key = $_; + s/_/ /g; + $r->template_args->{errors}{ucfirst($_)} = 'Please provide a valid value for this field'; + $r->template_args->{errors}{$key} = 'Please provide a valid value for this field'; } - $r->objects([ $obj ]); + + undef $obj if $creating; + + die "do_update failed with error : $fatal" if ($fatal); + $r->template("edit"); + } else { + $r->template("view"); + } + + + + $r->objects( $obj ? [$obj] : []); } -sub delete :Exported { - my ($self, $r) = @_; - $_->SUPER::delete for @{ $r->objects || [] }; - $r->objects([ $self->retrieve_all ]); - $r->{template} = "list"; +# split out from do_edit to be reported by Mp::P::Trace +sub _do_update_or_create { + my ($self, $r, $obj, $required_cols, $ignored_cols) = @_; + + my $fatal; + my $creating = 0; + + my $h = $self->Untainter->new( %{$r->params} ); + + # update or create + if ($obj) { + # We have something to edit + eval { $obj->update_from_cgi( $h => { + required => $required_cols, + ignore => $ignored_cols, + }); + $obj->update(); # pos fix for bug 17132 'autoupdate required by do_edit' + }; + $fatal = $@; + } else { + eval { + $obj = $self->create_from_cgi( $h => { + required => $required_cols, + ignore => $ignored_cols, + } ); + }; + $fatal = $@; + $creating++; + } + return $obj, $fatal, $creating; } -sub adopt { - my ($self, $child) = @_; - $child->autoupdate(1); - if (grep { $_ eq "name" } $child->columns) { # Common case - $child->columns( Stringify => qw/ name / ); - } # Otherwise, work it out for yourself. -} - -sub search :Exported { - return shift->SUPER::search(@_) if caller ne "Maypole::Model::Base"; - # A real CDBI search. - my ($self, $r) = @_; - my %fields = map {$_ => 1 } $self->columns; - my $oper = "like"; # For now - use Carp; Carp::confess("Urgh") unless ref $r; - my %params = %{$r->{params}}; - my %values = map { $_ => {$oper, $params{$_} } } - grep { $params{$_} and $fields{$_} } keys %params; - - $r->objects([ %values ? $self->search_where(%values) : $self->retrieve_all ]); +=head2 delete + +Deprecated method that calls do_delete or a given classes delete method, please +use do_delete instead + +=head2 do_delete + +Unsuprisingly, this command causes a database record to be forever lost. + +This method replaces the, now deprecated, delete method provided in prior versions + +=cut + +sub delete : Exported { + my $self = shift; + my ($sub) = (caller(1))[3]; + # So subclasses can still send delete down ... + $sub =~ /^(.+)::([^:]+)$/; + if ($1 ne "Maypole::Model::Base" && $2 ne "delete") { + $self->SUPER::delete(@_); + } else { + warn "Maypole::Model::CDBI delete method is deprecated\n"; + $self->do_delete(@_); + } +} + +sub do_delete { + my ( $self, $r ) = @_; + # FIXME: handle fatal error with exception + $_->SUPER::delete for @{ $r->objects || [] }; +# $self->dbi_commit; + $r->objects( [ $self->retrieve_all ] ); + $r->{template} = "list"; + $self->list($r); +} + +=head2 search + +Deprecated searching method - use do_search instead. + +=head2 do_search + +This action method searches for database records, it replaces +the, now deprecated, search method previously provided. + +=cut + +sub search : Exported { + my $self = shift; + my ($sub) = (caller(1))[3]; + # So subclasses can still send search down ... + if ($sub =~ /^(.+)::([^:]+)$/) { + return ($1 ne "Maypole::Model::Base" && $2 ne "search") ? + $self->SUPER::search(@_) : $self->do_search(@_); + } else { + $self->SUPER::search(@_); + } +} + +sub do_search : Exported { + my ( $self, $r ) = @_; + my %fields = map { $_ => 1 } $self->columns; + my $oper = "like"; # For now + my %params = %{ $r->{params} }; + my %values = map { $_ => { $oper, $params{$_} } } + grep { defined $params{$_} && length ($params{$_}) && $fields{$_} } + keys %params; + $r->template("list"); + if ( !%values ) { return $self->list($r) } + my $order = $self->order($r); + $self = $self->do_pager($r); + $r->objects( + [ + $self->search_where( + \%values, ( $order ? { order_by => $order } : () ) + ) + ] + ); $r->{template_args}{search} = 1; } -sub list :Exported { - my ($self, $r) = @_; - my %ok_columns = map {$_ => 1} $self->columns; - if ( my $rows = $r->config->{rows_per_page}) { - $self = $self->pager($rows, $r->query->{page}); - $r->{template_args}{pager} = $self; - } - my $order; - if ($order = $r->query->{order} and $ok_columns{$order}) { - $r->objects([ $self->retrieve_all_sorted_by( $order. - ($r->query->{o2} eq "desc" && " DESC") - )]); - } else { - $r->objects([ $self->retrieve_all ]); +=head2 list + +The C method fills C<$r-Eobjects> with all of the +objects in the class. The results are paged using a pager. + +=cut + +sub list : Exported { + my ( $self, $r ) = @_; + my $order = $self->order($r); + $self = $self->do_pager($r); + if ($order) { + $r->objects( [ $self->retrieve_all_sorted_by($order) ] ); + } + else { + $r->objects( [ $self->retrieve_all ] ); + } +} + +############################################################################### +# Helper methods + +=head1 Helper Methods + + +=head2 adopt + +This class method is passed the name of a model class that represensts a table +and allows the master model class to do any set-up required. + +=cut + +sub adopt { + my ( $self, $child ) = @_; + $child->autoupdate(1); + if ( my $col = $child->stringify_column ) { + $child->columns( Stringify => $col ); + } +} + + +=head2 related + +This method returns a list of has-many accessors. A brewery has many +beers, so C needs to return C. + +=cut + +sub related { + my ( $self, $r ) = @_; + return keys %{ $self->meta_info('has_many') || {} }; +} + + +=head2 related_class + +Given an accessor name as a method, this function returns the class this accessor returns. + +=cut + +sub related_class { + my ( $self, $r, $accessor ) = @_; + my $meta = $self->meta_info; + my @rels = keys %$meta; + my $related; + foreach (@rels) { + $related = $meta->{$_}{$accessor}; + last if $related; + } + return unless $related; + + my $mapping = $related->{args}->{mapping}; + if ( $mapping and @$mapping ) { + return $related->{foreign_class}->meta_info('has_a')->{$$mapping[0]}->{foreign_class}; + } + else { + return $related->{foreign_class}; + } + } + +=head2 related_meta + + $class->related_meta($col); + +Returns the hash ref of relationship meta info for a given column. + +=cut + +sub related_meta { + my ($self,$r, $accssr) = @_; + $self->_croak("You forgot to put the place holder for 'r' or forgot the accssr parameter") unless $accssr; + my $class_meta = $self->meta_info; + if (my ($rel_type) = grep { defined $class_meta->{$_}->{$accssr} } + keys %$class_meta) + { return $class_meta->{$rel_type}->{$accssr} }; +} + + + +=head2 stringify_column + + Returns the name of the column to use when stringifying + and object. + +=cut + +sub stringify_column { + my $class = shift; + return ( + $class->columns("Stringify"), + ( grep { /^(name|title)$/i } $class->columns ), + ( grep { /(name|title)/i } $class->columns ), + ( grep { !/id$/i } $class->primary_columns ), + )[0]; +} + +=head2 do_pager + + Sets the pager template argument ($r->{template_args}{pager}) + to a Class::DBI::Pager object based on the rows_per_page + value set in the configuration of the application. + + This pager is used via the pager macro in TT Templates, and + is also accessible via Mason. + +=cut + +sub do_pager { + my ( $self, $r ) = @_; + if ( my $rows = $r->config->rows_per_page ) { + return $r->{template_args}{pager} = + $self->pager( $rows, $r->query->{page} ); } + else { return $self } +} + + +=head2 order + + Returns the SQL order syntax based on the order parameter passed + to the request, and the valid columns.. i.e. 'title ASC' or 'date_created DESC'. + + $sql .= $self->order($r); + + If the order column is not a column of this table, + or an order argument is not passed, then the return value is undefined. + + Note: the returned value does not start with a space. + +=cut + +sub order { + my ( $self, $r ) = @_; + my %ok_columns = map { $_ => 1 } $self->columns; + my $q = $r->query; + my $order = $q->{order}; + return unless $order and $ok_columns{$order}; + $order .= ' DESC' if $q->{o2} and $q->{o2} eq 'desc'; + return $order; } +=head2 setup + + This method is inherited from Maypole::Model::Base and calls setup_database, + which uses Class::DBI::Loader to create and load Class::DBI classes from + the given database schema. + +=cut + +=head2 setup_database + +The $opts argument is a hashref of options. The "options" key is a hashref of +Database connection options . Other keys may be various Loader arguments or +flags. It has this form: + { + # DB connection options + options { AutoCommit => 1 , ... }, + # Loader args + relationships => 1, + ... + } + +=cut + sub setup_database { - my ($self, $config, $namespace, $dsn, $u, $p) = @_; - $config->{dsn} = $dsn; - $config->{loader} = Class::DBI::Loader->new( - namespace => $namespace, - dsn => $dsn, - user => $u, - password => $p, + my ( $class, $config, $namespace, $dsn, $u, $p, $opts ) = @_; + $dsn ||= $config->dsn; + $u ||= $config->user; + $p ||= $config->pass; + $opts ||= $config->opts; + $config->dsn($dsn); + warn "No DSN set in config" unless $dsn; + $config->loader || $config->loader( + Class::DBI::Loader->new( + namespace => $namespace, + dsn => $dsn, + user => $u, + password => $p, + %$opts, + ) ); $config->{classes} = [ $config->{loader}->classes ]; $config->{tables} = [ $config->{loader}->tables ]; + + my @table_class = map { $_ . " => " . $config->{loader}->_table2class($_) } @{ $config->{tables} }; + warn( 'Loaded tables to classes: ' . join ', ', @table_class ) + if $namespace->debug; } +=head2 class_of + + returns class for given table + +=cut + sub class_of { - my ($self, $r, $table) = @_; - return $r->config->{loader}->_table2class($table); + my ( $self, $r, $table ) = @_; + return $r->config->loader->_table2class($table); # why not find_class ? } -1; +=head2 fetch_objects + +Returns 1 or more objects of the given class when provided with the request + +=cut + +sub fetch_objects { + my ($class, $r)=@_; + my @pcs = $class->primary_columns; + if ( $#pcs ) { + my %pks; + @pks{@pcs}=(@{$r->{args}}); + return $class->retrieve( %pks ); + } + return $class->retrieve( $r->{args}->[0] ); +} + + + + + +=head2 _isa_class + +Private method to return the class a column +belongs to that was inherited by an is_a relationship. +This should probably be public but need to think of API + +=cut + +sub _isa_class { + my ($class, $col) = @_; + $class->_croak( "Need a column for _isa_class." ) unless $col; + my $isaclass; + my $isa = $class->meta_info("is_a") || {}; + foreach ( keys %$isa ) { + $isaclass = $isa->{$_}->foreign_class; + return $isaclass if ($isaclass->find_column($col)); + } + return; # col not in a is_a class +} + + +# Thanks to dave baird -- form builder for these private functions +# sub _column_info { +sub _column_info { + my $self = shift; + my $dbh = $self->db_Main; + + my $meta; # The info we are after + my ($catalog, $schema) = (undef, undef); + # Dave is suspicious this (above undefs) could + # break things if driver useses this info + + my $original_metadata; + # '%' is a search pattern for columns - matches all columns + if ( my $sth = $dbh->column_info( $catalog, $schema, $self->table, '%' ) ) { + $dbh->errstr && die "Error getting column info sth: " . $dbh->errstr; + $self->COLUMN_INFO ($self->_hash_type_meta( $sth )); + } else { + $self->COLUMN_INFO ($self->_hash_typeless_meta( )); + } + + return $self->COLUMN_INFO; +} + +sub _hash_type_meta { + my ($self, $sth) = @_; + my $meta; + while ( my $row = $sth->fetchrow_hashref ) { + my $colname = $row->{COLUMN_NAME} || $row->{column_name}; + + # required / nullable + $meta->{$colname}{nullable} = $row->{NULLABLE}; + $meta->{$colname}{required} = ( $meta->{$colname}{nullable} == 0 ) ? 1 : 0; + + # default + if (defined $row->{COLUMN_DEF}) { + my $default = $row->{COLUMN_DEF}; + $default =~ s/['"]?(.*?)['"]?::.*$/$1/; + $meta->{$colname}{default} = $default; + }else { + $meta->{$colname}{default} = ''; + } + + # type + my $type = $row->{mysql_type_name} || $row->{type}; + unless ($type) { + $type = $row->{TYPE_NAME}; + if ($row->{COLUMN_SIZE}) { + $type .= "($row->{COLUMN_SIZE})"; + } + } + $type =~ s/['"]?(.*)['"]?::.*$/$1/; + # Bool if tinyint + if ($type and $type =~ /^tinyint/i and $row->{COLUMN_SIZE} == 1) { + $type = 'BOOL'; + } + $meta->{$colname}{type} = $type; + + # order + $meta->{$colname}{position} = $row->{ORDINAL_POSITION} + } + return $meta; +} + +# typeless db e.g. sqlite +sub _hash_typeless_meta { + my ( $self ) = @_; + + $self->set_sql( fb_meta_dummy => 'SELECT * FROM __TABLE__ WHERE 1=0' ) + unless $self->can( 'sql_fb_meta_dummy' ); + + my $sth = $self->sql_fb_meta_dummy; + $sth->execute or die "Error executing column info: " . $sth->errstr;; + + # see 'Statement Handle Attributes' in the DBI docs for a list of available attributes + my $cols = $sth->{NAME}; + my $types = $sth->{TYPE}; + # my $sizes = $sth->{PRECISION}; # empty + # my $nulls = $sth->{NULLABLE}; # empty + + # we haven't actually fetched anything from the sth, so need to tell DBI we're not going to + $sth->finish; + + my $order = 0; + my $meta; + foreach my $col ( @$cols ) { + my $col_meta; + $col_meta->{nullable} = 1; + $col_meta->{required} = 0; + $col_meta->{default} = ''; + $col_meta->{position} = $order++; + # type_name is taken literally from the schema, but is not actually used by sqlite, + # so it can be anything, e.g. varchar or varchar(xxx) or VARCHAR etc. + my $type = shift( @$types ); + $col_meta->{type} = ($type =~ /(\w+)\((\w+)\)/) ? $1 :$type ; + $meta->{$col} = $col_meta; + } + return $meta; +} + +=head2 column_type + + my $type = $class->column_type('column_name'); + +This returns the 'type' of this column (VARCHAR(20), BIGINT, etc.) +For now, it returns "BOOL" for tinyints. + +TODO :: TEST with enums + +=cut + +sub column_type { + my $class = shift; + my $colname = shift or die "Need a column for column_type"; + $class->_column_info() unless (ref $class->COLUMN_INFO); + + if ($class->_isa_class($colname)) { + return $class->_isa_class($colname)->column_type($colname); + } + unless ( $class->find_column($colname) ) { + warn "$colname is not a recognised column in this class ", ref $class || $class, "\n"; + return undef; + } + return $class->COLUMN_INFO->{$colname}{type}; +} + +=head2 required_columns + + Accessor to get/set required columns for forms, validation, etc. + + Returns list of required columns. Accepts an array ref of column names. + + $class->required_columns([qw/foo bar baz/]); + + Allows you to specify the required columns for a class, over-riding any + assumptions and guesses made by Maypole. + + Use this instead of $config->{$table}{required_cols} + + Note : you need to setup the model class before calling this method. + +=cut + +sub required_columns { + my ($class, $columns) = @_; + $class->_column_info() unless ref $class->COLUMN_INFO; + my $column_info = $class->COLUMN_INFO; + + if ($columns) { + foreach my $colname ( @$columns ) { + if ($class->_isa_class($colname)) { + $class->_isa_class($colname)->COLUMN_INFO->{$colname}{required} = 1 + unless ($class->_isa_class($colname)->column_required); + next; + } + unless ( $class->find_column($colname) ) { + warn "$colname is not a recognised column in this class ", ref $class || $class, "\n"; + next; + } + $column_info->{$colname}{required} = 1; + } + $class->COLUMN_INFO($column_info); + } + + return [ grep ($column_info->{$_}{required}, keys %$column_info) ] ; +} + +=head2 column_required + + Returns true if a column is required + + my $required = $class->column_required($column_name); + + Columns can be required by the application but not the database, but not the other way around, + hence there is also a column_nullable method which will tell you if the column is nullable + within the database itself. + +=cut + +sub column_required { + my ($class, $colname) = @_; + $colname or $class->_croak( "Need a column for column_nullable" ); + $class->_column_info() unless ref $class->COLUMN_INFO; + if ($class->_isa_class($colname)) { + return $class->_isa_class($colname)->column_required($colname); + } + unless ( $class->find_column($colname) ) { + # handle non-existant columns + warn "$colname is not a recognised column in this class ", ref $class || $class, "\n"; + return undef; + } + return $class->COLUMN_INFO->{$colname}{required} || 0; +} + +=head2 column_nullable + + Returns true if a column can be NULL within the underlying database and false if not. + + my $nullable = $class->column_nullable($column_name); + + Any columns that are not nullable will automatically be specified as required, you can + also specify nullable columns as required within your application. + + It is recomended you use column_required rather than column_nullable within your + application, this method is more useful if extending the model or handling your own + validation. + +=cut + +sub column_nullable { + my $class = shift; + my $colname = shift or $class->_croak( "Need a column for column_nullable" ); + + $class->_column_info() unless ref $class->COLUMN_INFO; + if ($class->_isa_class($colname)) { + return $class->_isa_class($colname)->column_nullable($colname); + } + unless ( $class->find_column($colname) ) { + # handle non-existant columns + warn "$colname is not a recognised column in this class ", ref $class || $class, "\n"; + return undef; + } + return $class->COLUMN_INFO->{$colname}{nullable} || 0; +} + +=head2 column_default + +Returns default value for column or the empty string. +Columns with NULL, CURRENT_TIMESTAMP, or Zeros( 0000-00...) for dates and times +have '' returned. + +=cut + +sub column_default { + my $class = shift; + my $colname = shift or $class->_croak( "Need a column for column_default"); + $class->_column_info() unless (ref $class->COLUMN_INFO); + if ($class->_isa_class($colname)) { + return $class->_isa_class($colname)->column_default($colname); + } + unless ( $class->find_column($colname) ) { + warn "$colname is not a recognised column in this class ", ref $class || $class, "\n"; + return undef; + } + + return $class->COLUMN_INFO->{$colname}{default}; +} + +=head2 get_classmetadata + +Gets class meta data *excluding cgi input* for the passed in class or the +calling class. *NOTE* excludes cgi inputs. This method is handy to call from +templates when you need some metadata for a related class. + +=cut + +sub get_classmetadata { + my ($self, $class) = @_; # class is class we want data for + $class ||= $self; + $class = ref $class || $class; + + my %res; + $res{name} = $class; + $res{colnames} = {$class->column_names}; + $res{columns} = [$class->display_columns]; + $res{list_columns} = [$class->list_columns]; + $res{moniker} = $class->moniker; + $res{plural} = $class->plural_moniker; + $res{table} = $class->table; + $res{column_metadata} = (ref $class->COLUMN_INFO) ? $class->COLUMN_INFO : $class->_column_info() ; + return \%res; +} + + +1;