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Re^3: Querying data with and & or when using DBIx::Class

by Your Mother (Canon)
on Sep 17, 2013 at 14:31 UTC ( #1054453=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Querying data with and & or when using DBIx::Class
in thread Querying data with and & or when using DBIx::Class

So, what's going on here is you're using a string in place of a(n anonymous) hash.

$whrcls = "ID => $id, color => $color1";

Should be-

$whrcls = { ID => $id, color => $color1 }; # OR something like my %params = ( ID => $id, color => $color1 ); $whrcls = \%params;

It looks like you might be using some global variables and non-standard code structures (method instead of plain sub). Globals are going to tend to come back and bite you. Definitely avoid them. Non-standard stuff like method signatures has a dearth of examples and help and can come with really deep and difficult edge case bugs. I don't want to put you off that necessarily but if you're having a little trouble with Perl syntax it might not be the best place to jump in.


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Re^4: Querying data with and & or when using DBIx::Class
by phildeman (Acolyte) on Sep 17, 2013 at 20:31 UTC
    Thanks again for your response.

    I am using MooseX.

    The issue is resolved. Instead of building the WHERE clause in $whrcls, I simply added the complete DBIx::Class search within the if/else statement:

    method get_colors( $id, $color1, $color2 ){
        my @mycolor_objs;
        if(!$color2){
            @mycolor_objs = $schema->resultset( 'TblColors' )->search({ ID => $id, color => $color1 },
                                    { order_by => 'ID' });
        }
        else {
            @myscolor_objs = $schema->resultset( 'TblColors' )->search({ ID => $id,
                                    -or => [ color => $color1, color => $color2 ] },
                                    { order_by => 'ID' });
        }
    }

    I am unsure at this moment, but it seems DBIx::Class is a little sensitive when using a scalar to represent the hash being passed as the WHERE clause. Thanks again. When I have a little more time, I will research building WHERE clauses with scalars.

      it seems DBIx::Class is a little sensitive when using a scalar...

      Don't confuse scalar for string just because a scalar often holds strings. They aren't the same. A hash ref can be put into a scalar ( my $hash_ref = \%some_hash or my $x = {}) and hash refs are the only kind of argument DBIC takes for its search and options clauses: never strings. There is no way to (safely and reliably) separate out the bind values and parse the intention of the tree from a string. Compare your original with what is necessary-

      print "ID => $id, color => $color1", $/; print { ID => $id, color => $color1 }, $/;
Re^4: Querying data with and & or when using DBIx::Class
by phildeman (Acolyte) on Sep 17, 2013 at 20:35 UTC
    Thanks again for your response.

    I am using MooseX.

    The issue is resolved. Instead of building the WHERE clause in $whrcls, I simply added the complete DBIx::Class search within the if/else statement:

    method get_colors( $id, $color1, $color2 ){
        my @mycolor_objs;
        if(!$color2){
            @mycolor_objs = $schema->resultset( 'TblColors' )->search({ ID => $id, color => $color1 },
                                    { order_by => 'ID' });
        }
        else {
            @myscolor_objs = $schema->resultset( 'TblColors' )->search({ ID => $id,
                                    -or => [ color => $color1, color => $color2 ] },
                                    { order_by => 'ID' });
        }
    }

    I am unsure at this moment, but it seems DBIx::Class is a little sensitive when using a scalar to represent the hash being passed as the WHERE clause.

    Thanks again. When I have a little more time, I will research building WHERE clauses with scalars.

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