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    DBI Exception: DBD::Oracle::st execute failed: ORA-01400: cannot inser
    +t NULL into ("SDB2"."BOOKS"."ID") (DBD ERROR: OCIStmtExecute) [for St
    +atement "INSERT INTO books (rating, title) VALUES (?, ?)" with ParamV
    +alues: :p1='5', :p2='TCPIP_Illustrated_Vol-2']
    
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    sub url_create : Local {
           my ($self, $c, $title, $rating, $author_id) = @_;
    ...
    # Call create() on the book model object. Pass the table 
            # columns/field values we want to set as hash values
            my $book = $c->model('DB::Books')->create({
    
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                    title  => $title,
                    rating => $rating
                });
    
    }