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package App::Dochazka::REST::Model::Interval;

use 5.012;
use strict;
use warnings;
use App::CELL qw( $CELL $log $meta $site );
use Data::Dumper;
use App::Dochazka::REST::Model::Activity qw( code_by_aid );
use App::Dochazka::REST::Model::Lock qw( count_locks_in_tsrange );
use App::Dochazka::REST::Model::Shared qw( 
    canonicalize_tsrange 
    cud 
    cud_generic
    load 
    load_multiple 
    select_single
    tsrange_intersection
);
use App::Dochazka::REST::Holiday qw(
    calculate_hours
    holidays_and_weekends
    tsrange_to_dates_and_times
);
use Params::Validate qw( :all );

# we get 'spawn', 'reset', and accessors from parent
use parent 'App::Dochazka::Common::Model::Interval';



=head1 NAME

App::Dochazka::REST::Model::Interval - activity intervals data model




=head1 SYNOPSIS

    use App::Dochazka::REST::Model::Interval;

    ...


=head1 DESCRIPTION

A description of the activity interval data model follows.


=head2 Intervals in the database

Activity intervals are stored in the C<intervals> database table, which has
the following structure:

    CREATE TABLE intervals (
       iid         serial PRIMARY KEY,
       eid         integer REFERENCES employees (eid) NOT NULL,
       aid         integer REFERENCES activities (aid) NOT NULL,
       intvl       tsrange NOT NULL,
       long_desc   text,
       remark      text,
       EXCLUDE USING gist (eid WITH =, intvl WITH &&)
    );

Note the use of the C<tsrange> operator introduced in PostgreSQL 9.2.

In addition to the Interval ID (C<iid>), which is assigned by PostgreSQL,