openerp.base.list = function (openerp) {
'use strict';
openerp.base.views.add('list', 'openerp.base.ListView');
openerp.base.ListView = openerp.base.View.extend( /** @lends openerp.base.ListView# */ {
    defaults: {
        // records can be selected one by one
        'selectable': true,
        // list rows can be deleted
        'deletable': true,
        // whether the column headers should be displayed
        'header': true,
        // display addition button, with that label
        'addable': "New",
        // whether the list view can be sorted, note that once a view has been
        // sorted it can not be reordered anymore
        'sortable': true,
        // whether the view rows can be reordered (via vertical drag & drop)
        'reorderable': true
    },
    /**
     * Core class for list-type displays.
     *
     * As a view, needs a number of view-related parameters to be correctly
     * instantiated, provides options and overridable methods for behavioral
     * customization.
     *
     * See constructor parameters and method documentations for information on
     * the default behaviors and possible options for the list view.
     *
     * @constructs
     * @param view_manager
     * @param session An OpenERP session object
     * @param element_id the id of the DOM elements this view should link itself to
     * @param {openerp.base.DataSet} dataset the dataset the view should work with
     * @param {String} view_id the listview's identifier, if any
     * @param {Object} options A set of options used to configure the view
     * @param {Boolean} [options.selectable=true] determines whether view rows are selectable (e.g. via a checkbox)
     * @param {Boolean} [options.header=true] should the list's header be displayed
     * @param {Boolean} [options.deletable=true] are the list rows deletable
     * @param {null|String} [options.addable="New"] should the new-record button be displayed, and what should its label be. Use ``null`` to hide the button.
     * @param {Boolean} [options.sortable=true] is it possible to sort the table by clicking on column headers
     * @param {Boolean} [options.reorderable=true] is it possible to reorder list rows
     *
     * @borrows openerp.base.ActionExecutor#execute_action as #execute_action
     */
    init: function(view_manager, session, element_id, dataset, view_id, options) {
        this._super(session, element_id);
        this.view_manager = view_manager || new openerp.base.NullViewManager();
        this.dataset = dataset;
        this.model = dataset.model;
        this.view_id = view_id;

        this.columns = [];

        this.options = _.extend({}, this.defaults, options || {});
        this.flags =  this.view_manager.action.flags;

        this.set_groups(new openerp.base.ListView.Groups(this));
    },
    /**
     * Set a custom Group construct as the root of the List View.
     *
     * @param {openerp.base.ListView.Groups} groups
     */
    set_groups: function (groups) {
        var self = this;
        if (this.groups) {
            $(this.groups).unbind("selected deleted action row_link");
            delete this.groups;
        }

        this.groups = groups;
        $(this.groups).bind({
            'selected': function (e, ids, records) {
                self.do_select(ids, records);
            },
            'deleted': function (e, ids) {
                self.do_delete(ids);
            },
            'action': function (e, action_name, id, callback) {
                self.do_action(action_name, id, callback);
            },
            'row_link': function (e, index, id, dataset) {
                self.do_activate_record(index, id, dataset);
            }
        });
    },
    /**
     * View startup method, the default behavior is to set the ``oe-listview``
     * class on its root element and to perform an RPC load call.
     *
     * @returns {$.Deferred} loading promise
     */
    start: function() {
        this.$element.addClass('oe-listview');
        return this.reload_view();
    },
    /**
     * Called after loading the list view's description, sets up such things
     * as the view table's columns, renders the table itself and hooks up the
     * various table-level and row-level DOM events (action buttons, deletion
     * buttons, selection of records, [New] button, selection of a given
     * record, ...)
     *
     * Sets up the following:
     *
     * * Processes arch and fields to generate a complete field descriptor for each field
     * * Create the table itself and allocate visible columns
     * * Hook in the top-level (header) [New|Add] and [Delete] button
     * * Sets up showing/hiding the top-level [Delete] button based on records being selected or not
     * * Sets up event handlers for action buttons and per-row deletion button
     * * Hooks global callback for clicking on a row
     * * Sets up its sidebar, if any
     *
     * @param {Object} data wrapped fields_view_get result
     * @param {Object} data.fields_view fields_view_get result (processed)
     * @param {Object} data.fields_view.fields mapping of fields for the current model
     * @param {Object} data.fields_view.arch current list view descriptor
     * @param {Boolean} grouped Is the list view grouped
     */
    on_loaded: function(data, grouped) {
        var self = this;
        this.fields_view = data.fields_view;
        //this.log(this.fields_view);
        this.name = "" + this.fields_view.arch.attrs.string;

        this.setup_columns(this.fields_view.fields, grouped);

        if (!this.fields_view.sorted) { this.fields_view.sorted = {}; }

        this.$element.html(QWeb.render("ListView", this));

        // Head hook
        this.$element.find('#oe-list-add').click(this.do_add_record);
        this.$element.find('#oe-list-delete')
                .hide()
                .click(this.do_delete_selected);
        this.$element.find('thead').delegate('th[data-id]', 'click', function (e) {
            e.stopPropagation();

            self.dataset.sort($(this).data('id'));

            // TODO: should only reload content (and set the right column to a sorted display state)
            self.reload_view();
        });

        this.view_manager.sidebar.set_toolbar(data.fields_view.toolbar);
    },
    /**
     * Sets up the listview's columns: merges view and fields data, move
     * grouped-by columns to the front of the columns list and make them all
     * visible.
     *
     * @param {Object} fields fields_view_get's fields section
     * @param {Boolean} [grouped] Should the grouping columns (group and count) be displayed
     */
    setup_columns: function (fields, grouped) {
        var domain_computer = openerp.base.form.compute_domain;

        var noop = function () { return {}; };
        var field_to_column = function (field) {
            var name = field.attrs.name;
            var column = _.extend({id: name, tag: field.tag},
                    field.attrs, fields[name]);
            // attrs computer
            if (column.attrs) {
                var attrs = JSON.parse(column.attrs);
                column.attrs_for = function (fields) {
                    var result = {};
                    for (var attr in attrs) {
                        result[attr] = domain_computer(attrs[attr], fields);
                    }
                    return result;
                };
            } else {
                column.attrs_for = noop;
            }
            return column;
        };
        
        this.columns.splice(0, this.columns.length);
        this.columns.push.apply(
                this.columns,
                _(this.fields_view.arch.children).map(field_to_column));
        if (grouped) {
            this.columns.unshift({
                id: '_group', tag: '', string: "Group", meta: true,
                attrs_for: function () { return {}; }
            }, {
                id: '_count', tag: '', string: '#', meta: true,
                attrs_for: function () { return {}; }
            });
        }

        this.visible_columns = _.filter(this.columns, function (column) {
            return column.invisible !== '1';
        });

        this.aggregate_columns = _(this.columns).chain()
            .filter(function (column) {
                    return column['sum'] || column['avg'];})
            .map(function (column) {
                var func = column['sum'] ? 'sum' : 'avg';
                return {
                    field: column.id,
                    type: column.type,
                    'function': func,
                    label: column[func]
                };
            }).value();
    },
    /**
     * Used to handle a click on a table row, if no other handler caught the
     * event.
     *
     * The default implementation asks the list view's view manager to switch
     * to a different view (by calling
     * :js:func:`~openerp.base.ViewManager.on_mode_switch`), using the
     * provided record index (within the current list view's dataset).
     *
     * If the index is null, ``switch_to_record`` asks for the creation of a
     * new record.
     *
     * @param {Number|null} index the record index (in the current dataset) to switch to
     * @param {String} [view="form"] the view type to switch to
     */
    select_record:function (index, view) {
        view = view || 'form';
        this.dataset.index = index;
        _.delay(_.bind(function () {
            if(this.view_manager) {
                this.view_manager.on_mode_switch(view);
            }
        }, this));
    },
    do_show: function () {
        this.$element.show();
        if (this.hidden) {
            this.$element.find('table').append(
                this.groups.apoptosis().render());
            this.hidden = false;
        }
        this.view_manager.sidebar.do_refresh(true);
    },
    do_hide: function () {
        this.$element.hide();
        this.hidden = true;
    },
    /**
     * Reloads the list view based on the current settings (dataset & al)
     *
     * @param {Boolean} [grouped] Should the list be displayed grouped
     */
    reload_view: function (grouped) {
        var self = this;
        this.dataset.offset = 0;
        this.dataset.limit = false;
        return this.rpc('/base/listview/load', {
            model: this.model,
            view_id: this.view_id,
            toolbar: !!this.flags.sidebar
        }, function (field_view_get) {
            self.on_loaded(field_view_get, grouped);
        });
    },
    /**
     * re-renders the content of the list view
     */
    reload_content: function () {
        this.$element.find('table').append(
            this.groups.apoptosis().render(
                $.proxy(this, 'compute_aggregates')));
    },
    /**
     * Event handler for a search, asks for the computation/folding of domains
     * and contexts (and group-by), then reloads the view's content.
     *
     * @param {Array} domains a sequence of literal and non-literal domains
     * @param {Array} contexts a sequence of literal and non-literal contexts
     * @param {Array} groupbys a sequence of literal and non-literal group-by contexts
     * @returns {$.Deferred} fold request evaluation promise
     */
    do_search: function (domains, contexts, groupbys) {
        var self = this;
        return this.rpc('/base/session/eval_domain_and_context', {
            domains: domains,
            contexts: contexts,
            group_by_seq: groupbys
        }, function (results) {
            self.dataset.context = results.context;
            self.dataset.domain = results.domain;
            self.groups.datagroup = new openerp.base.DataGroup(
                self.session, self.model,
                results.domain, results.context,
                results.group_by);

            if (_.isEmpty(results.group_by) && !results.context['group_by_no_leaf']) {
                results.group_by = null;
            }
            self.reload_view(!!results.group_by).then(
                $.proxy(self, 'reload_content'));
        });
    },
    /**
     * Handles the signal to delete a line from the DOM
     *
     * @param {Array} ids the id of the object to delete
     */
    do_delete: function (ids) {
        if (!ids.length) {
            return;
        }
        var self = this;
        return $.when(this.dataset.unlink(ids)).then(function () {
            _(self.rows).chain()
                .map(function (row, index) {
                    return {
                        index: index,
                        id: row.data.id.value
                    };})
                .filter(function (record) {
                    return _.contains(ids, record.id);
                })
                .sort(function (a, b) {
                    // sort in reverse index order, so we delete from the end
                    // and don't blow up the following indexes (leading to
                    // removing the wrong records from the visible list)
                    return b.index - a.index;
                })
                .each(function (record) {
                    self.rows.splice(record.index, 1);
                });
            // TODO only refresh modified rows
        });
    },
    /**
     * Handles the signal indicating that a new record has been selected
     *
     * @param {Array} ids selected record ids
     * @param {Array} records selected record values
     */
    do_select: function (ids, records) {
        this.$element.find('#oe-list-delete')
            .toggle(!!ids.length);

        if (!records.length) {
            this.compute_aggregates();
            return;
        }
        this.compute_aggregates(records);
    },
    /**
     * Handles action button signals on a record
     *
     * @param {String} name action name
     * @param {Object} id id of the record the action should be called on
     * @param {Function} callback should be called after the action is executed, if non-null
     */
    do_action: function (name, id, callback) {
        var action = _.detect(this.columns, function (field) {
            return field.name === name;
        });
        if (!action) { return; }
        this.execute_action(
            action, this.dataset, this.session.action_manager,
            id, function () {
                if (callback) {
                    callback();
                }
        });
    },
    /**
     * Handles the activation of a record (clicking on it)
     *
     * @param {Number} index index of the record in the dataset
     * @param {Object} id identifier of the activated record
     * @param {openobject.base.DataSet} dataset dataset in which the record is available (may not be the listview's dataset in case of nested groups)
     */
    do_activate_record: function (index, id, dataset) {
        var self = this;
        _.extend(this.dataset, {
            domain: dataset.domain,
            context: dataset.context
        }).read_slice([], 0, false, function () {
            self.select_record(index);
        });
    },
    /**
     * Handles signal for the addition of a new record (can be a creation,
     * can be the addition from a remote source, ...)
     *
     * The default implementation is to switch to a new record on the form view
     */
    do_add_record: function () {
        this.select_record(null);
    },
    /**
     * Handles deletion of all selected lines
     */
    do_delete_selected: function () {
        this.do_delete(this.groups.get_selection().ids);
    },
    /**
     * Computes the aggregates for the current list view, either on the
     * records provided or on the records of the internal
     * :js:class:`~openerp.base.ListView.Group`, by calling
     * :js:func:`~openerp.base.ListView.group.get_records`.
     *
     * Then displays the aggregates in the table through
     * :js:method:`~openerp.base.ListView.display_aggregates`.
     *
     * @param {Array} [records]
     */
    compute_aggregates: function (records) {
        if (_.isEmpty(this.aggregate_columns)) {
            return;
        }
        if (_.isEmpty(records)) {
            records = this.groups.get_records();
        }

        var aggregator = this.build_aggregator(this.aggregate_columns);
        this.display_aggregates(
            _(records).reduce(aggregator, aggregator).value());
    },
    /**
     * Creates a stateful callable aggregator object, which can be reduced over
     * a collection of records in order to build the aggregations described
     * by the parameter
     *
     * @param {Array} aggregation_descriptors
     */
    build_aggregator: function (aggregation_descriptors) {
        var values = {};
        var descriptors = {};
        _(aggregation_descriptors).each(function (descriptor) {
            values[descriptor.field] = [];
            descriptors[descriptor.field] = descriptor;
        });

        var aggregator = function (_i, record) {
            _(values).each(function (collection, key) {
                collection.push(record[key]);
            });

            return aggregator;
        };
        aggregator.value = function () {
            var result = {};

            _(values).each(function (collection, key) {
                var value;
                switch(descriptors[key]['function']) {
                    case 'avg':
                        value = (_(collection).chain()
                                .filter(function (item) {
                                    return !_.isUndefined(item); })
                                .reduce(function (total, item) {
                                    return total + item; }, 0).value()
                            / collection.length);
                        break;
                    case 'sum':
                        value = (_(collection).chain()
                            .filter(function (item) {
                                return !_.isUndefined(item); })
                            .reduce(function (total, item) {
                                return total + item; }, 0).value());
                        break;
                }
                result[key] = value;
            });

            return result;
        };
        return aggregator;
    },
    display_aggregates: function (aggregation) {
        var $footer = this.$element.find('.oe-list-footer').empty();
        _(this.aggregate_columns).each(function (column) {
            $(_.sprintf(
                    "<span>%s: %.2f</span>",
                    column.label, aggregation[column.field]))
                .appendTo($footer);
        });
    }
    // TODO: implement reorder (drag and drop rows)
});
openerp.base.ListView.List = Class.extend( /** @lends openerp.base.ListView.List# */{
    /**
     * List display for the ListView, handles basic DOM events and transforms
     * them in the relevant higher-level events, to which the list view (or
     * other consumers) can subscribe.
     *
     * Events on this object are registered via jQuery.
     *
     * Available events:
     *
     * `selected`
     *   Triggered when a row is selected (using check boxes), provides an
     *   array of ids of all the selected records.
     * `deleted`
     *   Triggered when deletion buttons are hit, provide an array of ids of
     *   all the records being marked for suppression.
     * `action`
     *   Triggered when an action button is clicked, provides two parameters:
     *
     *   * The name of the action to execute (as a string)
     *   * The id of the record to execute the action on
     * `row_link`
     *   Triggered when a row of the table is clicked, provides the index (in
     *   the rows array) and id of the selected record to the handle function.
     *
     * @constructs
     * @param {Object} opts display options, identical to those of :js:class:`openerp.base.ListView`
     */
    init: function (opts) {
        var self = this;

        this.options = opts.options;
        this.columns = opts.columns;
        this.dataset = opts.dataset;
        this.rows = opts.rows;

        this.$_element = $('<tbody class="ui-widget-content">')
            .appendTo(document.body)
            .delegate('th.oe-record-selector', 'click', function (e) {
                e.stopPropagation();
                var selection = self.get_selection();
                $(self).trigger(
                        'selected', [selection.ids, selection.records]);
            })
            .delegate('td.oe-record-delete button', 'click', function (e) {
                e.stopPropagation();
                var $row = $(e.target).closest('tr');
                $(self).trigger('deleted', [[self.row_id($row)]]);
            })
            .delegate('td.oe-field-cell button', 'click', function (e) {
                e.stopPropagation();
                var $target = $(e.currentTarget),
                      field = $target.closest('td').data('field'),
                  record_id = self.row_id($target.closest('tr'));

                $(self).trigger('action', [field, record_id]);
            })
            .delegate('tr', 'click', function (e) {
                e.stopPropagation();
                $(self).trigger(
                    'row_link',
                    [self.row_position(e.currentTarget),
                     self.row_id(e.currentTarget),
                     self.dataset]);
            });
    },
    render: function () {
        if (this.$current) {
            this.$current.remove();
        }
        this.$current = this.$_element.clone(true);
        this.$current.empty().append($(QWeb.render('ListView.rows', this)));
    },
    /**
     * Gets the ids of all currently selected records, if any
     * @returns {Object} object with the keys ``ids`` and ``records``, holding respectively the ids of all selected records and the records themselves.
     */
    get_selection: function () {
        if (!this.options.selectable) {
            return [];
        }
        var rows = this.rows;
        var result = {ids: [], records: []};
        this.$current.find('th.oe-record-selector input:checked')
                .closest('tr').each(function () {
            var record = {};
            _(rows[$(this).prevAll().length].data).each(function (obj, key) {
                record[key] = obj.value;
            });
            result.ids.push(record.id);
            result.records.push(record);
        });
        return result;
    },
    /**
     * Returns the index of the row in the list of rows.
     *
     * @param {Object} row the selected row
     * @returns {Number} the position of the row in this.rows
     */
    row_position: function (row) {
        return $(row).prevAll().length;
    },
    /**
     * Returns the identifier of the object displayed in the provided table
     * row
     *
     * @param {Object} row the selected table row
     * @returns {Number|String} the identifier of the row's object
     */
    row_id: function (row) {
        return this.rows[this.row_position(row)].data.id.value;
    },
    /**
     * Death signal, cleans up list
     */
    apoptosis: function () {
        if (!this.$current) { return; }
        this.$current.remove();
        this.$current = null;
        this.$_element.remove();
    },
    get_records: function () {
        return _(this.rows).map(function (row) {
            var record = {};
            _(row.data).each(function (obj, key) {
                record[key] = obj.value;
            });
            return record;
        });
    }
    // drag and drop
    // editable?
});
openerp.base.ListView.Groups = Class.extend( /** @lends openerp.base.ListView.Groups# */{
    /**
     * Grouped display for the ListView. Handles basic DOM events and interacts
     * with the :js:class:`~openerp.base.DataGroup` bound to it.
     *
     * Provides events similar to those of
     * :js:class:`~openerp.base.ListView.List`
     */
    init: function (view) {
        this.view = view;
        this.options = view.options;
        this.columns = view.columns;
        this.datagroup = null;

        this.sections = [];
        this.children = {};
    },
    pad: function ($row) {
        if (this.options.selectable) {
            $row.append('<td>');
        }
    },
    make_fragment: function () {
        return document.createDocumentFragment();
    },
    /**
     * Returns a DOM node after which a new tbody can be inserted, so that it
     * follows the provided row.
     *
     * Necessary to insert the result of a new group or list view within an
     * existing groups render, without losing track of the groups's own
     * elements
     *
     * @param {HTMLTableRowElement} row the row after which the caller wants to insert a body
     * @returns {HTMLTableSectionElement} element after which a tbody can be inserted
     */
    point_insertion: function (row) {
        var $row = $(row);
        var red_letter_tboday = $row.closest('tbody')[0];

        var $next_siblings = $row.nextAll();
        if ($next_siblings.length) {
            var $root_kanal = $('<tbody>').insertAfter(red_letter_tboday);

            $root_kanal.append($next_siblings);
            this.elements.splice(
                _.indexOf(this.elements, red_letter_tboday),
                0,
                $root_kanal[0]);
        }
        return red_letter_tboday;
    },
    open_group: function (e, group) {
        var row = e.currentTarget;

        if (this.children[group.value]) {
            this.children[group.value].apoptosis();
            delete this.children[group.value];
        }
        var prospekt = this.children[group.value] = new openerp.base.ListView.Groups(this.view, {
            options: this.options,
            columns: this.columns
        });
        this.bind_child_events(prospekt);
        prospekt.datagroup = group;
        prospekt.render().insertAfter(
            this.point_insertion(row));
        $(row).find('span.ui-icon')
                .removeClass('ui-icon-triangle-1-e')
                .addClass('ui-icon-triangle-1-s');
    },
    /**
     * Prefixes ``$node`` with floated spaces in order to indent it relative
     * to its own left margin/baseline
     *
     * @param {jQuery} $node jQuery object to indent
     * @param {Number} level current nesting level, >= 1
     * @returns {jQuery} the indentation node created
     */
    indent: function ($node, level) {
        return $('<span>')
                .css({'float': 'left', 'white-space': 'pre'})
                .text(new Array(level).join('   '))
                .prependTo($node);
    },
    render_groups: function (datagroups) {
        var self = this;
        var placeholder = this.make_fragment();
        _(datagroups).each(function (group) {
            var $row = $('<tr>');
            if (group.openable) {
                $row.click(function (e) {
                    if (!$row.data('open')) {
                        $row.data('open', true);
                        self.open_group(e, group);
                    } else {
                        $row.removeData('open')
                            .find('span.ui-icon')
                                .removeClass('ui-icon-triangle-1-s')
                                .addClass('ui-icon-triangle-1-e');
                        _(self.children).each(function (child) {child.apoptosis();});
                    }
                });
            }
            placeholder.appendChild($row[0]);

            var $group_column = $('<th>').appendTo($row);
            if (group.grouped_on) {
                // Don't fill this if group_by_no_leaf but no group_by
                $group_column
                    .text((group.value instanceof Array ? group.value[1] : group.value));
                if (group.openable) {
                    // Make openable if not terminal group & group_by_no_leaf
                    $group_column
                        .prepend('<span class="ui-icon ui-icon-triangle-1-e" style="float: left;">');
                }
            }
            self.indent($group_column, group.level);
            // count column
            $('<td>').text(group.length).appendTo($row);
                    
            self.pad($row);
            _(self.columns).chain()
                .filter(function (column) {return !column.invisible;})
                .each(function (column) {
                    if (column.meta) {
                        // do not do anything
                    } else if (column.id in group.aggregates) {
                        var value = group.aggregates[column.id];
                        var format;
                        if (column.type === 'integer') {
                            format = "%.0f";
                        } else if (column.type === 'float') {
                            format = "%.2f";
                        }
                        $('<td>')
                            .text(_.sprintf(format, value))
                            .appendTo($row);
                    } else {
                        $row.append('<td>');
                    }
                });
        });
        return placeholder;
    },
    bind_child_events: function (child) {
        var $this = $(this),
             self = this;
        $(child).bind('selected', function (e) {
            // can have selections spanning multiple links
            var selection = self.get_selection();
            $this.trigger(e, [selection.ids, selection.records]);
        }).bind('action', function (e, name, id, callback) {
            if (!callback) {
                callback = function () {
                    var $prev = child.$current.prev();
                    if (!$prev.is('tbody')) {
                        // ungrouped
                        $(self.elements[0]).replaceWith(self.render());
                    } else {
                        // ghetto reload child (and its siblings)
                        $prev.children().last().click();
                    }
                };
            }
            $this.trigger(e, [name, id, callback]);
        }).bind('deleted row_link', function (e) {
            // additional positional parameters are provided to trigger as an
            // Array, following the event type or event object, but are
            // provided to the .bind event handler as *args.
            // Convert our *args back into an Array in order to trigger them
            // on the group itself, so it can ultimately be forwarded wherever
            // it's supposed to go.
            var args = Array.prototype.slice.call(arguments, 1);
            $this.trigger.call($this, e, args);
        });
    },
    render_dataset: function (dataset) {
        var rows = [],
            list = new openerp.base.ListView.List({
                options: this.options,
                columns: this.columns,
                dataset: dataset,
                rows: rows
            });
        this.bind_child_events(list);

        var d = new $.Deferred();
        dataset.read_slice(
            _.filter(_.pluck(this.columns, 'name'), _.identity),
            0, false,
            function (records) {
                var form_records = _(records).map(function (record) {
                    // TODO: colors handling
                    var form_data = {},
                      form_record = {data: form_data};

                    _(record).each(function (value, key) {
                        form_data[key] = {value: value};
                    });

                    return form_record;
                });

                rows.splice(0, rows.length);
                rows.push.apply(rows, form_records);
                list.render();
                d.resolve(list);
            });
        return d.promise();
    },
    render: function (post_render) {
        var self = this;
        var $element = $('<tbody>');
        this.elements = [$element[0]];
        this.datagroup.list(function (groups) {
            $element[0].appendChild(
                self.render_groups(groups));
            if (post_render) { post_render(); }
        }, function (dataset) {
            self.render_dataset(dataset).then(function (list) {
                self.children[null] = list;
                self.elements =
                    [list.$current.replaceAll($element)[0]];
                if (post_render) { post_render(); }
            });
        });
        return $element;
    },
    /**
     * Returns the ids of all selected records for this group, and the records
     * themselves
     */
    get_selection: function () {
        var ids = [], records = [];

        _(this.children)
            .each(function (child) {
                var selection = child.get_selection();
                ids.push.apply(ids, selection.ids);
                records.push.apply(records, selection.records);
            });

        return {ids: ids, records: records};
    },
    apoptosis: function () {
        _(this.children).each(function (child) {
            child.apoptosis();
        });
        $(this.elements).remove();
        return this;
    },
    get_records: function () {
        return _(this.children).chain()
            .map(function (child) {
                return child.get_records();
            }).flatten().value();
    }
});
};

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