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We then define a global `Filter` object whose +// goal is to filter complete documents by using the local filters for each +// fields. + +// Use a "set" filter for a field that is a set of documents uniquely +// identified. For instance `{ labels: ['labelA', 'labelC', 'labelD'] }`. +var SetFilter = function() { + this._dep = new Tracker.Dependency(); + this._selectedElements = []; +}; + +_.extend(SetFilter.prototype, { + isSelected: function(val) { + this._dep.depend(); + return this._selectedElements.indexOf(val) > -1; + }, + + add: function(val) { + if (this.indexOfVal(val) === -1) { + this._selectedElements.push(val); + this._dep.changed(); + } + }, + + remove: function(val) { + var indexOfVal = this._indexOfVal(val); + if (this.indexOfVal(val) !== -1) { + this._selectedElements.splice(indexOfVal, 1); + this._dep.changed(); + } + }, + + toogle: function(val) { + var indexOfVal = this._indexOfVal(val); + if (indexOfVal === -1) { + this._selectedElements.push(val); + } else { + this._selectedElements.splice(indexOfVal, 1); + } + + this._dep.changed(); + }, + + reset: function() { + this._selectedElements = []; + this._dep.changed(); + }, + + _indexOfVal: function(val) { + return this._selectedElements.indexOf(val); + }, + + _isActive: function() { + this._dep.depend(); + return this._selectedElements.length !== 0; + }, + + _getMongoSelector: function() { + this._dep.depend(); + return { $in: this._selectedElements }; + } +}); + +// The global Filter object. +// XXX It would be possible to re-write this object more elegantly, and removing +// the need to provide a list of `_fields`. We also should move methods into the +// object prototype. +Filter = { + // XXX I would like to rename this field into `labels` to be consistent with + // the rest of the schema, but we need to set some migrations architecture + // before changing the schema. + labelIds: new SetFilter(), + members: new SetFilter(), + + _fields: ['labelIds', 'members'], + + // We don't filter cards that have been added after the last filter change. To + // implement this we keep the id of these cards in this `_exceptions` fields + // and use a `$or` condition in the mongo selector we return. + _exceptions: [], + _exceptionsDep: new Tracker.Dependency(), + + isActive: function() { + var self = this; + return _.any(self._fields, function(fieldName) { + return self[fieldName]._isActive(); + }); + }, + + getMongoSelector: function() { + var self = this; + + if (! self.isActive()) + return {}; + + var filterSelector = {}; + _.forEach(self._fields, function(fieldName) { + var filter = self[fieldName]; + if (filter._isActive()) + filterSelector[fieldName] = filter._getMongoSelector(); + }); + + var exceptionsSelector = {_id: {$in: this._exceptions}}; + this._exceptionsDep.depend(); + + return {$or: [filterSelector, exceptionsSelector]}; + }, + + reset: function() { + var self = this; + _.forEach(self._fields, function(fieldName) { + var filter = self[fieldName]; + filter.reset(); + }); + self.resetExceptions(); + }, + + addException: function(_id) { + if (this.isActive()) { + this._exceptions.push(_id); + this._exceptionsDep.changed(); + } + }, + + resetExceptions: function() { + this._exceptions = []; + this._exceptionsDep.changed(); + } +}; + +Blaze.registerHelper('Filter', Filter); -- cgit v1.2.3-1-g7c22