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define(['underscore', 'backbone', 'backbone/pageable-collection', 'oro/app'],
function(_, Backbone, BackbonePageableCollection, app) {
'use strict';
/**
* Pageable collection
*
* Additional events:
* beforeReset: Fired when collection is about to reset data (e.g. after success response)
* updateState: Fired when collection state is updated using updateState method
* beforeFetch: Fired when collection starts to fetch, before request is formed
*
* @export oro/pageable-collection
* @class oro.PageableCollection
* @extends Backbone.PageableCollection
*/
var PageableCollection = BackbonePageableCollection.extend({
/**
* Basic model to store row data
*
* @property {Function}
*/
model: Backbone.Model,
/**
* Initial state of collection
*
* @property
*/
initialState: {},
/**
* Declaration of URL parameters
*
* @property {Object}
*/
queryParams: _.extend({}, BackbonePageableCollection.prototype.queryParams, {
directions: {
"-1": "ASC",
"1": "DESC"
},
totalRecords: undefined,
totalPages: undefined
}),
/**
* Object declares state keys that will be involved in URL-state saving with their shorthands
*
* @property {Object}
*/
stateShortKeys: {
currentPage: 'i',
pageSize: 'p',
sorters: 's',
filters: 'f',
gridName: 't',
gridView: 'v'
},
/**
* @property {Object}
*/
additionalParameters: {
view: 'gridView'
},
/**
* Whether multiple sorting is allowed
*
* @property {Boolean}
*/
multipleSorting: true,
/**
* Initialize basic parameters from source options
*
* @param models
* @param options
*/
initialize: function(models, options) {
this.state = {};
options = options || {};
if (options.state) {
if (options.state.sorters) {
_.each(options.state.sorters, function(direction, field) {
options.state.sorters[field] = this.getSortDirectionKey(direction);
}, this);
}
_.extend(this.state, options.state);
}
this.initialState = app.deepClone(this.state);
if (options.url) {
this.url = options.url;
}
Iif (options.model) {
this.model = options.model;
}
if (options.inputName) {
this.inputName = options.inputName;
}
_.extend(this.queryParams, {
currentPage: this.inputName + '[_pager][_page]',
pageSize: this.inputName + '[_pager][_per_page]',
sortBy: this.inputName + '[_sort_by][%field%]',
parameters: this.inputName + '[_parameters]'
});
this.on('remove', this.onRemove, this);
BackbonePageableCollection.prototype.initialize.apply(this, arguments);
},
/**
* Triggers when model is removed from collection.
*
* Ensure that state is changed after concrete model removed from collection.
*
* @protected
*/
onRemove: function() {
if (this.state.totalRecords > 0) {
this.state.totalRecords--;
}
},
/**
* Encode state object to string
*
* @param {Object} stateObject
* @return {String}
*/
encodeStateData: function(stateObject) {
var data = _.pick(stateObject, _.keys(this.stateShortKeys));
data.gridName = this.inputName;
data = app.invertKeys(data, this.stateShortKeys);
return app.packToQueryString(data);
},
/**
* Decode state object from string, operation is invert for encodeStateData.
*
* @param {String} stateString
* @return {Object}
*/
decodeStateData: function(stateString) {
var data = app.unpackFromQueryString(stateString);
data = app.invertKeys(data, _.invert(this.stateShortKeys));
return data;
},
/**
* Adds filter parameters to data
*
* @param {Object} data
* @param {Object} state
* @param {String} prefix
* @return {Object}
*/
processFiltersParams: function(data, state, prefix) {
if (!state) {
state = this.state;
}
if (!prefix) {
prefix = this.inputName + '[_filter]'
}
if (this.inputName &&
!_.isUndefined(data[this.inputName]) &&
!_.isUndefined(data[this.inputName]._filter)
) {
const scope = !_.isUndefined(data[this.inputName]._filter.scope) ?
data[this.inputName]._filter.scope :
null;
data[this.inputName]._filter = {};
if (null !== scope) {
data[this.inputName]._filter.scope = scope
}
}
if (state.filters) {
_.extend(
data,
this.generateParameterStrings(state.filters, prefix)
);
}
return data;
},
/**
* Adds additional parameters to state
*
* @param {Object} state
* @return {Object}
*/
processAdditionalParams: function (state) {
var state = app.deepClone(state);
state.parameters = state.parameters || {};
_.each(this.additionalParameters, _.bind(function(value, key) {
Iif (!_.isUndefined(state[value])) {
state.parameters[key] = state[value]
}
}, this));
return state;
},
/**
* Get list of request parameters
*
* @param {Object} parameters
* @param {String} prefix
* @return {Object}
*/
generateParameterStrings: function(parameters, prefix) {
var localStrings = {};
var localPrefix = prefix;
_.each(parameters, function(filterParameters, filterKey) {
filterKey = filterKey.toString();
if (filterKey.substr(0, 2) != '__') {
var filterKeyString = localPrefix + '[' + filterKey + ']';
if (_.isObject(filterParameters)) {
_.extend(
localStrings,
this.generateParameterStrings(filterParameters, filterKeyString)
);
} else {
localStrings[filterKeyString] = filterParameters;
}
}
}, this);
return localStrings;
},
/**
* Parse AJAX response
*
* @param resp
* @param options
* @return {Object}
*/
parse: function(resp, options) {
this.state.totalRecords = 'undefined' !== typeof(resp.totalRecords) ? resp.totalRecords : resp.options.totalRecords;
this.state = this._checkState(this.state);
return resp.data;
},
/**
* Reset collection object
*
* @param models
* @param options
*/
reset: function(models, options) {
this.trigger('beforeReset', this, options);
BackbonePageableCollection.prototype.reset.apply(this, arguments);
},
/**
* Updates and checks state
*
* @param {Object} state
*/
updateState: function(state) {
var newState = _.extend({}, this.state, state);
this.state = this._checkState(newState);
this.trigger('updateState', this, this.state);
},
/**
* @inheritDoc
*/
_checkState: function (state) {
var mode = this.mode;
var links = this.links;
var totalRecords = state.totalRecords;
var pageSize = state.pageSize;
var currentPage = (state.currentPage < 0) ? 1 : state.currentPage;
var firstPage = state.firstPage;
var totalPages = state.totalPages;
if (totalRecords != null && pageSize != null && currentPage != null &&
firstPage != null && (mode == "infinite" ? links : true)) {
state.totalRecords = totalRecords = this.finiteInt(totalRecords, "totalRecords");
state.pageSize = pageSize = this.finiteInt(pageSize, "pageSize");
state.currentPage = currentPage = this.finiteInt(currentPage, "currentPage");
state.firstPage = firstPage = this.finiteInt(firstPage, "firstPage");
Iif (pageSize < 0) {
throw new RangeError("`pageSize` must be >= 0");
}
state.totalPages = pageSize == 0 ? 1 : totalPages = state.totalPages = Math.ceil(totalRecords / pageSize);
Iif (firstPage < 0 || firstPage > 1) {
throw new RangeError("`firstPage` must be 0 or 1");
}
state.lastPage = firstPage === 0 ? totalPages - 1 : totalPages;
state.lastPage = state.lastPage < 0 ? 1 : state.lastPage;
// page out of range
if (currentPage > state.lastPage && state.pageSize > 0) {
state.currentPage = currentPage = state.lastPage;
}
Iif (state.pageSize == 0) {
state.currentPage = currentPage = 1;
}
// no results returned
if (totalRecords == 0) {
state.currentPage = currentPage = firstPage;
}
Iif (mode == "infinite") {
if (!links[currentPage + '']) {
throw new RangeError("No link found for page " + currentPage);
}
} else if (totalPages > 0) {
Iif (firstPage === 0 && (currentPage < firstPage || currentPage >= totalPages)) {
throw new RangeError("`currentPage` must be firstPage <= currentPage < totalPages if 0-based. Got " + currentPage + '.');
}
else Iif (firstPage === 1 && (currentPage < firstPage || currentPage > totalPages)) {
throw new RangeError("`currentPage` must be firstPage <= currentPage <= totalPages if 1-based. Got " + currentPage + '.');
}
} else Iif (currentPage !== firstPage ) {
throw new RangeError("`currentPage` must be " + firstPage + ". Got " + currentPage + '.');
}
}
return state;
},
/**
* Asserts that val is finite integer.
*
* @param {*} val
* @param {String} name
* @return {Number}
* @protected
*/
finiteInt: function(val, name) {
val *= 1;
Iif (!_.isNumber(val) || _.isNaN(val) || !_.isFinite(val) || ~~val !== val) {
throw new TypeError("`" + name + "` must be a finite integer");
}
return val;
},
/**
* Fetch collection data
*/
fetch: function (options) {
this.trigger('beforeFetch', this, options);
var BBColProto = Backbone.Collection.prototype;
options = options || {};
var state = this._checkState(this.state);
var mode = this.mode;
Iif (mode == "infinite" && !options.url) {
options.url = this.links[state.currentPage];
}
var data = options.data || {};
// set up query params
var url = options.url || _.result(this, "url") || '';
var qsi = url.indexOf('?');
Eif (qsi != -1) {
_.extend(data, app.unpackFromQueryString(url.slice(qsi + 1)));
url = url.slice(0, qsi);
}
options.url = url;
options.data = data;
data = this.processQueryParams(data, state);
data = this.processFiltersParams(data, state);
var fullCollection = this.fullCollection, links = this.links;
Iif (mode != "server") {
var self = this;
var success = options.success;
options.success = function (col, resp, opts) {
// make sure the caller's intent is obeyed
opts = opts || {};
if (_.isUndefined(options.silent)) delete opts.silent;
else opts.silent = options.silent;
var models = col.models;
var currentPage = state.currentPage;
if (mode == "client") resetQuickly(fullCollection, models, opts);
else if (links[currentPage]) { // refetching a page
var pageSize = state.pageSize;
var pageStart = (state.firstPage === 0 ?
currentPage :
currentPage - 1) * pageSize;
var fullModels = fullCollection.models;
var head = fullModels.slice(0, pageStart);
var tail = fullModels.slice(pageStart + pageSize);
fullModels = head.concat(models).concat(tail);
fullCollection.update(fullModels,
_.extend({silent: true, sort: false}, opts));
if (fullCollection.comparator) fullCollection.sort();
fullCollection.trigger("reset", fullCollection, opts);
}
else { // fetching new page
fullCollection.add(models, _.extend({at: fullCollection.length,
silent: true}, opts));
fullCollection.trigger("reset", fullCollection, opts);
}
if (success) success(col, resp, opts);
};
// silent the first reset from backbone
return BBColProto.fetch.call(self, _.extend({}, options, {silent: true}));
}
return BBColProto.fetch.call(this, options);
},
/**
* Process parameters which are sending to server
*
* @param {Object} data
* @param {Object} state
* @return {Object}
*/
processQueryParams: function(data, state) {
state = this.processAdditionalParams(state);
var pageablePrototype = PageableCollection.prototype;
// map params except directions
var queryParams = this.mode == "client" ?
_.pick(this.queryParams, "sorters") :
_.omit(_.pick(this.queryParams, _.keys(pageablePrototype.queryParams)), "directions");
var i, kvp, k, v, kvps = _.pairs(queryParams), thisCopy = _.clone(this);
for (i = 0; i < kvps.length; i++) {
kvp = kvps[i], k = kvp[0], v = kvp[1];
v = _.isFunction(v) ? v.call(thisCopy) : v;
if (state[k] != null && v != null) {
data[v] = state[k];
}
}
// set sorting parameters
Eif (state.sorters) {
_.each(state.sorters, function(direction, field) {
var key = this.queryParams.sortBy.replace('%field%', field);
data[key] = this.queryParams.directions[direction];
}, this);
}
// map extra query parameters
var extraKvps = _.pairs(_.omit(this.queryParams,
_.keys(pageablePrototype.queryParams)));
for (i = 0; i < extraKvps.length; i++) {
kvp = extraKvps[i];
v = kvp[1];
v = _.isFunction(v) ? v.call(thisCopy) : v;
data[kvp[0]] = v;
}
// unused parameters
delete data[queryParams.order];
delete data[queryParams.sortKey];
return data;
},
/**
* Convert direction value to direction key
*
* @param {String} directionValue
* @return {String}
*/
getSortDirectionKey: function(directionValue) {
var directionKey = null;
_.each(this.queryParams.directions, function(value, key) {
if (value == directionValue) {
directionKey = key;
}
});
return directionKey;
},
/**
* Set sorting order
*
* @param {String} sortKey
* @param {String} order
* @param {Object} options
* @return {*}
*/
setSorting: function (sortKey, order, options) {
var state = this.state;
state.sorters = state.sorters || {};
Iif (this.multipleSorting) {
// there is always must be at least one sorted column
if (_.keys(state.sorters).length <= 1 && !order) {
order = this.getSortDirectionKey("ASC"); // default order
}
// last sorting has the lowest priority
delete state.sorters[sortKey];
} else {
state.sorters = {};
}
Eif (order) {
state.sorters[sortKey] = order;
}
var fullCollection = this.fullCollection;
var delComp = false, delFullComp = false;
Iif (!order) delComp = delFullComp = true;
var mode = this.mode;
options = _.extend({side: mode == "client" ? mode : "server", full: true},
options
);
var comparator = this._makeComparator(sortKey, order);
var full = options.full, side = options.side;
Iif (side == "client") {
if (full) {
if (fullCollection) fullCollection.comparator = comparator;
delComp = true;
}
else {
this.comparator = comparator;
delFullComp = true;
}
}
else Iif (side == "server" && !full) {
this.comparator = comparator;
}
Iif (delComp) delete this.comparator;
Iif (delFullComp && fullCollection) delete fullCollection.comparator;
return this;
},
/**
* Clone collection
*
* @return {PageableCollection}
*/
clone: function() {
var collectionOptions = {};
collectionOptions.url = this.url;
collectionOptions.inputName = this.inputName;
var newCollection = new PageableCollection(this.toJSON(), collectionOptions);
newCollection.state = app.deepClone(this.state);
return newCollection;
}
});
return PageableCollection;
});
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