drf-paginator/cjs/query-handlers/page-number-query-handler.js

Module for consuming paginated Django REST framework endpoints.

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.PageNumberQueryHandler = undefined;

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _lodash = require('lodash');

var _lodash2 = _interopRequireDefault(_lodash);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var defaultOptions = {
  pageQueryParam: 'page'
};

var PageNumberQueryHandler = exports.PageNumberQueryHandler = function () {
  function PageNumberQueryHandler(options) {
    _classCallCheck(this, PageNumberQueryHandler);

    this._excessParams = null;
    this.setOptions(options);
  }

  _createClass(PageNumberQueryHandler, [{
    key: 'makeParams',
    value: function makeParams(page) {
      var queryParams = _lodash2.default.assign({}, this._excessParams);

      queryParams[this._options.pageQueryParam] = page;

      return queryParams;
    }
  }, {
    key: 'resolvePage',
    value: function resolvePage(queryParams) {
      return this._parse(queryParams).page;
    }
  }, {
    key: 'setParams',
    value: function setParams(queryParams) {
      var result = this._parse(queryParams);
      this._excessParams = result.excess;

      return this;
    }
  }, {
    key: 'setOptions',
    value: function setOptions(options) {
      this._options = _lodash2.default.assign({}, defaultOptions, options);

      return this;
    }
  }, {
    key: '_getExcess',
    value: function _getExcess(queryParams) {
      return _lodash2.default.omit(queryParams, [this._options.pageQueryParam]);
    }
  }, {
    key: '_parse',
    value: function _parse(queryParams) {
      var pageQueryParam = this._options.pageQueryParam;

      var defaults = { page: 0 };
      var result = _lodash2.default.assign({}, defaults);

      if (queryParams.hasOwnProperty(pageQueryParam)) {
        result.page = queryParams[pageQueryParam];
      }

      result.excess = this._getExcess(queryParams);

      return result;
    }
  }]);

  return PageNumberQueryHandler;
}();

exports.default = PageNumberQueryHandler;