Miso Project - Dataset: CouchDB Parser

couchdb-parser.js

// Underscore utility
var _ = require("underscore");
// Miso library
var Miso = require("miso.dataset");

Miso.Parsers.Couchdb = function(data, options) {};

_.extend(Miso.Parsers.Couchdb.prototype, {
  parse: function(rows) {
    var columns, valueIsObject;
    var data = {};

    // No data to process
    if (!rows.length) {
      return { columns: [], data: {} };
    }

    // If doc property is present, use this as the value
    if (_.isObject(rows[0].doc)) {
      // Iterate over every row and swap the doc for the value
      _.each(rows, function(row) {
        // Swap the value for the document
        row.value = row.doc;
      });
    }

    // Set columns based off the first row.
    if (_.isObject(rows[0].value)) {
      columns = _.keys(rows[0].value);

      // Set this flag for assignment later on
      valueIsObject = true;

    // If the first row is not an object, use key/val
    } else {
      columns = ["key", "value"];
    }

    // Ensure each column has an array for data.
    _.each(columns, function(column) {
      data[column] = [];
    });

    // Iterate over every row and column and insert the data fetched
    // correctly.
    _.each(rows, function(row) {
      _.each(columns, function(column) {
        // Add to the respective column, if its not an object, use key/val
        data[column].push(valueIsObject ? row.value[column] : row[column]);
      });
    });

    // Expected format for dataset.
    return {
      columns: columns,
      data: data
    };
  }
});