Reading/writing xarray with mongodb

xarray_and_mongodb.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import xarray\n",
    "import pymongo\n",
    "\n",
    "import xarray_mongodb\n",
    "\n",
    "import zarr"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "db = pymongo.MongoClient('localhost')['mydb']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<xarray.DataArray (x: 2)>\n",
       "array([1, 2])\n",
       "Coordinates:\n",
       "  * x        (x) <U2 'x1' 'x2'\n",
       "Attributes:\n",
       "    units:    foo"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a = xarray.DataArray([1, 2], dims=['x'], coords={'x': ['x1', 'x2']}, attrs={'units': 'foo'})\n",
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "xdb = xarray_mongodb.XarrayMongoDB(db)\n",
    "_id, _ = xdb.put(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<xarray.DataArray (x: 2)>\n",
       "array([1, 2])\n",
       "Coordinates:\n",
       "  * x        (x) <U2 'x1' 'x2'"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "xdb.get(_id)\n",
    "# loses attrinbutes?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<xarray.backends.zarr.ZarrStore at 0x119a70410>"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "store = zarr.MongoDBStore('localhost')\n",
    "a.to_dataset(name='a').to_zarr(store, mode='w')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<xarray.DataArray 'a' (x: 2)>\n",
       "dask.array<zarr, shape=(2,), dtype=int64, chunksize=(2,), chunktype=numpy.ndarray>\n",
       "Coordinates:\n",
       "  * x        (x) <U2 'x1' 'x2'\n",
       "Attributes:\n",
       "    units:    foo"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "xarray.open_zarr(store)['a']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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