Feed Rethinkdb with scrapy

Question

I'm looking for a simple tutorial explaining how to write items to Rethinkdb from scrapy. The equivalent can be found for MongoDB here.

Answer 1

Here is a translation of "Write items to MongoDB" line for line with RethinkDB.

A couple notes:

• I'm not sure where crawler.settings are set.
• The scrapy docs say process_item's second param item can be an object or dict, so the .insert(dict(item)) cast/conversion is probably necessary.

---

import rethinkdb as r

class RethinkDBPipeline(object):

    table_name = 'scrapy_items'

    def __init__(self, rethinkdb_uri, rethinkdb_port, rethinkdb_db):
        self.rethinkdb_uri = rethinkdb_uri
        self.rethinkdb_port = rethinkdb_port
        self.rethinkdb_db = rethinkdb_db

    @classmethod
    def from_crawler(cls, crawler):
        return cls(
            rethinkdb_uri=crawler.settings.get('RETHINKDB_URI'),
            rethinkdb_db=crawler.settings.get('RETHINKDB_DATABASE', 'items')
        )

    def open_spider(self, spider):
        self.conn = r.connect(
            host = self.rethinkdb_uri, 
            port = self.rethinkdb_port,
            db = self.rethinkdb_db)

    def close_spider(self, spider):
        self.conn.close()

    def process_item(self, item, spider):
        r.table(self.table_name).insert(dict(item)).run(self.conn)
        return item