Sinatra + Chartkick + Sequel gem，图表未更新

Question

I'm running a very basic Sinatra server, which simply shows a Chartkick graph of some data I have through the Sequel gem. I'm noticing that the data on the chart doesn't seem to update unless I quit the Sinatra server script and rerun it. I don't really understand how that would be possible... the only non-normal thing option I'm using when reading my database using Sequel is the read-only option.. would that cause this?

Answer 1

It turns out, from reading another post on here:

First, by default, multiple processes can have the same SQLite database open at the same time, and several read accesses can be satisfied in parallel.

In case of writing, a single write to the database locks the database for a short time, nothing, even reading, can access the database file at all.

Beginning with version 3.7.0, a new “Write Ahead Logging” (WAL) option is available, in which reading and writing can proceed concurrently.

By default, WAL is not enabled. To turn WAL on, refer to the SQLite documentation.

I currently have script A, which maintains a connection to the DB file and writes to it regularly, and script B, which is my Sinatra server that reads information from that DB file. I worked around this issue by using a block connection in my Sinatra script. I don't know how to turn on WAL with Sequel though...