I'm trying to replicate the results on checking if a specific record exists. I happen to have a model in a project called Project. I did the following in my console:

irb(main):016> p1 = Project.find(13)
  Project Load (0.7ms)  SELECT "projects".* FROM "projects" WHERE "projects"."id" = $1 LIMIT $2  [["id", 13], ["LIMIT", 1]]
=> 
#<Project:0x000000010a7020a0
...
irb(main):017> p2 = Project.where(id: 13)
  Project Load (0.6ms)  SELECT "projects".* FROM "projects" WHERE "projects"."id" = $1 /* loading for pp */ LIMIT $2  [["id", 13], ["LIMIT", 11]]
=> 
[#<Project:0x000000010a70c820
...
irb(main):018> p1.present?
=> true
irb(main):019> p2.any?
  Project Exists? (0.8ms)  SELECT 1 AS one FROM "projects" WHERE "projects"."id" = $1 LIMIT $2  [["id", 13], ["LIMIT", 1]]
=> true

It looks to me like using find only executes one query once the object is in memory. Whereas where/any? seems to execute two queries. Did I misunderstand the point of the tip?

This tutorial was excellent, however I wanted to note something for future readers/watchers. I am using this on some PDFs of architectural plans. They are relatively large with very detailed text. I initially followed this video exactly, including using ImageMagick. The time to convert and process PDFs was okay locally but VERY slow in production. I'm using a cheap option on Render and don't want to pay for more while I get a product started. I was also already using Vips elsewhere in my app. On a whim, I decided to remove MiniMagick and use Vips (using ImageProcessing::Vips doesn't have a way to convert PDFs to image in a way I could get to work) to fix a slightly different problem. This cut my processing time down by a HUGE amount.

TL;DR: Use Vips instead of MiniMagick if you're finding that converting images are slow or the image quality is insufficient for your purposes.

Love this! I'm on render right now instead of Heroku but have been itching to try Kamal so I can move to Hetzner/DO.