CODEWITHSUNDEEP
ruby-on-railsrake
Ellen Spertus
Ellen Spertus

Reputation: 6805

Why does my rake file code run every time?

I would like for some code to run whenever an input file is changed. Here is what I wrote in seed.rake:

INPUT_FILE = 'input-file'
INPUT_FILE_PROCESSED = '.input-file-processed'

file INPUT_FILE_PROCESSED => [INPUT_FILE, :environment].flatten do
    # Expensive code omitted.
    touch INPUT_FILE_PROCESSED
end

task all: [INPUT_FILE_PROCESSED]

I thought this would run the expensive code only when INPUT_FILE was newer than INPUT_FILE_PROCESSED, but every time I run rake seed:all, the expensive code runs:

$ rake seed:all
[2 minutes pass]
$ ls -al  .input-file-processed input-file
Jul 18 14:56 .input-file-processed
Jul 18 14:12 input-file
$ rake seed:all
[2 minutes pass]
$ ls -al  .input-file-processed input-file
Jul 18 15:01 .input-file-processed
Jul 18 14:12 input-file

I am using rake 10.3.1.

Upvotes: 0

Views: 49

Answers (1)

Laurel
Laurel

Reputation: 66

The dependency on the :environment task screws up the file modification time dependency checking (I imagine this is because the :environment task is always run).

You can depend on just the file and then require the environment manually:

file INPUT_FILE_PROCESSED => INPUT_FILE do
  require_relative '../../config/environment'

Upvotes: 1

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