gitignore: ignore file not working cakephp

Question

I have .gitignore file in my project, I want to ignore debug_kit.sqlite too I add this file in my .gitignore but still not working, when I rebase I have a conflit in this file. Auto-merging tmp/debug_kit.sqlite CONFLICT (content): Merge conflict in tmp/debug_kit.sqlite

this is .gitignore file:

# CakePHP 3
/vendor/*
/config/app.php

/tmp/cache/models/*
!/tmp/cache/models/empty
/tmp/cache/persistent/*
!/tmp/cache/persistent/empty
/tmp/cache/views/*
!/tmp/cache/views/empty
/tmp/sessions/*
!/tmp/sessions/empty
/tmp/tests/*
!/tmp/tests/empty
/tmp/debug_kit.sqlite

/logs/*
!/logs/empty

# CakePHP 2

/app/tmp/*
/app/Config/core.php
/app/Config/database.php
/vendors/*
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Answer 1

The .gitignore only affects files before they are added to Git. If a file has been added to the index already, then putting it in the gitignore after the fact makes no difference.

Delete the file from git first. Then the gitignore will keep it from being added again:

git rm --cached /tmp/debug_kit.sqlite