How do you undo mix ash.codegen?
I added an attribute to my resource with allow_nil? false.
I ran mix ash.codegen add_entity_path and got resource_snapshots and migrations.
I get this error when running mix ash.migrate.
17:52:16.239 [info] alter table entities
** (Postgrex.Error) ERROR 23502 (not_null_violation) column "path" of relation "entities" contains null values
I tried changing allow_nil? true and ran mix ash.codegen add_entity_path_null, but I still get the same error.
Do I just delete the last two resource_snapshots and the migrations before running mix ash.codegen again?
I think this mistake comes from the Database. Basically you have at least 1 row in the DB where the attribute is has a nil value. You have to delete those records
Correct. You can, however if you want, undo the migrations as you described. We’re working on a tool for generating migrations that can be easily “undone” with mix ash.codegen --dev that tags the migrations as dev migrations. Then you can revert the dev migrations and delete them or you can “save” them with mix ash.codegen <a summary of all the changes>.
Until then, there is a script you can use to do it based off of the git changes:
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How do you revert dev migrations?
I just added a new attribute to a resource and ran mix ash.codegen –dev. Then when I ran the migration, they failed because of null values in that column. So I then added default: 0 to the attribute and ran mix ash.codegen –dev again. It generated a second dev migration on top of the first on that modified the column to add a default value. However the first migration still fails.
I just deleted both of those migrations and ran mix ash.codegen —dev again and it says no changes detected. So I’m thinking I did something wrong and there are now inconsistencies in the snapshot.
What is the correct way to revert?
Ah, I figured out my problem. I need to delete the _dev.json files from the snapshots too. My problem is that I added those files to my .gitignore so it was obvious to me that they were there.
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