romenigld
I was trying this command for generate a migration for many to many:
mix ecto.gen.migration create_albums_genre album_id:references:albums:unique genre_id:references:genres:unique
but I receive an error:
** (Mix) expected ecto.gen.migration to receive the migration file name, got: "create_albums_genre album_id:references:albums:unique genre_id:references:genres:unique"
I know is possible to use this references command because I used before. But for the generate not works!
Which kind of ecto commands it will be useful using this references by the mix terminal command?
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germsvel
I’m not a 100% sure, but I think you might be thinking of
mix phx.gen.schema. That one allows you to use things likename:string album_id:references:albums, etc.I always get those confused too. I find
mix help ecto.gen.migrationandmix help phx.gen.schemahelp me figure out what I can and cannot pass as options.romenigld
Yes. I just don’t understand why the other commands don’t have this.
It is so useful.
Thank you for reply @germsvel!
germsvel
That’s an excellent question. I wonder if it would be a nice contribution to Ecto?
romenigld
I think yes, it’s like more productive.
You create the migration thinking about what it will fill and we know this type of set is for this in other cases. I was thinking why not have the
--primary-key:falseor--pk:trueand as well by coomand.joey_the_snake
Generating a schema and generating a migration are 2 very different things. When you generate a schema you know you are doing a single
createaction. Migrations can be many different actions, with multiple actions in the same migration.For instance, you could create 5 tables. Should all of them have the same reference? Or you can be altering an index. Or modifying a column name.