On Sunday, July 7, 2019 at 9:05:13 PM UTC-7, Shunsuke Tamiya wrote:
>
> Hi Jeremy,
>
> I know how to insert values that are taken from another table when
> migrations.
>
> Sequel.migration do
> up do
> create_table(:slot, ignore_index_errors: false) do
> String :uuid, size: 45, null: false
> String :tenant_uuid, size: 45, null: false
> column :slot, 'smallint unsigned', null: false
> DateTime :created_at, default: Sequel.lit('CURRENT_TIMESTAMP'), null:
> false
> primary_key [:uuid, :tenant_uuid]
> end
> from(:slot).insert([:slot, :tenant_uuid], # This won't work because of no
> uuid!
> from(:tenants_users).select { [count(:tenant_uuid).as(:slot),
> :tenant_uuid] }.group_by(:tenant_uuid)) # I am guessing there must be a way
> to append uuid around here...
> end
> ...
> end
>
> However, what if I like to also add a new column, let's say uuid on slot
> which doesn't exist on tenants_users. So I have to dynamically generate
> uuids for slot table. The code above obviously not working due the reason.
> I tried a bunch of ways but none of them not working so far.
>
You would have to use a database function to generate a UUID, and select
that in the query. Or switch to using import and generating a UUID
manually for each row in Ruby.
Thanks,
Jeremy
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