A simple update what I found.
I dig little bit more and I think this might be cause of this behaviour:

https://github.com/jeremyevans/sequel/blob/2392145025c60d3c127bc1b921130598409f249c/lib/sequel/adapters/shared/postgres.rb#L670

This only searches for indexes that have simple relation attributes.
On Tuesday, 30 March 2021 at 15:32:18 UTC+2 Robert Pawlas wrote:

>
> Or as well, how I use the index method might be a problem.
> On Tuesday, 30 March 2021 at 15:22:36 UTC+2 Robert Pawlas wrote:
>
>> Hello!
>>
>> I found problem during dumping schema with 
>>
>> DB.dump_schema_migration(same_db: true)
>>
>> The problem is indexes that include Sequel function as first parameter, 
>> are not being dumped.
>>
>> Here's sample index in create_table migration:
>>
>> Sequel.migration do
>>   change do
>>     create_table(:tests) do
>>        index Sequel.function(:lower, :name),
>>        name: :tests_unique_name_index,
>>         unique: true
>>      end
>>    end
>> end
>>
>> What I could find until now is that this method does not load all of the 
>> indexes from DB:
>>
>> https://github.com/jeremyevans/sequel/blob/2392145025c60d3c127bc1b921130598409f249c/lib/sequel/adapters/shared/postgres.rb#L648
>>
>> Best regards, 
>>
>> Robert
>>
>

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