Google AutoML Ruby Gem Tables: Invalid String to assign to submessage field '' - ruby-on-rails

Question

I'm trying to use the AutoML prediction service from the Ruby gem google-cloud-automl and I keep getting errors. I already have a deployed model working with the online predictions.
Here is my current code:
payload = {
row: {
column_spec_ids: %w(COLUMN_NUMBER_1 COLUMN_NUMBER_2 COLUMN_NUMBER_3 COLUMN_NUMBER_4),
values: [
DATA_1,
DATA_2,
DATA_3,
DATA_4
]
}
}
client = Google::Cloud::AutoML::Prediction.new(version: :v1beta1)
response = client.predict(formatted_model_path, payload)
and I receive this error:
Google::Protobuf::TypeError: Invalid type String to assign to submessage field ''.
from path/to/my/vendor/bundle/ruby/2.5.0/gems/google-gax-1.8.1/lib/google/gax/util.rb:65:in `initialize'
(In my code, COLUMN_NUMBER_1 to _4 are actually real ID ant DATA_1 to _4 are strings)
formatted_model_path is the path of my model. I was able to access an NLP model earlier with this code (I only updated the payload format)
I've already tried to generate a Google::Cloud::AutoML::V1beta1::Row . I'm able to fill the column_spec_ids but every time I try this code
request = Google::Cloud::AutoML::V1beta1::Row.new
request.values = payload[:row][:values]
I get this error
Google::Protobuf::TypeError: Expected repeated field array
from (pry):4:in `method_missing'

Answer 1

I actually found the solution...
You need to provide the kind of data you are passing.
Instead of
values: [
DATA_1,
DATA_2,
DATA_3,
DATA_4
]
I should have
values: [
{string_value: DATA_1},
{string_value: DATA_2},
{string_value: DATA_3},
{string_value: DATA_4}
]
(and you can have string_value, number_value and some other kind, i think the full list is here)