Form works in development but not production - Heroku - ruby-on-rails

Question

I have a voting platform that I'm building for my company and I am very close to finishing it but the actual voting is failing while in production. I've done all my migrating and everything, and it's still working in development.
Here are the logs I'm receiving from heroku:
2019-01-11T18:33:59.235681+00:00 app[web.1]: I,
[2019-01-11T18:33:59.235579 #4] INFO -- :
[772bc37c-00ee-43da-aa81-564d353553bb] Started POST
"/ballots/13/votes" for 75.150.214.2 at 2019-01-11 18:33:59 +0000
2019-01-11T18:33:59.236373+00:00 app[web.1]: I,
[2019-01-11T18:33:59.236296 #4] INFO -- :
[772bc37c-00ee-43da-aa81-564d353553bb] Processing by
VotesController#create as HTML 2019-01-11T18:33:59.236437+00:00
app[web.1]: I, [2019-01-11T18:33:59.236378 #4] INFO -- :
[772bc37c-00ee-43da-aa81-564d353553bb] Parameters: {"utf8"=>"✓",
"authenticity_token"=>"Y/vAh2kYPskozS2yQn3Ky1fOq41abLUjlxho0Q+zXHSndVlaSfwYz7bdoqvintdBXrYNDhsbIduYICpUAx3/0g==",
"user_vote"=>"Why", "vote"=>{"comment"=>""}, "commit"=>"Cast Vote",
"ballot_id"=>"13"} 2019-01-11T18:33:59.239540+00:00 app[web.1]: D,
[2019-01-11T18:33:59.239464 #4] DEBUG -- :
[772bc37c-00ee-43da-aa81-564d353553bb] Ballot Load (0.7ms) SELECT
"ballots".* FROM "ballots" WHERE "ballots"."id" = $1 LIMIT $2 [["id",
13], ["LIMIT", 1]] 2019-01-11T18:33:59.240333+00:00 app[web.1]: I,
[2019-01-11T18:33:59.240244 #4] INFO -- :
[772bc37c-00ee-43da-aa81-564d353553bb] Completed 500 Internal Server
Error in 4ms (ActiveRecord: 0.7ms) 2019-01-11T18:33:59.240846+00:00
app[web.1]: F, [2019-01-11T18:33:59.240770 #4] FATAL -- :
[772bc37c-00ee-43da-aa81-564d353553bb]
2019-01-11T18:33:59.240917+00:00 app[web.1]: F,
[2019-01-11T18:33:59.240847 #4] FATAL -- :
[772bc37c-00ee-43da-aa81-564d353553bb]
ActiveModel::UnknownAttributeError (unknown attribute 'comment' for
Vote.):' '2019-01-11T18:33:59.240981+00:00 app[web.1]: F,
[2019-01-11T18:33:59.240914 #4] FATAL -- :
[772bc37c-00ee-43da-aa81-564d353553bb]
2019-01-11T18:33:59.241051+00:00 app[web.1]: F,
[2019-01-11T18:33:59.240987 #4] FATAL -- :
[772bc37c-00ee-43da-aa81-564d353553bb]
app/controllers/votes_controller.rb:10:in `create'
2019-01-11T18:34:07.533587+00:00 heroku[run.2070]: State changed from
up to complete bobby#bobby-Al
Here's my code for vote create
def create
#ballot = Ballot.find(params[:ballot_id])
#vote = #ballot.votes.new(user_vote: params[:user_vote], comment: params[:vote][:comment])
#vote.user_id = current_user.id
if !current_user.votes.find_by(ballot_id: params[:ballot_id])
#vote.save
redirect_to ballot_path(params[:ballot_id])
else
flash[:alert] = "You've already voted on this ballot"
redirect_to ballot_path(params[:ballot_id])
end
end

Answer 1

It seems like a migration problem, just make sure to run your migrations for the environment production on heroku like this:
heroku run rake db:migrate
Restart your app
heroku restart --app my_app_name
Important
If you generate a migration that creates a table and make a push to heroku, to add another column to that table you shouldn't modify that one, instead you should create another one for that.
When you run rake db:migrate, rails register that on the table schema_migrations, so if you modify a migrate that is already registered is not going to be executed again. This could be the case, check directly on your database and see if the column is there.