kaminari | Engine | Object-Relational Mapping library

I'm trying to revive an old Rails application I worked on several years ago. I'm using ruby 2.3.3 and rails 3.2.15 on the Heroku-16 stack with ClearDB for my MySQL database with the mysql2 adapter. When deploying to Heroku it succeeds on the deploy but crashes when it tries to start the app.

Full stack trace from the Heroku log (updated after fixing activerecord-import gem version per suggestion in first answer):

I want to implement file export to pdf in rails. but instead of the download option its redirecting to a view page http://localhost:3000/xmls?pdf=xml.pdf&template=xmls_controller%2Findex.html.erb

I have used render but an error was throwing that's why i used redirect_to

I am currently paginating the return of a query attendees that has over 9000 items. My pages and routing work fine but I would like them to appear at the bottom of the page as clickable links to that page of the results. I am relatively new at using JBuilder I am using the Kaminari gem as well as the API-Pagination gem and would like to know how to I add visible/clickable page numbers to a JBuilder view according to Kaminari Docs <%= paginate @attendees %> is all that is needed. But as far as I understand JBuilder does not work or interpret that logic as its purely manufacturing JSON objects? Any advice is appreciated as well as a better explanation of what JBuilder is doing.

I'm trying to run bundle install on my rails 6 app, but I can't successfully compile ffi:

I'm trying to deploy my Rails 5.0 on heroku after a bundle update. I'm blocked by an issue on assets:precompile

Say, I have users list on the '/users' page and 2 actions for the 'user' entity: 'index' (with using of Ajax) and 'destroy'.

I'm creating a Podcast page. It's almost done except for the tag filtering.

In the index file, all the list of podcasts is located at the bottom with all tag listed and clickable filter

I picked up a 4 year old project written in Ruby 2.1.3 and Rails 4.1.8.

Very few of the gems were versioned but I've managed to get the project running locally by installing mysql2 0.3.20 as suggested in multiple other threads. Doing this required me to (on MacOS) downgrade openssl and mysql with brew install mysql@57 and brew install openssl@10.

I could then install mysql2 with by passing the correct libraries to it: gem install mysql2 -v 0.3.20 -- --with-mysql-config=/usr/local/opt/mysql@5.7/bin/mysql_config --with-ldflags=-L/usr/local/opt/openssl@1.0/lib --with-cppflags=-I/usr/local/opt/openssl@1.0/include

Everything works locally, all good.

I'm trying to deploy this project with Dokku on a Debian instance. Here's the readout from the push to dokku master including the error thrown when starting the Rails server:

I am having difficulties to run rails server command because of the following error:

Specified 'sqlite3' for database adapter, but the gem is not loaded. Add gem 'sqlite3' to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError)

I found couple answers in Google (Changing Sqlite3 to Postgresql Rails, Ruby on Rails - “Add 'gem sqlite3'' to your Gemfile”, Add ‘gem sqlite3” to your Gemfile...) but none of these answers work for me. I tried to manually change gemfile.lock values, tried to run bundle commands but still getting the same error. Moreover, I do have sqlite3 in my gemfile under :development, :test group.

• Operation system: macOS Mojave Version 10.14.4 Beta
• sqlite3 version: 1.4.0
• pg version: 0.20

PS: I am using pg gem in order to use database on heroku.

Here is my gemfile, please note, some of the gems were deleted to make the list look smaller and cleaner: