Unintentionally makes `--webpack` implied on `rails new apper`.

If passed `--webpack` Thor assigns `"webpack"` to `options[:webpack]`,
so we can check for that instead of `"base"`.

https://bugs.ruby-lang.org/issues/12979

BigDecimal('an invalid string') has changed its behavior to raise an ArgumentError since 1.3.0
https://bugs.ruby-lang.org/issues/10286

namespace_ladder can be nil here

Don't expect the caller of this method to know that the return value has an extra "  "

Add a changelog entry for #26687 [ci skip]

Remove duplicated line

Add a changelog entry for #25227 [ci skip]

Fix CI failure caused by #25227 and #25280 were merged at the same time

Prevent `RangeError` for `belongs_to` associations

Translate numeric value out of range to the specific exception

run `webpack` command only when webpack option is specified

This fixes the following error when executing rails new command.

```
(erb):9:in `block in template': undefined method `comment' for nil:NilClass (NoMethodError)
```

Follow up to #27288

Add a changelog entry for #25451 [ci skip]

When content type header is blank we were raising an exception because
`empty?` was being called on nil.

Idempotent option for after_commit :destroy callback

Race conditions can occur when an ActiveRecord is destroyed
twice or destroyed and updated. The callbacks should only be
triggered once, similar to a SQL database trigger.

remove deprecated `assert_send` from assertion list [ci skip]

`assert_send` was deprecated in minitest 5.10.0.
Ref: https://github.com/seattlerb/minitest/commit/f95ef007ec64d956d88fedc37fd2ed7e106b777e

Follow up to 0d20530e

Enable `block` variable in view

If a Error object was serialized in the database as YAML in the Rails
4.2 version, if we load in the Rails 5.0 version it will miss the
@details instance variable so methods like #clear and #add will start to
fail.

Fix test breaking error uninitialized constant ActiveRecord::Type::Value