replace all older rocket sign to new ":" from examples of active record ...

Those vars can be used in tasks, which not call load_config.

In commit d1d7c86d I moved setting migrations paths into activerecord's
railtie to remove Rails dependency on databases.rake. However, it
introduced a regression, ENGINE_PATH was not available at the moment, so
engine's migrations where not added properly to paths. Fix was added
at 97a4a771, but it changes a way things work from using ENGINE_PATH to
APP_RAKEFILE. Additionally, the config runs when the code loads, while
previously it ran in the db:load_config rake task

In order to make it more in pair with original version this commit
changes the config to run only on load_config task. This code uses the
fact that defining a task in rake does not overwrite, but only appends.

It also allows to get back to checking for ENGINE_PATH

Those two files are required by active_support/rails.rb
loaded in active_model.rb

It is common to require common dependencies on the root
files to avoid boilerplate in each file.

This reverts commit 763635e3, reversing
changes made to 4f46ef36.

Closes #11026

Add explicit dependencies of ActiveSupport to enable independent usage of ActiveModel::Name

flatten merged join_values before building the joins

There are two missing ActiveSupport dependencies to use ActiveModel::Name class or ActiveModel::Naming module independently.

Missing dependencies for Module#delegate defined in `active_support/core_ext/module/delegation`, used at [L148](https://github.com/rails/rails/blob/master/activemodel/lib/active_model/naming.rb#L148)

Missing dependencies for Object#blank? defined in `active_support/core_ext/object/blank`, used at [L131](https://github.com/rails/rails/blob/master/activemodel/lib/active_model/naming.rb#L131)

fixes #10669

While joining_values special treatment is given to string values.
By flattening the array it ensures that string values are detected
as strings and not arrays.

Remove code related to the rails test command

Remove the mention about this command in the rails command's help
message and remove the "t" alias related to it.

do not load all child records for inverse case

currently `post.comments.find(Comment.first.id)` would load all
comments for the given post to set the inverse association.

This has a huge performance penalty. Because if post has 100k
records and all these 100k records would be loaded in memory
even though the comment id was supplied.

Fix is to use in-memory records only if loaded? is true. Otherwise
load the records using full sql.

Fixes #10509

fix bad test by making number that fits for integer

PR https://github.com/rails/rails/pull/10566 had to be reverted
because after applying the fix test
"test_raise_record_not_found_error_when_invalid_ids_are_passed"
started failing.

In this test invalid_id is being assigned a really large number
which was causing following failure when PR #10566 was applied.

```
RangeError: bignum too big to convert into `long long'
SELECT  `interests`.* FROM `interests`
WHERE `interests`.`man_id` = ? AND `interests`.`id` = ?
LIMIT 1  [["man_id", 970345987], ["id", 2394823094892348920348523452345]]
```

This test is not failing in master because when test code
`man.interests.find(invalid_id)` is executed then interests
are fully loaded in memory and no database query is executed.

After PR #10566 was merged then test code
`man.interests.find(invalid_id)` started executing sql query
and hence the error.

In case someone is wondering why the second part of query is not
failing, then that's because the actual query does not require
any variable substituation where the number is large. In that
case the sql generate is following.

```
SELECT `interests`.* FROM `interests`
WHERE `interests`.`man_id` = ? AND `interests`.`id`
IN (8432342, 2390102913, 2453245234523452)  [["man_id", 970345987]]
```

 #10428: Added tests for config.assets.precompile

Fix documents for create_join_table [ci skip]

Saying gemcutter => rubygems [ci skip]

fix the path of action view from actionpack/lib/action_view => actionvie...

Backport #11033 to master

Since docrails as moved from lifo/docrails to rails/docrails we have
to ask for commit rights or submit patches directly to the rails
repository

Previously when app was mounted as following:

    class Foo
      def call(env)
        [200, {}, [env['PATH_INFO']]]
      end
    end

    RackMountRailsBug::Application.routes.draw do
      mount RackTest.new => "/foo"
    end

trailing slash was removed from PATH_INFO. For example requesting

    GET /foo/bar/

on routes defined above would result in a response containing "/foo/bar"
instead of "/foo/bar/".

This commit fixes the issue.

(closes #3215)

`inspect` for AR model classes does not initiate a new connection.

Fix BacktraceSilencer#noise when multiple silencers are configured

Extract ActionView to separate directory

Tests for bug in sprocket-rails:
  do not use value of configuration options
  which changed after environment loaded

Now if somebody by mistake will remove malformed files test will raise error.

The previous implementation of BacktraceSilencer#noise did not
work correctly if more than one silencer was configured --
specifically, it would only return noise which was matched by all
silencers.

The new implementation is such that anything that has been matched by
silencers is removed from the backtrace using Array#- (array
difference), ie. we now return all elements within a backtrace that
have been matched by any silencer (and are thus removed by #silence).

Fixes #11030.