Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1151220
Description of problem:
Clients must submit a nested hash of attributes to certain API URLs.

For example, POSTing this data to the `/architectures` URL will succeed:

{'name': 'foo'}

However, these operating system IDs will be silently ignored:

{'name': 'foo', 'operatingsystem_ids': [1, 2, 3]}

A client can hack around this oddity by wrapping submitted data inside an extra hash:

{'architecture': {'name': 'foo', 'operatingsystem_ids': [1, 2, 3]}}

This extra hash should not be necessary. It makes the API harder to use, and the extra hash is only required for some API calls.

Version-Release number of selected component (if applicable):
This was tested against a system running Satellite 6.0.4, running the following software:

• candlepin-0.9.23-1.el7.noarch
• candlepin-common-1.0.1-1.el7.noarch
• candlepin-guice-3.0-2_redhat_1.el7.noarch
• candlepin-scl-1-5.el7.noarch
• candlepin-scl-quartz-2.1.5-6.el7.noarch
• candlepin-scl-rhino-1.7R3-3.el7.noarch
• candlepin-scl-runtime-1-5.el7.noarch
• candlepin-selinux-0.9.23-1.el7.noarch
• candlepin-tomcat-0.9.23-1.el7.noarch
• elasticsearch-0.90.10-6.el7sat.noarch
• foreman-1.6.0.46-1.el7sat.noarch
• foreman-compute-1.6.0.46-1.el7sat.noarch
• foreman-gce-1.6.0.46-1.el7sat.noarch
• foreman-libvirt-1.6.0.46-1.el7sat.noarch
• foreman-ovirt-1.6.0.46-1.el7sat.noarch
• foreman-postgresql-1.6.0.46-1.el7sat.noarch
• foreman-proxy-1.6.0.30-1.el7sat.noarch
• foreman-selinux-1.6.0.14-1.el7sat.noarch
• foreman-vmware-1.6.0.46-1.el7sat.noarch
• katello-1.5.0-30.el7sat.noarch
• katello-certs-tools-1.5.6-1.el7sat.noarch
• katello-default-ca-1.0-1.noarch
• katello-installer-0.0.64-1.el7sat.noarch
• katello-server-ca-1.0-1.noarch
• openldap-2.4.39-3.el7.x86_64
• pulp-katello-0.3-4.el7sat.noarch
• pulp-nodes-common-2.4.1-0.7.beta.el7sat.noarch
• pulp-nodes-parent-2.4.1-0.7.beta.el7sat.noarch
• pulp-puppet-plugins-2.4.1-0.7.beta.el7sat.noarch
• pulp-puppet-tools-2.4.1-0.7.beta.el7sat.noarch
• pulp-rpm-plugins-2.4.1-0.7.beta.el7sat.noarch
• pulp-selinux-2.4.1-0.7.beta.el7sat.noarch
• pulp-server-2.4.1-0.7.beta.el7sat.noarch
• python-ldap-2.4.6-6.el7.x86_64
• ruby193-rubygem-net-ldap-0.3.1-3.el7sat.noarch
• ruby193-rubygem-runcible-1.1.0-2.el7sat.noarch

How reproducible:
100%, but only for some URLs. The following URLs are currently known to require this workaround:

• architectures
• media
• operatingsystems

Steps to Reproduce:
See "description of problem" at top of bug report.

Actual results:
An extra hash is required.

Expected results:
No extra hash is required.

Additional info:
The following is taken from the log file. It shows what the server receives when processing a POST call to `/api/v2/architectures`.

Processing by Api::V2::ArchitecturesController#create as JSON
      Parameters: {"name"=>"<U+FA685>\u{BCF6F}