diff --git a/plugins/rails/_rails b/plugins/rails/_rails
index ad7505506..6dc85d458 100644
--- a/plugins/rails/_rails
+++ b/plugins/rails/_rails
@@ -1,66 +1,624 @@
 #compdef rails
-#autoload
+# ------------------------------------------------------------------------------
+# Copyright (c) 2016 Github zsh-users - http://github.com/zsh-users
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of the zsh-users nor the
+#       names of its contributors may be used to endorse or promote products
+#       derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL ZSH-USERS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ------------------------------------------------------------------------------
+# Description
+# -----------
+#
+#  Completion script for Ruby on Rails (http://rubyonrails.org/).
+#
+# ------------------------------------------------------------------------------
+# Authors
+# -------
+#
+#  * Kazuya Takeshima (https://github.com/mitukiii)
+#
+# ------------------------------------------------------------------------------
 
-local -a _1st_arguments
-_1st_arguments=(
-    'generate:Generate new code (short-cut alias: "g")'
-    'console:Start the Rails console (short-cut alias: "c")'
-    'server:Start the Rails server (short-cut alias: "s")'
-    'dbconsole:Start a console for the database specified in config/database.yml (short-cut alias: "db")'
-    'new:Create a new Rails application. "rails new my_app" creates a new application called MyApp in "./my_app"'
-    'application:Generate the Rails application code'
-    'destroy:Undo code generated with "generate"'
 
-    'benchmarker:See how fast a piece of code runs'
-    'profiler:Get profile information from a piece of code'
-    'plugin:Install a plugin'
+_rails() {
+  local context state line curcontext="$curcontext"
 
-    'plugin new:Generates skeleton for developing a Rails plugin'
-    'runner:Run a piece of code in the application environment (short-cut alias: "r")'
-)
-
-_rails_generate_arguments() {
-    generate_arguments=(
-        assets
-        controller
-        decorator
-        generator
-        helper
-        integration_test
-        mailer
-        migration
-        model
-        observer
-        performance_test
-        plugin
-        resource
-        scaffold
-        scaffold_controller
-        session_migration
-        stylesheets
-        task
-    )
+  if (( CURRENT > 2 )); then
+    (( CURRENT-- ))
+    shift words
+    _call_function - "_rails_${words[1]}" || _nothing
+  else
+    __rails_commands
+  fi
 }
 
+__rails_commands() {
+  local context state line curcontext="$curcontext"
 
-_arguments \
-    '(--version)--version[show version]' \
-    '(--help)--help[show help]' \
-    '*:: :->subcmds' && return 0
+  local -a rails_options
+  __rails_setup_rails_options
 
-if (( CURRENT == 1 )); then
-  _describe -t commands "rails subcommand" _1st_arguments
-  return
-else
-  _files
-  return
-fi
+  _arguments -C \
+    $rails_options \
+    ': :->command'
 
-case "$words[1]" in
-  g|generate)
-    _rails_generate_arguments
-    _wanted generate_arguments expl 'all generate' compadd -a generate_arguments ;;
-  d|destroy)
-    _rails_generate_arguments
-    _wanted generate_arguments expl 'all generate' compadd -a generate_arguments ;;
-esac
+  case "$state" in
+    command)
+      local -a commands
+      local application_directory
+      __rails_setup_application_directory
+
+      if [ -n "$application_directory" ]; then
+        commands=(
+          {generate,g}'[Generate new code]'
+          {console,c}'[Start the Rails console]'
+          {server,s}'[Start the Rails server]'
+          {dbconsole,db}'[Start a console for the database specified in config/database.yml]'
+          application'[Generate the Rails application code]'
+          {destroy,d}'[Undo code generated with "generate"]'
+          benchmarker'[See how fast a piece of code runs]'
+          profiler'[Get profile information from a piece of code]'
+          plugin'[Install a plugin]'
+          {runner,r}'[Run a piece of code in the application environment]'
+          {test,t}'[Run tests]'
+        )
+      else
+        commands=(
+          new'[Create a new Rails application]'
+        )
+      fi
+
+      _values 'command' $commands
+      ;;
+  esac
+}
+
+__rails_setup_application_directory() {
+  application_directory="$(pwd)"
+
+  while [ -n "$application_directory" ]; do
+    if [ -f "${application_directory}/script/rails" -o -f "${application_directory}/bin/rails" ]; then
+      return
+    fi
+    application_directory="${application_directory%/*}"
+  done
+
+  application_directory=
+}
+
+__rails_setup_rails_options() {
+  rails_options=(
+    {-h,--help}'[Show this help message and quit]'
+    {-v,--version}'[Show Rails version number and quit]'
+  )
+}
+
+__rails_setup_runtime_options() {
+  runtime_options=(
+    '(-f --force)'{-f,--force}'[Overwrite files that already exist]'
+    '(-p --pretend)'{-p,--pretend}'[Run but do not make any changes]'
+    '(-q --quiet)'{-q,--quiet}'[Suppress status output]'
+    '(-s --skip)'{-s,--skip}'[Skip files that already exist]'
+  )
+}
+
+__rails_setup_generators_options() {
+  local -a runtime_options
+  __rails_setup_runtime_options
+
+  generators_options=(
+    $runtime_options
+    --skip-namespace'[Skip namespace (affects only isolated applications)]'
+    --old-style-hash"[Force using old style hash (:foo => 'bar') on Ruby >= 1.9]"
+  )
+}
+
+__rails_setup_model_generators_options() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  model_generators_options=(
+    $generators_options
+    '(-o --orm)'{-o,--orm=}'[Orm to be invoked]:orm'
+  )
+}
+
+__rails_setup_resource_generators_options() {
+  local -a model_generators_options
+  __rails_setup_model_generators_options
+
+  resource_generators_options=(
+    $model_generators_options
+    --force-plural'[Forces the use of a plural ModelName]'
+    --resource-route'[Indicates when to generate resource route]: :__rails_boolean'
+  )
+}
+
+__rails_boolean() {
+  _values 'boolean' 'true' 'false'
+}
+
+__rails_migration_fields() {
+  if compset -P '*:*:'; then
+    _values 'index' 'index' 'uniq'
+  else
+    if compset -P '*:'; then
+      _values -s ':' 'type' 'string' 'text' 'integer' 'float' 'decimal' 'datetime' 'timestamp' 'time' 'date' 'binary' 'boolean' 'references'
+    else
+      _guard '[[:alnum:]_]#' 'field'
+    fi
+  fi
+}
+
+_rails_generate() {
+  local context state line curcontext="$curcontext"
+
+  if (( CURRENT > 2 )); then
+    (( CURRENT-- ))
+    shift words
+    _call_function - "_rails_generate_${words[1]}" || _rails_generate_default
+  else
+    __rails_generate_commands
+  fi
+}
+
+_rails_g() {
+  _rails_generate
+}
+
+__rails_generate_commands() {
+  local context curcontext="$curcontext" update_policy
+
+  zstyle -s ":completion:${curcontext}:" cache-policy update_policy
+  if [ -z "$update_policy" ]; then
+    zstyle ":completion:${curcontext}:" cache-policy _rails_generate_commands_caching_policy
+  fi
+
+  local application_directory
+  __rails_setup_application_directory
+  local cache_name
+  cache_name="rails/${application_directory##*/}/all_generators"
+  if ! _retrieve_cache ${cache_name}; then
+    local -a all_generators
+    all_generators=($(_call_program rails_generators rails generate 2> /dev/null | awk '/^  [a-zA-Z_]+/{ print $1 }'))
+    _store_cache ${cache_name} all_generators
+  fi
+
+  local -a rails_generators
+  rails_generators=(${all_generators:#*:*})
+  _describe -t rails_generators 'rails generator' rails_generators
+
+  local -a -U namespaces
+  local namespace
+  local -a generators
+  namespaces=(${(R)${(M)all_generators:#*:*}%:*})
+  for namespace in $namespaces; do
+    generators=(${${(M)all_generators:#${namespace}:*}/:/\\:})
+    _describe -t ${namespace}_generators "${namespace/_/ } generator" generators
+  done
+}
+
+_rails_generate_commands_caching_policy() {
+  local application_directory
+  __rails_setup_application_directory
+
+  if [ "${application_directory}/Gemfile" -nt "$1" ]; then
+    return 0
+  fi
+
+  local -a oldp
+  oldp=( "$1"(Nmw+1) )
+  (( $#oldp ))
+}
+
+_rails_generate_default() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    '*:argument'
+}
+
+_rails_generate_assets() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    '(-j --javascripts)'{-j,--javascripts}'[Generate JavaScripts]: :__rails_boolean' \
+    '(-y --stylesheets)'{-y,--stylesheets}'[Generate Stylesheets]: :__rails_boolean' \
+    '(-je --javascript-engine)'{-je,--javascript-engine=}'[Engine for JavaScripts]:javascript engine' \
+    '(-se --stylesheet-engine)'{-se,--stylesheet-engine=}'[Engine for Stylesheets]:stylesheet engine' \
+    ': :_guard "^-*" "name"'
+}
+
+_rails_generate_controller() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    '(-e --template-engine)'{-e,--template-engine=}'[Template engine to be invoked]:template engine' \
+    '(-t --test-framework)'{-t,--test-framework=}'[Test framework to be invoked]:test framework' \
+    --helper'[Indicates when to generate helper]: :__rails_boolean' \
+    --assets'[Indicates when to generate assets]: :__rails_boolean' \
+    ': :_guard "^-*" "name"' \
+    '*: :_guard "^-*" "action"'
+}
+
+_rails_generate_generator() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    --namespace'[Namespace generator under lib/generators/name]: :__rails_boolean' \
+    ': :_guard "^-*" "name"'
+}
+
+_rails_generate_helper() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    '(-t --test-framework)'{-t,--test-framework=}'[Test framework to be invoked]:test framework' \
+    ': :_guard "^-*" "name"' \
+}
+
+_rails_generate_integration_test() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    --integration-tool='[Integration tool to be invoke]:integration tool' \
+    ': :_guard "^-*" "name"' \
+}
+
+_rails_generate_jbuilder() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    ': :_guard "^-*" "name"' \
+    '*: :__rails_migration_fields'
+}
+
+_rails_generate_mailer() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    '(-e --template-engine)'{-e,--template-engine=}'[Template engine to be invoked]:template engine' \
+    '(-t --test-framework)'{-t,--test-framework=}'[Test framework to be invoked]:test framework' \
+    ': :_guard "^-*" "name"' \
+    '*: :_guard "^-*" "method"'
+}
+
+_rails_generate_migration() {
+  local -a modelgenerators_options
+  __rails_setup_model_generators_options
+
+  _arguments \
+    $model_generators_options \
+    ': :_guard "^-*" "name"' \
+    '*: :__rails_migration_fields'
+}
+
+_rails_generate_model() {
+  _rails_generate_migration
+}
+
+_rails_generate_observer() {
+  local -a model_generators_options
+  __rails_setup_model_generators_options
+
+  _arguments \
+    $model_generators_options \
+    ': :_guard "^-*" "name"'
+}
+
+_rails_generate_performance_test() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    --performance-tool='[Performance tool to be invoked]:performance tool' \
+    ': :_guard "^-*" "name"' \
+}
+
+_rails_generate_resource() {
+  local context state line curcontext="$curcontext"
+
+  local -a resource_generators_options
+  __rails_setup_resource_generators_options
+
+  _arguments -C \
+    $resource_generators_options \
+    '(-c --resource-controller)'{-c,--resource-controller=}'[Resource controller to be invoked]:name' \
+    '(-a --actions)'{-a,--actions=}'[Actions for the resource controller]: :->actions' \
+    ': :->name' \
+    '*: :->fields'
+
+  if (( words[(I)(--actions=*|-a)] > 0 && words[(I)(--actions=*|-a)] == words[(I)-*] )); then
+    state=actions
+  fi
+
+  case "$state" in
+    actions)
+      _guard "[[:alnum:]_]#" "actions"
+      ;;
+    name)
+      _guard "^-*" "name"
+      ;;
+    fields)
+      __rails_migration_fields
+      ;;
+  esac
+}
+
+_rails_generate_scaffold() {
+  local -a resource_generators_options
+  __rails_setup_resource_generators_options
+
+  _arguments \
+    $resource_generators_options \
+    '(-y --stylesheets)'{-y,--stylesheets}'[Generate Stylesheets]: :__rails_boolean' \
+    '(-se --stylesheet-engine)'{-se,--stylesheet-engine=}'[Engine for Stylesheets]:stylesheet engine' \
+    '(-c --scaffold-controller)'{-c,--scaffold-controller=}'[Scaffold controller to be invoked]:name' \
+    --assets'[Indicates when to generate assets]:boolean:(true false)' \
+    ': :_guard "^-*" "name"' \
+    '*: :__rails_migration_fields'
+}
+
+_rails_generate_scaffold_controller() {
+  local -a model_generators_options
+  __rails_setup_model_generators_options
+
+  _arguments \
+    $model_generators_options \
+    '(-e --template-engine)'{-e,--template-engine=}'[Template engine to be invoked]:template engine' \
+    '(-t --test-framework)'{-t,--test-framework=}'[Test framework to be invoked]:test framework' \
+      --helper'[Indicates when to generate helper]: :__rails_boolean' \
+    ': :_guard "^-*" "name"'
+}
+
+_rails_generate_session_migration() {
+  local -a model_generators_options
+  __rails_setup_model_generators_options
+
+  _arguments \
+    $model_generators_options \
+    ': :_guard "^-*" "name"'
+}
+
+_rails_generate_task() {
+  local -a generators_options
+  __rails_setup_generators_options
+
+  _arguments \
+    $generators_options \
+    ': :_guard "^-*" "name"' \
+    '*: :_guard "^-*" "action"'
+}
+
+_rails_console() {
+  _arguments \
+    '(- *)'{-h,--help}'[Show this help message]' \
+    '(-s --sandbox)'{-s,--sandbox}'[Rollback database modifications on exit]' \
+    --debugger'[Enable ruby-debugging for the console]'
+}
+
+_rails_c() {
+  _rails_console
+}
+
+_rails_server() {
+  _arguments \
+    '(- *)'{-h,--help}'[Show this help message]' \
+    '(-p --port)'{-p,--port=}'[Runs Rails on the specified port]: :_guard "[[\:digit\:]]#" "port"' \
+    '(-b --binding)'{-b,--binding=}'[Binds Rails to the specified ip]:ip:_hosts' \
+    '(-c --config)'{-c,--config=}'[Use custom rackup configuration file]:file:_files -g "*.ru"' \
+    '(-d --daemon)'{-d,--daemon}'[Make server run as a Daemon]' \
+    '(-u --debugger)'{-u,--debugger}'[Enable ruby-debugging for the server]' \
+    '(-e --environment)'{-e,--environment=}'[Specifies the environment to run this server under (test/development/production)]:name:(test development production)' \
+    '(-P --pid)'{-P,--pid=}'[Specifies the PID file]:pid:_files -g "*.pid"'
+}
+
+_rails_s() {
+  _rails_server
+}
+
+_rails_dbconsole() {
+  _arguments \
+    '(- *)'--help'[Show this help message]' \
+    '(-p --include-password)'{-p,--include-password}'[Automatically provide the password from database.yml]' \
+    --mode'[Automatically put the sqlite3 database in the specified mode (html, list, line, column)]:mode:(html list line column)' \
+    --header
+}
+
+_rails_new() {
+  local context state line curcontext="$curcontext"
+
+  local _a rails_options runtime_options
+  __rails_setup_rails_options
+  __rails_setup_runtime_options
+
+  _arguments -C \
+    $rails_options \
+    $runtime_options \
+    '(-r --ruby)'{-r,--ruby=}'[Path to the Ruby binary of your choice]:path' \
+    '(-b --builder)'{-b,--builder=}'[Path to a application builder (can be a filesystem path or URL)]: :->path_or_url' \
+    '(-m --template)'{-m,--template=}'[Path to an application template (can be a filesystem path or URL)]: :->path_or_url' \
+    --skip-gemfile"[Don't create a Gemfile]" \
+    --skip-bundle"[Don't run bundle install]" \
+    '(-G --skip-git)'{-G,--skip-git}'[Skip Git ignores and keeps]' \
+    '(-O --skip-active-record)'{-O,--skip-active-record}'[Skip Active Record files]' \
+    '(-S --skip-sprockets)'{-S,--skip-sprockets}'[Skip Sprockets files]' \
+    '(-d --database)'{-d,--database=}'[Preconfigure for selected database]:database:(mysql oracle postgresql sqlite3 frontbase ibm_db sqlserver jdbcmysql jdbcsqlite3 jdbcpostgresql jdbc)' \
+    '(-j --javascript)'{-j,--javascript=}'[Preconfigure for selected JavaScript library]:javascript' \
+    '(-J --skip-javascript)'{-J,--skip-javascript}'[Skip JavaScript files]' \
+    --dev'[Setup the application with Gemfile pointing to your Rails checkout]' \
+    --edge'[Setup the application with Gemfile pointing to Rails repository]' \
+    '(-T --skip-test-unit)'{-T,--skip-test-unit}'[Skip Test::Unit files]' \
+    --old-style-hash"[Force using old style hash (:foo => 'bar') on Ruby >= 1.9]" \
+    ':app path:_directories'
+
+  case "$state" in
+    path_or_url)
+      _alternative \
+        'files:path:_files -g "*.rb"' \
+        'url:url:_urls'
+      ;;
+  esac
+}
+
+_rails_application() {
+  _rails_new
+}
+
+_rails_db() {
+  _rails_dbconsole
+}
+
+_rails_destroy() {
+  _rails_generate
+}
+
+_rails_d() {
+  _rails_destroy
+}
+
+_rails_benchmarker() {
+  _arguments \
+    '(- *)'{-h,--help}'[Show this help message]' \
+    '(-r --runs)'{-r,--runs}'[Number of runs]: :_guard "[[\:digit\:]]#" "number"' \
+    '(-o --output)'{-o,--output}'[Directory to use when writing the results]:directory:_directories' \
+    '(-m --metrics)'{-m,--metrics}'[Metrics to use]: :_values -s "," "metrics" "wall_time" "memory" "objects" "gc_runs" "gc_time"' \
+    '*: :_guard "^-*" "ruby code"'
+}
+
+_rails_profiler() {
+  _arguments \
+    '(- *)'{-h,--help}'[Show this help message]' \
+    '(-r --runs)'{-r,--runs}'[Number of runs]: :_guard "[[\:digit\:]]#" "number"' \
+    '(-o --output)'{-o,--output}'[Directory to use when writing the results]:directory:_directories' \
+    '(-m --metrics)'{-m,--metrics}'[Metrics to use]: :_values -s "," "metrics" "process_time" "memory" "objects"' \
+    '(-f --formats)'{-f,--formats}'[Formats to output to]: :_values -s "," "formats" "flat" "graph" "html" "call_tree" "call_stack"' \
+    '*: :_guard "^-*" "ruby code"'
+}
+
+_rails_plugin() {
+  local context state line curcontext="$curcontext"
+
+  if (( CURRENT > 2 )); then
+    (( CURRENT-- ))
+    shift words
+    _call_function - "_rails_plugin_${words[1]}" || _nothing
+  else
+    __rails_plugin_commands
+  fi
+}
+
+__rails_plugin_commands() {
+  _values 'plugin command' \
+    install'[Install plugin(s) from known repositories or URLs]' \
+    remove'[Uninstall plugins]' \
+    new
+}
+
+_rails_plugin_install() {
+  _arguments \
+    '(-x --externals)'{-x,--externals}'[Use svn:externals to grab the plugin. Enables plugin updates and plugin versioning]' \
+    '(-o --checkout)'{-o,--checkout}'[Use svn checkout to grab the plugin. Enables updating but does not add a svn:externals entry]' \
+    '(-e --export)'{-e,--export}'[Use svn export to grab the plugin. Exports the plugin, allowing you to check it into your local repository. Does not enable updates or add an svn:externals entry]' \
+    '(-q --quiet)'{-q,--quiet}'[Suppresses the output from installation. Ignored if -v is passed (rails plugin -v install ...)]' \
+    '(-r --revision)'{-r,--revision=}'[Checks out the given revision from subversion or git. Ignored if subversion/git is not used]:revision' \
+    '(-f --force)'{-f,--force}"[Reinstalls a plugin if it's already installed]" \
+    '*:plugin:_urls'
+}
+
+_rails_plugin_remove() {
+  local -a plugins
+
+  plugins=($(_call_program rails_plugins ls -1 vendor/plugins))
+
+  _describe -t plugins 'plugin' plugins
+}
+
+_rails_plugin_new() {
+  _rails_new
+}
+
+_rails_runner() {
+  local context state line curcontext="$curcontext"
+
+  _arguments -C \
+    '(- *)'{-h,--help}'[Show this help message]' \
+    '(-e --environment)'{-e,--environment=}'[Specifies the environment for the runner to operate under (test/development/production)]:name:(test development production)' \
+    ': :->code_or_path'
+
+  case "$state" in
+    code_or_path)
+      _alternative \
+        'files:filename:_files -g "*.rb"' \
+        'codes:ruby code:_guard "^-*" "ruby code"'
+      ;;
+  esac
+}
+
+_rails_r() {
+  _rails_runner
+}
+
+_rails_test() {
+  local context state line curcontext="$curcontext"
+
+  _arguments -C \
+    ': :->path'
+
+  case "$state" in
+    path)
+      _alternative \
+        'files:filename:_files -g "*.rb"'
+      ;;
+  esac
+}
+
+_rails_t() {
+  _rails_test
+}
+
+_rails "$@"
+
+# Local Variables:
+# mode: Shell-Script
+# sh-indentation: 2
+# indent-tabs-mode: nil
+# sh-basic-offset: 2
+# End:
+# vim: ft=zsh sw=2 ts=2 et