{"action":"created","comment":{"url":"https://api.github.com/repos/openstax/accounts/pulls/comments/26313518","id":26313518,"diff_hunk":"@@ -92,6 +92,24 @@ def index\n   end\n \n   ###############################################################\n+  # find_by_username\n+  ###############################################################\n+\n+  api :GET, '/application_users/username/:username',\n+      'Gets a single ApplicationUser with the specified username.'\n+  description <<-EOS\n+    #{json_schema(Api::V1::UserSearchRepresenter, include: :readable)}\n+  EOS\n+  def find_by_username\n+    application_user = ApplicationUser.includes(:user).joins(:user).where({\n+      :user           => { :username => params[:username] },\n+      :application_id => current_api_user.application.id\n+    }).first!\n+    OSU::AccessPolicy.require_action_allowed!(:read, current_api_user, application_user)\n+    respond_with [application_user], represent_with: Api::V1::ApplicationUsersRepresenter","path":"app/controllers/api/v1/application_users_controller.rb","position":35,"original_position":35,"commit_id":"3d4221b46e4f003d44dbfecb557b3e798f252260","original_commit_id":"3d4221b46e4f003d44dbfecb557b3e798f252260","user":{"login":"jpslav","id":1001691,"avatar_url":"https://avatars.githubusercontent.com/u/1001691?v=3","gravatar_id":"","url":"https://api.github.com/users/jpslav","html_url":"https://github.com/jpslav","followers_url":"https://api.github.com/users/jpslav/followers","following_url":"https://api.github.com/users/jpslav/following{/other_user}","gists_url":"https://api.github.com/users/jpslav/gists{/gist_id}","starred_url":"https://api.github.com/users/jpslav/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jpslav/subscriptions","organizations_url":"https://api.github.com/users/jpslav/orgs","repos_url":"https://api.github.com/users/jpslav/repos","events_url":"https://api.github.com/users/jpslav/events{/privacy}","received_events_url":"https://api.github.com/users/jpslav/received_events","type":"User","site_admin":false},"body":"Should be the singular representer `ApplicationUserRepresenter`, then also don't need to wrap the `application_user` in an array on the left there.","created_at":"2015-03-12T15:44:21Z","updated_at":"2015-03-12T15:44:21Z","html_url":"https://github.com/openstax/accounts/pull/137#discussion_r26313518","pull_request_url":"https://api.github.com/repos/openstax/accounts/pulls/137","_links":{"self":{"href":"https://api.github.com/repos/openstax/accounts/pulls/comments/26313518"},"html":{"href":"https://github.com/openstax/accounts/pull/137#discussion_r26313518"},"pull_request":{"href":"https://api.github.com/repos/openstax/accounts/pulls/137"}}},"pull_request":{"url":"https://api.github.com/repos/openstax/accounts/pulls/137","id":30103435,"html_url":"https://github.com/openstax/accounts/pull/137","diff_url":"https://github.com/openstax/accounts/pull/137.diff","patch_url":"https://github.com/openstax/accounts/pull/137.patch","issue_url":"https://api.github.com/repos/openstax/accounts/issues/137","number":137,"state":"open","locked":false,"title":"Add /application_users/find/username/:username endpoint","user":{"login":"nathanstitt","id":79566,"avatar_url":"https://avatars.githubusercontent.com/u/79566?v=3","gravatar_id":"","url":"https://api.github.com/users/nathanstitt","html_url":"https://github.com/nathanstitt","followers_url":"https://api.github.com/users/nathanstitt/followers","following_url":"https://api.github.com/users/nathanstitt/following{/other_user}","gists_url":"https://api.github.com/users/nathanstitt/gists{/gist_id}","starred_url":"https://api.github.com/users/nathanstitt/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nathanstitt/subscriptions","organizations_url":"https://api.github.com/users/nathanstitt/orgs","repos_url":"https://api.github.com/users/nathanstitt/repos","events_url":"https://api.github.com/users/nathanstitt/events{/privacy}","received_events_url":"https://api.github.com/users/nathanstitt/received_events","type":"User","site_admin":false},"body":"Intended for looking up a user's information when\r\nall that is known is the username.  Will perform an\r\nexact match against the username, without using\r\nsub-string search.\r\n\r\nIssue 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