h1. Environment

fairly stock Redmine 4.1.1, in a docker environment.

  Redmine version                4.1.1.stable
  Ruby version                   2.6.6-p146 (2020-03-31) [x86_64-linux-musl]
  Rails version                  5.2.4.2
  Environment                    production
  Database adapter               SQLite
  Mailer queue                   ActiveJob::QueueAdapters::AsyncAdapter
  Mailer delivery                smtp
SCM:
  Subversion                     1.12.2
  Mercurial                      5.3.2
  Bazaar                         2.7.0
  Git                            2.24.3
  Filesystem                     
Redmine plugins:
  no plugin installed

h1. Steps to reproduce

create a first redmine project¶

create a simple issue¶

allow API access¶

try to POST to /time_entries.xml with Content-Type application/xml¶

    1
    1
    1
    2.0
    Additional implementation
    2020-10-28    

try to POST the same data in JSON to /time_entries.json with Content-Type application/json¶

{
    "project_id":"1",
    "issue_id":"1",
    "user_id":"1",
    "hours":"2.0",
    "comments":"Additional implementation",
    "spent_on":"2020-10-28"
}

try to POST the same data but with hours formatted as number to /time_entries.json with Content-Type application/json¶

{
    "project_id":"1",
    "issue_id":"1",
    "user_id":"1",
    "hours":2.0,
    "comments":"Additional implementation",
    "spent_on":"2020-10-28"
}

h1. What happens

in step 4, XML format, the time entry is created, returns with http 201
in step 5 and 6, JSON format, the endpoint returns with 422 Unprocessable Entity, complaining about

{
    "errors": [
        "Hours cannot be blank"
    ]
}

h1. Expected result

either step 5 or step 6 (or maybe both) should work, to be able to create a time entry using JSON-based REST API