Inventory dataset form: optional field gives json export error if left blank

When adding a resource in inventory dataset form, if the field "Format", which is marked optiojnal, is left blank, it gives an error during json export.

How to reproduce

add a resource to a dataset
choose "Link to a file" as the resource type, leave the format field blank.
export the datajson for the org.

Expected behavior

json is exported without error

Actual behavior

An error for the dataset during export,

'required': ['mediaType']

Sketch

User reported this issue. #5415 (comment)

to reproduce locally, you must include a url to a dataset that has no extension in the url and clear out format. when you do that, exporting the data.json will make a zip with an errorlog.txt that may look like this:

// errorlog.txt
2026-06-05 20:06:40,495 - ===================================================

Validation failed, best guess of error:

 'mediaType' is a required property

Failed validating 'required' in schema[0]['dependencies']['downloadURL']:
    {'properties': {'mediaType': {'anyOf': [{'pattern': '^[-\\w]+/[-\\w]+(\\.[-\\w]+)*([+][-\\w]+)?$',
                                             'type': 'string'},
                                            {'pattern': '^(\\[\\[REDACTED).*?(\\]\\])$',
                                             'type': 'string'}]}},
     'required': ['mediaType']}

On instance:
    {'@type': 'dcat:Distribution',
     'downloadURL': 'http://json-schema.org/draft-04/schema'}

For this dataset:


2026-06-05 20:06:40,498 - Dataset id=[ac1f331e-0de6-48f0-a949-9153e9b870a2], title=[test], organization=[top level publisher] omitted, reason above.

// error in terminal
ckan-1                | 2026-06-05 20:06:39,428 WARNI [ckanext.datajson.package2pod] Missing mediaType for resource in package ['ac1f331e-0de6-48f0-a949-9153e9b870a2']

this pr fixes it GSA/ckanext-datajson#164

all prs merged, I just need someone to login to inventory for me to verify the dataset http://json-schema.org/draft-04/schema will now successully export

@FuhuXia

verified it's fixed with @FuhuXia on prod

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Inventory dataset form: optional field gives json export error if left blank #5434

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Inventory dataset form: optional field gives json export error if left blank #5434

Description

How to reproduce

Expected behavior

Actual behavior

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cody-seibert-gsa commented on Jun 5, 2026

cody-seibert-gsa commented on Jun 9, 2026

cody-seibert-gsa commented on Jun 10, 2026

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