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Simon Landaverde

Hello,

I am trying to add custom CSS to a PDF Report that I have created. I just wanted to know the proper way of doing this. I have been able to successfully apply my CSS to the PDF report but when testing the installation of the module on a new build I get many errors during testing.

How I included my CSS in the Manifest:

'assets' : {

        'web.report_assets_common' : [

            'my_module/static/src/css/style.css' ,

        ],

    }

Errors I get:

FAIL: TestReportsRendering.test_layout Traceback (most recent call last): File "/home/odoo/src/odoo/odoo/addons/base/tests/test_reports.py", line 367, in test_layout self.assertEqual( AssertionError: Lists differ: [['LT[82 chars]Page:', '/ 1', '1'], ['LTFigure', 'Some header[76 chars]'1']] != [['LT[82 chars]Page: 1 / 1'], ['LTFigure', 'Some header Text'[64 chars] 1']]

FAIL: TestReportsRendering.test_pdf_render_page_overflow Traceback (most recent call last): File "/home/odoo/src/odoo/odoo/addons/base/tests/test_reports.py", line 458, in test_pdf_render_page_overflow self.assertEqual(len(pages), 6, AssertionError: 4 != 6 : 6 pages are expected, 3 per record (you may ensure `nb_lines` has a correct value to generate an oveflow)

FAIL: TestReportsRendering.test_report_pdf_page_break Traceback (most recent call last): File "/home/odoo/src/odoo/odoo/addons/base/tests/test_reports.py", line 442, in test_report_pdf_page_break self.assertEqual(pages_contents, expected_pages_contents) AssertionError: Lists differ: [['LT[82 chars]Page:', '/ 2', '1'], ['LTFigure', 'Some header[306 chars]'2']] != [['LT[82 chars]Page: 1 / 2'], ['LTFigure', 'Some header Text'[282 chars] 2']] 

FAIL: TestReportsRendering.test_thead_tbody_repeat Traceback (most recent call last): File "/home/odoo/src/odoo/odoo/addons/base/tests/test_reports.py", line 521, in test_thead_tbody_repeat self.assertEqual(len(pages), 6, '6 pages are expected, 3 per record (you may ensure `nb_lines` has a correct value to generate an oveflow)') AssertionError: 4 != 6 : 6 pages are expected, 3 per record (you may ensure `nb_lines` has a correct value to generate an oveflow) 

These errors are only present when I have my CSS loaded in my manifest. Any guidance would be much appreciated.

Thanks,
Simon

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Odiware Technologies
Best Answer

You're really close! The issue you're hitting is common when adding custom CSS to Odoo PDF reports via web.report_assets_common. While it works visually, it can break PDF rendering tests if the CSS introduces layout shifts, changes margins, or affects pagination.

✅ Best Practice for Custom PDF CSS in Odoo:

Instead of injecting your styles in web.report_assets_common, which affects all reports and test cases globally, you should isolate your CSS to only your specific report.

✅ Solution (Recommended Approach):

Use the report_layout asset bundle only within your report QWeb template, like this:

1. Keep CSS in your module:

plaintext
CopyEdit
my_module/static/src/css/my_report.css

2. Do NOT add it to web.report_assets_common in the manifest.

3. Instead, load it in your QWeb template like this:

xml
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<t t-name="my_module.my_report_template">
    <t t-call="web.html_container">
        <t t-call-assets="web.report_assets_common" t-js="false"/>
        <t t-call-assets="my_module.assets_report" t-js="false"/>

        <!-- Your report content -->
    </t>
</t>

4. Define the custom asset bundle in __manifest__.py:

python
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'assets': {
    'my_module.assets_report': [
        'my_module/static/src/css/my_report.css',
    ],
}

✅ Why This Works:

  • Keeps the CSS scoped only to your report.
  • Prevents global test failures like test_layout and test_page_break, which are sensitive to CSS overflow or layout changes.
  • Ensures future compatibility across Odoo versions and PDF engines like wkhtmltopdf or weasyprint.

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