Fix export csv

[paperplate]

Summary by CodeRabbit

• Bug Fixes

  • Corrected transaction amount formatting in CSV exports to display accurate currency values with proper decimal precision.

• Tests

  • Added test coverage for the CSV export endpoint to validate format accuracy and response headers.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR updates transaction CSV export to derive the amount field from amount_cents converted to dollars with two-decimal formatting, replacing the prior amount_dollars reference. A test is added to verify the /api/transactions/export endpoint returns a valid CSV response with the correct headers and data.

Changes

Transaction CSV Export Amount Formatting

Layer / File(s)	Summary
CSV export amount formatting with test validation JustAnotherExpenseManager/routes/transactions.py, tests/test_routes.py	The export_transactions endpoint now formats the "amount" CSV column by dividing amount_cents by 100 with two-decimal precision instead of using amount_dollars. The new test test_export_transactions_csv verifies the endpoint returns status 200, the correct CSV attachment header, and expected column/data in the response.

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🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	❓ Inconclusive	The title 'Fix export csv' is vague and generic, using non-descriptive terms that don't convey the specific nature of the change.	Consider a more specific title such as 'Fix CSV export amount formatting to use cents-to-dollars conversion' to clearly indicate what was fixed.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch push-znlklqlqnloy

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[coderabbitai]

🧹 Nitpick comments (1)

tests/test_routes.py (1)

123-129: ⚡ Quick win

Assert the exported amount format explicitly.

This test validates CSV presence but not the new cents→dollars formatting behavior. Add an assertion that exported amount values are two-decimal strings.

Proposed test hardening

 def test_export_transactions_csv(self, client, sample_transactions):
     response = client.get('/api/transactions/export')
     assert response.status_code == 200
     assert response.headers['Content-Disposition'].startswith('attachment; filename=')
     assert b'description,amount,type,category,date,tags' in response.data
     assert b'Restaurant' in response.data
+    import csv
+    from io import StringIO
+    rows = list(csv.DictReader(StringIO(response.data.decode('utf-8'))))
+    assert rows, "Expected at least one exported transaction row"
+    for row in rows:
+        whole, dot, frac = row['amount'].partition('.')
+        assert dot == '.' and len(frac) == 2 and whole.isdigit()

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@tests/test_routes.py` around lines 123 - 129, In
test_export_transactions_csv, add an assertion that the exported CSV's amount
column uses two-decimal dollar formatting by parsing response.data (or decoding
to text) and verifying the amount fields match a two-decimal pattern (e.g. regex
like ^\d+\.\d{2}$) for one or more sample rows from the CSV produced by the
sample_transactions fixture; update the test_export_transactions_csv function to
extract the CSV rows from response.data and assert the amount strings conform to
the two-decimal format.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@tests/test_routes.py`:
- Around line 123-129: In test_export_transactions_csv, add an assertion that
the exported CSV's amount column uses two-decimal dollar formatting by parsing
response.data (or decoding to text) and verifying the amount fields match a
two-decimal pattern (e.g. regex like ^\d+\.\d{2}$) for one or more sample rows
from the CSV produced by the sample_transactions fixture; update the
test_export_transactions_csv function to extract the CSV rows from response.data
and assert the amount strings conform to the two-decimal format.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 44620ae5-92f0-4f75-a8b4-aff56cf3460f

📥 Commits

Reviewing files that changed from the base of the PR and between 940b14b and 107cbcb.

📒 Files selected for processing (2)

• JustAnotherExpenseManager/routes/transactions.py
• tests/test_routes.py