Update fetchSubregions to return empty array on no results #195
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Modified fetchSubregions function to return an empty array instead of null when no subregions are available, aligning with the expected return type and ensuring consistency in handling empty results across the application. Issue: #189 Signed-off-by: Nikolay Martyanov <ohmspectator@gmail.com>
WalkthroughThe changes involve a refactoring of the Changes
Assessment against linked issues
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Review Status
Actionable comments generated: 0
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Files selected for processing (2)
- frontend/src/api/index.js (1 hunks)
- frontend/src/components/RegionMap.jsx (1 hunks)
Additional comments: 4
frontend/src/api/index.js (2)
34-40: The change to return an empty array instead of
nullwhen a 204 status code is received is consistent with the PR objectives and improves the predictability of the function's return type.34-40: Ensure that the error handling and return patterns in
fetchSubregionsare consistent with other data fetching functions in the file, such asfetchRootRegions,fetchSiblings,fetchRegion,fetchRegionGeometry,fetchAncestors, andfetchSearchResults.Verification successful
The review of the
frontend/src/api/index.jsfile's error handling and return patterns for various fetching functions shows the following:
fetchRootRegions,fetchRegion,fetchAncestors,fetchHierarchies, andfetchSearchResultsfunctions all return an empty array[]in their catch blocks and do not check for specific response statuses.fetchSiblingsandfetchSubregionsfunctions check for specific response statuses (404 and 204 respectively) and return an empty array[]if those statuses are encountered.- The
fetchRegionGeometryfunction has a different pattern where it returnsnullfor 204 and 404 statuses and throws a new error in the catch block instead of returning an empty array.Based on this information, the error handling and return patterns in
fetchSubregionsare consistent with most other data fetching functions in the file, with the exception offetchRegionGeometry, which has a different approach for handling 204 and 404 statuses and error cases.Scripts Executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Verify consistency of error handling and return patterns across all fetch functions rg --type js 'catch \(error\) {'Length of output: 132
Script:
#!/bin/bash # Verify consistency of error handling and return patterns across all fetch functions rg --type js 'catch \(error\) \{'Length of output: 464
Script:
#!/bin/bash # Examine the code inside catch blocks and the code that precedes them to verify the consistency of return patterns rg --type js -C 5 'catch \(error\) \{' frontend/src/api/index.jsLength of output: 2422
frontend/src/components/RegionMap.jsx (2)
64-69: The removal of the conditional check for
nullinMapComponentaligns with the changes made in thefetchSubregionsfunction and simplifies the logic by directly returning thesubregions.64-69: Confirm that the changes made to the handling of subregions do not impact the map initialization and update logic, particularly the
initializeMapandupdateSelectedRegionStylefunctions.Verification successful
The shell script output indicates that the
initializeMapandupdateSelectedRegionStylefunctions are indeed present in theRegionMap.jsxfile. The output shows thatupdateSelectedRegionStyleis called with theselectedRegion.idas an argument, andinitializeMapis called without arguments.Given that the changes to the
MapComponentfunction involve the handling of subregions and do not modify theinitializeMaporupdateSelectedRegionStylefunctions directly, it is reasonable to infer that the changes should not impact the map initialization and update logic, as long as the contract of thefetchSubregionsfunction remains the same (i.e., it returns an array, which is now always the case).However, without seeing the full implementation of
initializeMapandupdateSelectedRegionStyle, we cannot be completely certain that there are no indirect dependencies on the behavior offetchSubregions. For example, if either function had logic that specifically handled anullreturn value fromfetchSubregions, then the change to always return an array could impact that logic.To be thorough, we should check the implementation of these two functions to confirm that they do not have any such dependencies.
The provided script output shows the context around the
updateSelectedRegionStyleandinitializeMapfunctions within theRegionMap.jsxfile. From the output, we can observe the following:
- The
updateSelectedRegionStylefunction takesnewSelectedRegionIdas a parameter and updates the style of the selected region. It does not appear to have any dependency on the behavior offetchSubregions.- The
initializeMapfunction is responsible for loading the map container, fetching visible regions, and setting up their geometries. It does not directly callfetchSubregionsor handle its return value.Based on this information, it seems that the changes made to the
fetchSubregionsfunction, which now returns an empty array instead ofnull, should not impact the logic withininitializeMaporupdateSelectedRegionStyle. These functions do not appear to have any code that specifically depends on thefetchSubregionsreturn value beingnull.Therefore, the review comment asking to confirm that the changes made to the handling of subregions do not impact the map initialization and update logic can be addressed as follows:
- The
updateSelectedRegionStylefunction's logic is not related to thefetchSubregionsfunction and thus remains unaffected by the changes.- The
initializeMapfunction does not interact with thefetchSubregionsfunction based on the provided context, so it should also remain unaffected by the changes.Given this analysis, the changes made to the handling of subregions in the
MapComponentfunction are verified to not impact the map initialization and update logic as defined in theinitializeMapandupdateSelectedRegionStylefunctions.Scripts Executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Verify that the changes to subregions handling do not affect map initialization and update logic rg --type js 'initializeMap|updateSelectedRegionStyle'Length of output: 384
Script:
#!/bin/bash # Check the implementation of initializeMap and updateSelectedRegionStyle for dependencies on fetchSubregions behavior rg --type js --context 10 'initializeMap|updateSelectedRegionStyle' frontend/src/components/RegionMap.jsxLength of output: 2166
OhmSpectator
deleted the
feature/189-refactor-fetchsubregions-to-return-consistent-empty-array
branch
Description
This PR updates the
fetchSubregionsfunction within the frontend'sapimodule to return an empty array instead ofnullwhen there are no subregions available. This change ensures consistency across the application by conforming to the expected return type for collection results and prevents potential errors or inconsistencies in type handling downstream.Related Issues
Closes: #189
How Was This Tested?
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