fix(writepreredeem): fixed WritePools gorm issues

[cnlangzi]

Changes

Fixes

• fixed WritePools gorm issues #913

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #914 (e8d7599) into staging (670a2a3) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           staging     #914      +/-   ##
===========================================
+ Coverage    26.41%   26.43%   +0.02%     
===========================================
  Files           77       77              
  Lines         7883     7875       -8     
===========================================
  Hits          2082     2082              
+ Misses        5529     5521       -8     
  Partials       272      272              

Flag	Coverage Δ
Unit-Tests	26.43% <0.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ode/go/0chain.net/blobbercore/allocation/entity.go	0.00% <0.00%> (ø)
...et/blobbercore/handler/object_operation_handler.go	31.29% <0.00%> (ø)

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[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	FALSE
system-tests	master
gosdk	NOT OVERRIDDEN
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	fix/get_write_pool_gorm_issue
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	master
0proxy	staging
0search	staging

[dabasov]

lgtm