Fix the langchain chat pydantic bug

[SimFG]

https://github.com/zilliztech/GPTCache/issues/525

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[codecov[bot]]

Codecov Report

Merging #538 (18dae36) into dev (f9456aa) will decrease coverage by 0.99%. Report is 2 commits behind head on dev. The diff coverage is 83.95%.

Additional details and impacted files

[](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech) ```diff @@ Coverage Diff @@ ## dev #538 +/- ## ========================================== - Coverage 93.90% 92.91% -0.99% ========================================== Files 96 97 +1 Lines 4017 4249 +232 ========================================== + Hits 3772 3948 +176 - Misses 245 301 +56 ``` | [Files Changed](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech) | Coverage Δ | | |---|---|---| | [gptcache/adapter/adapter.py](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech#diff-Z3B0Y2FjaGUvYWRhcHRlci9hZGFwdGVyLnB5) | `82.74% <ø> (-5.31%)` | :arrow_down: | | [gptcache/manager/scalar\_data/manager.py](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech#diff-Z3B0Y2FjaGUvbWFuYWdlci9zY2FsYXJfZGF0YS9tYW5hZ2VyLnB5) | `85.18% <33.33%> (-6.49%)` | :arrow_down: | | [gptcache/adapter/openai.py](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech#diff-Z3B0Y2FjaGUvYWRhcHRlci9vcGVuYWkucHk=) | `81.57% <41.66%> (-13.05%)` | :arrow_down: | | [gptcache/manager/scalar\_data/dynamo\_storage.py](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech#diff-Z3B0Y2FjaGUvbWFuYWdlci9zY2FsYXJfZGF0YS9keW5hbW9fc3RvcmFnZS5weQ==) | `95.16% <95.16%> (ø)` | | | [gptcache/adapter/langchain\_models.py](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech#diff-Z3B0Y2FjaGUvYWRhcHRlci9sYW5nY2hhaW5fbW9kZWxzLnB5) | `95.29% <100.00%> (+0.05%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/zilliztech/GPTCache/pull/538/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zilliztech)