We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
DNS Providers list doesn't  show type
In the DNS Providers list, there is a column for the provider type, but it's always empty.

Looking at the code, and the API requests, the issue seems to be with the dns_providers API call, which returns the list of all providers.

There should be a providerType value in the JSON, but it's not there. 

A quick glance at the `DnsProvidersNestedOutputSchema` shows that the value is called `providerType`, but in the database the field is called `provider_type` similar to `api_endpoint` which is called `api_endpoint` in the OutputSchema, so I guess, it's probably just mislabeled in the OutputSchema, and needs to be adjusted there, and maybe in the angular template.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `lemur/dns_providers/schemas.py`
Content:
```
1 from marshmallow import fields
2 
3 from lemur.common.fields import ArrowDateTime
4 from lemur.common.schema import LemurInputSchema, LemurOutputSchema
5 
6 
7 class DnsProvidersNestedOutputSchema(LemurOutputSchema):
8     __envelope__ = False
9     id = fields.Integer()
10     name = fields.String()
11     providerType = fields.String()
12     description = fields.String()
13     credentials = fields.String()
14     api_endpoint = fields.String()
15     date_created = ArrowDateTime()
16 
17 
18 class DnsProvidersNestedInputSchema(LemurInputSchema):
19     __envelope__ = False
20     name = fields.String()
21     description = fields.String()
22     provider_type = fields.Dict()
23 
24 
25 dns_provider_output_schema = DnsProvidersNestedOutputSchema()
26 
27 dns_provider_input_schema = DnsProvidersNestedInputSchema()
28
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/lemur/dns_providers/schemas.py b/lemur/dns_providers/schemas.py
--- a/lemur/dns_providers/schemas.py
+++ b/lemur/dns_providers/schemas.py
@@ -8,7 +8,7 @@
     __envelope__ = False
     id = fields.Integer()
     name = fields.String()
-    providerType = fields.String()
+    provider_type = fields.String()
     description = fields.String()
     credentials = fields.String()
     api_endpoint = fields.String()

{"golden_diff": "diff --git a/lemur/dns_providers/schemas.py b/lemur/dns_providers/schemas.py\n--- a/lemur/dns_providers/schemas.py\n+++ b/lemur/dns_providers/schemas.py\n@@ -8,7 +8,7 @@\n     __envelope__ = False\n     id = fields.Integer()\n     name = fields.String()\n-    providerType = fields.String()\n+    provider_type = fields.String()\n     description = fields.String()\n     credentials = fields.String()\n     api_endpoint = fields.String()\n", "issue": "DNS Providers list doesn't  show type\nIn the DNS Providers list, there is a column for the provider type, but it's always empty.\r\n\r\nLooking at the code, and the API requests, the issue seems to be with the dns_providers API call, which returns the list of all providers.\r\n\r\nThere should be a providerType value in the JSON, but it's not there. \r\n\r\nA quick glance at the `DnsProvidersNestedOutputSchema` shows that the value is called `providerType`, but in the database the field is called `provider_type` similar to `api_endpoint` which is called `api_endpoint` in the OutputSchema, so I guess, it's probably just mislabeled in the OutputSchema, and needs to be adjusted there, and maybe in the angular template.\n", "before_files": [{"content": "from marshmallow import fields\n\nfrom lemur.common.fields import ArrowDateTime\nfrom lemur.common.schema import LemurInputSchema, LemurOutputSchema\n\n\nclass DnsProvidersNestedOutputSchema(LemurOutputSchema):\n    __envelope__ = False\n    id = fields.Integer()\n    name = fields.String()\n    providerType = fields.String()\n    description = fields.String()\n    credentials = fields.String()\n    api_endpoint = fields.String()\n    date_created = ArrowDateTime()\n\n\nclass DnsProvidersNestedInputSchema(LemurInputSchema):\n    __envelope__ = False\n    name = fields.String()\n    description = fields.String()\n    provider_type = fields.Dict()\n\n\ndns_provider_output_schema = DnsProvidersNestedOutputSchema()\n\ndns_provider_input_schema = DnsProvidersNestedInputSchema()\n", "path": "lemur/dns_providers/schemas.py"}], "after_files": [{"content": "from marshmallow import fields\n\nfrom lemur.common.fields import ArrowDateTime\nfrom lemur.common.schema import LemurInputSchema, LemurOutputSchema\n\n\nclass DnsProvidersNestedOutputSchema(LemurOutputSchema):\n    __envelope__ = False\n    id = fields.Integer()\n    name = fields.String()\n    provider_type = fields.String()\n    description = fields.String()\n    credentials = fields.String()\n    api_endpoint = fields.String()\n    date_created = ArrowDateTime()\n\n\nclass DnsProvidersNestedInputSchema(LemurInputSchema):\n    __envelope__ = False\n    name = fields.String()\n    description = fields.String()\n    provider_type = fields.Dict()\n\n\ndns_provider_output_schema = DnsProvidersNestedOutputSchema()\n\ndns_provider_input_schema = DnsProvidersNestedInputSchema()\n", "path": "lemur/dns_providers/schemas.py"}]}