caTUstrophy/backend: endpoints-regions.go; 10 LoC

Found a possible issue in [caTUstrophy/backend](https://www.github.com/caTUstrophy/backend) at [endpoints-regions.go](https://github.com/caTUstrophy/backend/blob/0ca9a5c5a1829a775b83296e34332b504be10bc2/endpoints-regions.go#L388-L397)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first issue it finds, so please do not limit your consideration to the contents of the below message.

>

[Click here to see the code in its original context.](https://github.com/caTUstrophy/backend/blob/0ca9a5c5a1829a775b83296e34332b504be10bc2/endpoints-regions.go#L388-L397)

Click here to show the 10 line(s) of Go which triggered the analyzer.

```go
for i, matching := range Matchings {

// Load in matching involved offer and request.
app.DB.Model(&matching).Related(&matching.Offer).Related(&matching.Request)
app.DB.Model(&matching.Offer).Related(&matching.Offer.User)
app.DB.Model(&matching.Request).Related(&matching.Request.User)

// Marshal it to outside representation and add it to response list.
model[i] = CopyNestedModel(matching, fieldsMatching).(map[string]interface{})
}

```

Click here to show extra information the analyzer produced.

```
No path was found through the callgraph that could lead to a function which writes a pointer argument.

No path was found through the callgraph that could lead to a function which passes a pointer to third-party code.

root signature {Model 1} was not found in the callgraph; reference was passed directly to third-party code
```

Leave a reaction on this issue to contribute to the project by classifying this instance as a **Bug** :-1:, **Mitigated** :+1:, or **Desirable Behavior** :rocket:
See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 0ca9a5c5a1829a775b83296e34332b504be10bc2

Start by reading endpoints-regions.go around lines 388-397 and the surrounding endpoint flow. Determine whether the range variable references passed to the database calls can escape or cause incorrect behavior, then classify the finding as a bug, mitigated issue, or desirable behavior; no test is named in the issue.

Written by the indexing model from the issue text.