Log QueryLayer and LINQ expression at Debug level

[bkoelman]

The LINQ expression is logged using the AgileObjects.ReadableExpressions NuGet package. This is a light-up dependency, so it needs to be added explicitly to your project.

Example usage:

1. dotnet add package AgileObjects.ReadableExpressions

2. Enable debug logging in appsettings.json: "Logging:LogLevel:JsonApiDotNetCore.Repositories": "Debug"

3. Send HTTP request: GET /api/todoItems?include=owner,assignee,tags&filter=equals(priority,'High') HTTP/1.1

Output:

dbug: JsonApiDotNetCore.Repositories.EntityFrameworkCoreRepository[1436092168]
      QueryLayer: QueryLayer<TodoItem>
      {
        Include: assignee,owner,tags
        Filter: equals(priority,'High')
        Sort: priority,-modifiedAt
        Pagination: Page number: 1, size: 10
        Selection
        {
          FieldSelectors<TodoItem>
          {
            tags: QueryLayer<Tag>
            {
              Sort: id
              Pagination: Page number: 1, size: 10
            }
            owner: QueryLayer<Person>
            {
            }
            assignee: QueryLayer<Person>
            {
            }
          }
        }
      }

dbug: JsonApiDotNetCore.Repositories.EntityFrameworkCoreRepository[1122238841]
      Expression tree: [Microsoft.EntityFrameworkCore.Query.EntityQueryRootExpression]
          .AsNoTrackingWithIdentityResolution()
          .Include("Tags")
          .Include("Owner")
          .Include("Assignee")
          .Where(todoItem => todoItem.Priority == value)
          .OrderBy(todoItem => todoItem.Priority)
          .ThenByDescending(todoItem => todoItem.LastModifiedAt)
          .Take(value)
          .Select(
              todoItem => new TodoItem
              {
                  Id = todoItem.Id,
                  CreatedAt = todoItem.CreatedAt,
                  Description = todoItem.Description,
                  DurationInHours = todoItem.DurationInHours,
                  LastModifiedAt = todoItem.LastModifiedAt,
                  Priority = todoItem.Priority,
                  Tags = todoItem.Tags
                      .OrderBy(tag => tag.Id)
                      .Take(value)
                      .ToHashSet(),
                  Owner = todoItem.Owner,
                  Assignee = todoItem.Assignee
              })

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

Attention: Patch coverage is 76.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 90.76%. Comparing base (b6b56b0) to head (0ccfcc2).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...eries/QueryableBuilding/ExpressionTreeFormatter.cs	66.66%	2 Missing and 4 partials ⚠️
src/JsonApiDotNetCore/Middleware/TraceLogWriter.cs	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1732      +/-   ##
==========================================
- Coverage   90.78%   90.76%   -0.02%     
==========================================
  Files         467      468       +1     
  Lines       14616    14646      +30     
  Branches     2302     2308       +6     
==========================================
+ Hits        13269    13294      +25     
- Misses        917      918       +1     
- Partials      430      434       +4     

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