GraphQL Query string to LINQ Expression

Hi,

This library looks awesome. Apologies in advance if I’ve missed something here. I’ve spent some time looking through the examples on the front page but wasn’t sure how to do this. What I’m looking for is a way to retrieve a LINQ Expression from a GraphQL string query. This would be totally decoupled from EF or even IQueryable.

The delegate would look exactly like this:

delegate Expression GetExpression(string graphQl);

Or potentially this with generics:

delegate Expression<Func<T, bool>> GetExpression<T>(string graphQl);

Is there a straight forward way to implement this delegate with this library?

Christian

[lukemurray]

hey @MelbourneDeveloper , just looking at this now.

First you do not need to use DbContext you could build a schema from scratch from object type of a custom type like it looks like you have done. This library just builds LINQ expressions against an object structure. If that happens to be a DbContext then you get those benefits.

So you are building a schema from PeopleDbContext can you post that too?

When you compile person.where(name = ""{name}"") against PeopleDbContext it will look for a property/field called person.

Also person.where(name = ""{name}"") is not valid GraphQL, but you are using EntityQueryCompiler which allows this so that’s good, just wanted to spell that out though.

EntityQueryCompiler by itself is, well, less tested.

You should be able to take the compiledQueryResult.LambdaExpression which should be an expression like (Person p) => p.Where(t => t.Name == "...")

Note that perhaps you mean people.where()? But that depends on how you defined the schema or the PeopleDbContext class.

If you can provide a sample project I’d happily have a quick look.

[lukemurray]

sure thing.