FieldType BuildQueryField <TSource, TReturn>(
string name,
Func <ResolveFieldContext <TSource>, IQueryable <TReturn> > resolve,
IEnumerable <QueryArgument> arguments,
Type graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
graphType = GraphTypeFinder.FindGraphType <TReturn>(graphType);
var listGraphType = MakeListGraphType(graphType);
return(new FieldType
{
Name = name,
Type = listGraphType,
Arguments = ArgumentAppender.GetQueryArguments(arguments),
Resolver = new AsyncFieldResolver <TSource, IEnumerable <TReturn> >(
async context =>
{
var returnTypes = resolve(context);
var withIncludes = includeAppender.AddIncludes(returnTypes, context);
var withArguments = withIncludes.ApplyGraphQlArguments(context);
var list = await withArguments.ToListAsync(context.CancellationToken);
return await filters.ApplyFilter(list, context.UserContext);
})
});
}
ConnectionBuilder <FakeGraph, TSource> BuildListConnectionField <TSource, TReturn>(
string name,
Func <ResolveFieldContext <TSource>, IEnumerable <TReturn> > resolve,
IEnumerable <string> includeName,
int pageSize,
Type graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
Guard.AgainstNegative(nameof(pageSize), pageSize);
graphType = GraphTypeFinder.FindGraphType <TReturn>(graphType);
var fieldType = GetFieldType <TSource>(name, graphType);
var builder = ConnectionBuilder <FakeGraph, TSource> .Create(name);
builder.PageSize(pageSize);
SetField(builder, fieldType);
IncludeAppender.SetIncludeMetadata(builder.FieldType, name, includeName);
builder.ResolveAsync(async context =>
{
var enumerable = resolve(context);
enumerable = enumerable.ApplyGraphQlArguments(context);
enumerable = await filters.ApplyFilter(enumerable, context.UserContext);
var page = enumerable.ToList();
return(ConnectionConverter.ApplyConnectionContext(
page,
context.First,
context.After,
context.Last,
context.Before));
});
return(builder);
}
public void AddNavigationConnectionField <TSource, TReturn>(
ComplexGraphType <TSource> graph,
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IEnumerable <TReturn> >?resolve = null,
Type?itemGraphType = null,
IEnumerable <QueryArgument>?arguments = null,
IEnumerable <string>?includeNames = null,
int pageSize = 10,
string?description = null)
where TReturn : class
{
Guard.AgainstNull(nameof(graph), graph);
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNegative(nameof(pageSize), pageSize);
itemGraphType ??= GraphTypeFinder.FindGraphType <TReturn>();
var fieldType = GetFieldType <TSource>(name, itemGraphType);
var builder = ConnectionBuilder <TSource> .Create <FakeGraph>(name);
SetField(builder, fieldType);
if (description != null)
{
builder.Description(description);
}
builder.PageSize(pageSize).Bidirectional();
IncludeAppender.SetIncludeMetadata(builder.FieldType, name, includeNames);
var hasId = keyNames.ContainsKey(typeof(TReturn));
if (resolve != null)
{
builder.ResolveAsync(async context =>
{
var efFieldContext = BuildContext(context);
var enumerable = resolve(efFieldContext);
enumerable = enumerable.ApplyGraphQlArguments(hasId, context);
enumerable = await efFieldContext.Filters.ApplyFilter(enumerable, context.UserContext);
var page = enumerable.ToList();
return(ConnectionConverter.ApplyConnectionContext(
page,
context.First,
context.After,
context.Last,
context.Before));
});
}
var connection = builder;
var field = graph.AddField(connection.FieldType);
field.AddWhereArgument(hasId, arguments);
}
FieldType BuildSingleField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, Task <IQueryable <TReturn> > > resolve,
IEnumerable <QueryArgument>?arguments,
Type?graphType,
bool nullable)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
//lookup the graph type if not explicitly specified
graphType ??= GraphTypeFinder.FindGraphType <TReturn>();
//if not nullable, construct a non-null graph type for the specified graph type
var wrappedType = nullable ? graphType : typeof(NonNullGraphType <>).MakeGenericType(graphType);
//build the field
return(new FieldType
{
Name = name,
Type = wrappedType,
//append the default query arguments to the specified argument list
Arguments = ArgumentAppender.GetQueryArguments(arguments),
//custom resolve function
Resolver = new AsyncFieldResolver <TSource, TReturn?>(
async context =>
{
var efFieldContext = BuildContext(context);
//get field names of the table's primary key(s)
var names = GetKeyNames <TReturn>();
//run the specified resolve function
var returnTypes = await resolve(efFieldContext);
//include sub tables in the query based on the metadata stored for the requested graph
var withIncludes = includeAppender.AddIncludes(returnTypes, context);
//apply any query filters specified in the arguments
var withArguments = withIncludes.ApplyGraphQlArguments(context, names);
//run the query
var single = await withArguments.SingleOrDefaultAsync(context.CancellationToken);
//apply global filters to the returned value
if (single != null)
{
if (await efFieldContext.Filters.ShouldInclude(context.UserContext, single))
{
return single;
}
}
//if no value was found, or if the returned value was filtered out by the global filters,
// either return null, or throw an error if the field is not nullable
if (nullable)
{
return null;
}
throw new ExecutionError("Not found");
})
});
}
static Type MakeListGraphType <TReturn>(Type?itemGraphType)
where TReturn : class
{
if (itemGraphType == null)
{
itemGraphType = GraphTypeFinder.FindGraphType <TReturn>();
}
return(nonNullType.MakeGenericType(listGraphType.MakeGenericType(itemGraphType)));
}
FieldType BuildNavigationField <TSource, TReturn>(
Type graphType,
string name,
Func <ResolveFieldContext <TSource>, IEnumerable <TReturn> > resolve,
IEnumerable <string> includeNames,
IEnumerable <QueryArgument> arguments)
where TReturn : class
{
graphType = GraphTypeFinder.FindGraphType <TReturn>(graphType);
var listGraphType = MakeListGraphType(graphType);
return(BuildNavigationField(name, resolve, includeNames, listGraphType, arguments));
}
ConnectionBuilder <TSource> BuildQueryConnectionField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IQueryable <TReturn> >?resolve,
int pageSize,
Type?itemGraphType,
string?description)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNegative(nameof(pageSize), pageSize);
itemGraphType ??= GraphTypeFinder.FindGraphType <TReturn>();
var fieldType = GetFieldType <TSource>(name, itemGraphType);
var builder = ConnectionBuilder <TSource> .Create <FakeGraph>(name);
SetField(builder, fieldType);
if (description != null)
{
builder.Description(description);
}
builder.PageSize(pageSize).Bidirectional();
if (resolve != null)
{
builder.Resolve(
context =>
{
var efFieldContext = BuildContext(context);
var query = resolve(efFieldContext);
if (disableTracking)
{
query = query.AsNoTracking();
}
query = includeAppender.AddIncludes(query, context);
var names = GetKeyNames <TReturn>();
query = query.ApplyGraphQlArguments(context, names, true);
return(query
.ApplyConnectionContext(
context.First,
context.After,
context.Last,
context.Before,
context,
context.CancellationToken,
efFieldContext.Filters));
});
}
return(builder);
}
ConnectionBuilder <FakeGraph, TSource> BuildQueryConnectionField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IQueryable <TReturn> > resolve,
int pageSize,
Type?graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
Guard.AgainstNegative(nameof(pageSize), pageSize);
//lookup the graph type if not explicitly specified
graphType ??= GraphTypeFinder.FindGraphType <TReturn>();
//create a ConnectionBuilder<graphType, TSource> type by invoking the static Create method on the generic type
var fieldType = GetFieldType <TSource>(name, graphType);
//create a ConnectionBuilder<FakeGraph, TSource> which will be returned from this method
var builder = ConnectionBuilder <FakeGraph, TSource> .Create(name);
//set the page size
builder.PageSize(pageSize);
//using reflection, override the private field type property of the ConnectionBuilder<FakeGraph, TSource> to be the ConnectionBuilder<graphType, TSource> object
SetField(builder, fieldType);
//set the resolve function (note: this is not async capable)
builder.Resolve(
context =>
{
//obtain the ef context
var efFieldContext = BuildContext(context);
//run the resolve function, then include the related tables on the returned query
var withIncludes = includeAppender.AddIncludes(resolve(efFieldContext), context);
//get field names of the table's primary key(s)
var names = GetKeyNames <TReturn>();
//apply any query filters specified in the arguments
var withArguments = withIncludes.ApplyGraphQlArguments(context, names);
//apply skip/take to query as appropriate, and return the query
return(withArguments
.ApplyConnectionContext(
context.First,
context.After,
context.Last,
context.Before,
context,
context.CancellationToken,
efFieldContext.Filters));
//note: does not apply global filters
});
//return the field to be added to the graph
return(builder);
}
ConnectionBuilder <FakeGraph, TSource> BuildListConnectionField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IEnumerable <TReturn> > resolve,
IEnumerable <string> includeName,
int pageSize,
Type graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
Guard.AgainstNegative(nameof(pageSize), pageSize);
//lookup the graph type if not explicitly specified
graphType = graphType ?? GraphTypeFinder.FindGraphType <TReturn>();
//create a ConnectionBuilder<graphType, TSource> type by invoking the static Create method on the generic type
var fieldType = GetFieldType <TSource>(name, graphType);
//create a ConnectionBuilder<FakeGraph, TSource> which will be returned from this method
var builder = ConnectionBuilder <FakeGraph, TSource> .Create(name);
//set the page size
builder.PageSize(pageSize);
//using reflection, override the private field type property of the ConnectionBuilder<FakeGraph, TSource> to be the ConnectionBuilder<graphType, TSource> object
SetField(builder, fieldType);
//add the metadata for the tables to be included in the query to the ConnectionBuilder<graphType, TSource> object
IncludeAppender.SetIncludeMetadata(builder.FieldType, name, includeName);
//set the custom resolver
builder.ResolveAsync(async context =>
{
var efFieldContext = BuildContext(context);
//run the specified resolve function
var enumerable = resolve(efFieldContext);
//apply any query filters specified in the arguments
enumerable = enumerable.ApplyGraphQlArguments(context);
//apply the global filter on each individually enumerated item
enumerable = await efFieldContext.Filters.ApplyFilter(enumerable, context.UserContext);
//pagination does NOT occur server-side at this point, as the query has already executed
var page = enumerable.ToList();
//return the proper page of data
return(ConnectionConverter.ApplyConnectionContext(
page,
context.First,
context.After,
context.Last,
context.Before));
});
//return the field to be added to the graph
return(builder);
}
public void AddQueryConnectionField <TSource, TReturn>(
IComplexGraphType graph,
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IQueryable <TReturn> >?resolve = null,
Type?itemGraphType = null,
IEnumerable <QueryArgument>?arguments = null,
int pageSize = 10,
string?description = null)
where TReturn : class
{
itemGraphType ??= GraphTypeFinder.FindGraphType <TReturn>();
var addConnectionT = addQueryableConnection.MakeGenericMethod(typeof(TSource), itemGraphType, typeof(TReturn));
addConnectionT.Invoke(this, new object?[] { graph, name, resolve, arguments, pageSize, description });
}
ConnectionBuilder <TSource> BuildListConnectionField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IEnumerable <TReturn> >?resolve,
IEnumerable <string>?includeName,
int pageSize,
Type?itemGraphType,
string?description)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNegative(nameof(pageSize), pageSize);
itemGraphType ??= GraphTypeFinder.FindGraphType <TReturn>();
var fieldType = GetFieldType <TSource>(name, itemGraphType);
var builder = ConnectionBuilder <TSource> .Create <FakeGraph>(name);
if (description != null)
{
builder.Description(description);
}
builder.PageSize(pageSize);
SetField(builder, fieldType);
IncludeAppender.SetIncludeMetadata(builder.FieldType, name, includeName);
if (resolve != null)
{
builder.ResolveAsync(async context =>
{
var efFieldContext = BuildContext(context);
var enumerable = resolve(efFieldContext);
enumerable = enumerable.ApplyGraphQlArguments(context);
enumerable = await efFieldContext.Filters.ApplyFilter(enumerable, context.UserContext);
var page = enumerable.ToList();
return(ConnectionConverter.ApplyConnectionContext(
page,
context.First,
context.After,
context.Last,
context.Before));
});
}
return(builder);
}
PaginationBuilder <TSource> BuildQueryPaginationField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IQueryable <TReturn> >?resolve,
int page,
int row,
Type?itemGraphType,
string?description)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNegative(nameof(page), page);
Guard.AgainstNegative(nameof(row), row);
itemGraphType ??= GraphTypeFinder.FindGraphType <TReturn>();
var fieldType = GetPaginationFieldType <TSource>(name, itemGraphType);
var builder = PaginationBuilder <TSource> .Create <FakeGraph>(name);
if (description != null)
{
builder.Description(description);
}
builder.Page(page).Row(row);
SetField(builder, fieldType);
if (resolve != null)
{
builder.Resolve(
context =>
{
var efFieldContext = BuildContext(context);
var query = resolve(efFieldContext);
query = includeAppender.AddIncludes(query, context);
var names = GetKeyNames <TReturn>();
query = query.ApplyGraphQlArguments(context, names);
return(query
.ApplyPaginationContext(
context.Page,
context.Row,
context,
context.CancellationToken,
efFieldContext.Filters));
});
}
return(builder);
}
FieldType BuildQueryFieldAsync <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, Task <IQueryable <TReturn> > > resolve,
IEnumerable <QueryArgument> arguments,
Type graphType)
where TReturn : class
{
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentNullException(nameof(name));
}
if (resolve == null)
{
throw new ArgumentNullException(nameof(resolve));
}
//lookup the graph type if not explicitly specified
graphType = graphType ?? GraphTypeFinder.FindGraphType <TReturn>();
//create a list graph type based on the base field graph type
var listGraphType = MakeListGraphType(graphType);
//build the field
return(new FieldType
{
Name = name,
Type = listGraphType,
//append the default query arguments to the specified argument list
Arguments = ArgumentAppender.GetQueryArguments(arguments),
//custom resolve function
Resolver = new AsyncFieldResolver <TSource, IEnumerable <TReturn> >(
async context =>
{
//get field names of the table's primary key(s)
var names = GetKeyNames <TReturn>();
//run the specified resolve function
var returnTypes = await resolve(BuildEfContextFromGraphQlContext(context));
//include subtables in the query based on the metadata stored for the requested graph
var withIncludes = includeAppender.AddIncludes(returnTypes, context);
//apply any query filters specified in the arguments
var withArguments = withIncludes.ApplyGraphQlArguments(context, names);
//query the database
var list = await withArguments.ToListAsync(context.CancellationToken);
//apply the global filter on each individually enumerated item
return filters == null ? list : await filters.ApplyFilter(list, context.UserContext);
})
});
}
FieldType BuildNavigationField <TSource, TReturn>(
Type graphType,
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IEnumerable <TReturn> > resolve,
IEnumerable <string> includeNames,
IEnumerable <QueryArgument> arguments)
where TReturn : class
{
//lookup the graph type if not explicitly specified
graphType = graphType ?? GraphTypeFinder.FindGraphType <TReturn>();
//graphType represents the base field type, not the list graph type
//create a list graph type based on the graph type specified
var listGraphType = MakeListGraphType(graphType);
//build the navigation field
return(BuildNavigationField(name, resolve, includeNames, listGraphType, arguments));
}
public FieldType AddNavigationField <TSource, TReturn>(
ComplexGraphType <TSource> graph,
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, TReturn?>?resolve = null,
Type?graphType = null,
IEnumerable <string>?includeNames = null,
string?description = null)
where TReturn : class
{
Guard.AgainstNull(nameof(graph), graph);
Guard.AgainstNullWhiteSpace(nameof(name), name);
graphType ??= GraphTypeFinder.FindGraphType <TReturn>();
FieldType field = new()
{
Name = name,
Type = graphType,
Description = description
};
IncludeAppender.SetIncludeMetadata(field, name, includeNames);
if (resolve != null)
{
field.Resolver = new AsyncFieldResolver <TSource, TReturn?>(
async context =>
{
var fieldContext = BuildContext(context);
var result = resolve(fieldContext);
if (await fieldContext.Filters.ShouldInclude(context.UserContext, result))
{
return(result);
}
return(null);
});
}
return(graph.AddField(field));
}
}
public void AddNavigationConnectionField <TSource, TReturn>(
ComplexGraphType <TSource> graph,
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IEnumerable <TReturn> >?resolve = null,
Type?itemGraphType = null,
IEnumerable <QueryArgument>?arguments = null,
IEnumerable <string>?includeNames = null,
int pageSize = 10,
string?description = null)
where TReturn : class
{
Guard.AgainstWhiteSpace(nameof(name), name);
Guard.AgainstNegative(nameof(pageSize), pageSize);
itemGraphType ??= GraphTypeFinder.FindGraphType <TReturn>();
var addConnectionT = addEnumerableConnection.MakeGenericMethod(typeof(TSource), itemGraphType, typeof(TReturn));
addConnectionT.Invoke(this, new object?[] { graph, name, resolve, pageSize, description, arguments, includeNames });
}
FieldType BuildQueryField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, Task <IQueryable <TReturn> > > resolve,
IEnumerable <QueryArgument>?arguments,
Type?graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
//lookup the graph type if not explicitly specified
graphType ??= GraphTypeFinder.FindGraphType <TReturn>();
//create a list graph type based on the base field graph type
var listGraphType = MakeListGraphType(graphType);
//build the field
return(new FieldType
{
Name = name,
Type = listGraphType,
//append the default query arguments to the specified argument list
Arguments = ArgumentAppender.GetQueryArguments(arguments),
//custom resolve function
Resolver = new AsyncFieldResolver <TSource, IEnumerable <TReturn> >(
async context =>
{
var efFieldContext = BuildContext(context);
//get field names of the table's primary key(s)
var names = GetKeyNames <TReturn>();
//run the specified resolve function
var query = await resolve(efFieldContext);
//include sub tables in the query based on the metadata stored for the requested graph
query = includeAppender.AddIncludes(query, context);
//apply any query filters specified in the arguments
query = query.ApplyGraphQlArguments(context, names);
//query the database
var list = await query.ToListAsync(context.CancellationToken);
//apply the global filter on each individually enumerated item
return await efFieldContext.Filters.ApplyFilter(list, context.UserContext);
})
});
}
FieldType BuildNavigationField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, TReturn> resolve,
IEnumerable <string> includeNames,
Type graphType)
where TReturn : class
{
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentNullException(nameof(name));
}
if (resolve == null)
{
throw new ArgumentNullException(nameof(resolve));
}
//lookup the graph type if not explicitly specified
graphType = graphType ?? GraphTypeFinder.FindGraphType <TReturn>();
//build field
return(new FieldType
{
Name = name,
Type = graphType,
//add the metadata for the tables to be included in the query
Metadata = IncludeAppender.GetIncludeMetadata(name, includeNames),
//custom resolve function simply applies the global filters; typically it's a pass-through
Resolver = new AsyncFieldResolver <TSource, TReturn>(async context =>
{
//run resolve function
var result = resolve(BuildEfContextFromGraphQlContext(context));
//apply global filters and return null if necessary
if (filters == null || await filters.ShouldInclude(context.UserContext, result))
{
return result;
}
return null;
})
});
}
FieldType BuildSingleField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, Task <IQueryable <TReturn> > > resolve,
IEnumerable <QueryArgument> arguments,
Type graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
graphType = GraphTypeFinder.FindGraphType <TReturn>(graphType);
var notNullGraph = typeof(NonNullGraphType <>);
var wrappedType = notNullGraph.MakeGenericType(graphType);
return(new FieldType
{
Name = name,
Type = wrappedType,
Arguments = ArgumentAppender.GetQueryArguments(arguments),
Resolver = new AsyncFieldResolver <TSource, TReturn>(
async context =>
{
var returnTypes = await resolve(BuildEfContextFromGraphQlContext(context));
var withIncludes = includeAppender.AddIncludes(returnTypes, context);
var names = GetKeyNames <TReturn>();
var withArguments = withIncludes.ApplyGraphQlArguments(context, names);
var single = await withArguments.SingleOrDefaultAsync(context.CancellationToken);
if (single != null)
{
if (await filters.ShouldInclude(context.UserContext, single))
{
return single;
}
}
throw new ExecutionError("Not found");
})
});
}
FieldType BuildNavigationField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, TReturn?>?resolve,
IEnumerable <string>?includeNames,
Type?graphType,
string?description)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
graphType ??= GraphTypeFinder.FindGraphType <TReturn>();
var fieldType = new FieldType
{
Name = name,
Type = graphType,
Metadata = IncludeAppender.GetIncludeMetadata(name, includeNames),
Description = description
};
if (resolve != null)
{
fieldType.Resolver = new AsyncFieldResolver <TSource, TReturn?>(
async context =>
{
var efFieldContext = BuildContext(context);
var result = resolve(efFieldContext);
if (await efFieldContext.Filters.ShouldInclude(context.UserContext, result))
{
return(result);
}
return(null);
});
}
return(fieldType);
}
ConnectionBuilder <FakeGraph, TSource> BuildQueryConnectionField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IQueryable <TReturn> > resolve,
int pageSize,
Type graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
Guard.AgainstNegative(nameof(pageSize), pageSize);
graphType = GraphTypeFinder.FindGraphType <TReturn>(graphType);
var fieldType = GetFieldType <TSource>(name, graphType);
var builder = ConnectionBuilder <FakeGraph, TSource> .Create(name);
builder.PageSize(pageSize);
SetField(builder, fieldType);
builder.Resolve(
context =>
{
var efFieldContext = BuildEfContextFromGraphQlContext(context);
var withIncludes = includeAppender.AddIncludes(resolve(efFieldContext), context);
var names = GetKeyNames <TReturn>();
var withArguments = withIncludes.ApplyGraphQlArguments(context, names);
return(withArguments
.ApplyConnectionContext(
context.First,
context.After,
context.Last,
context.Before,
context,
context.CancellationToken,
filters));
});
return(builder);
}
FieldType BuildNavigationField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, TReturn?> resolve,
IEnumerable <string>?includeNames,
Type?graphType)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
//lookup the graph type if not explicitly specified
graphType ??= GraphTypeFinder.FindGraphType <TReturn>();
//build field
return(new FieldType
{
Name = name,
Type = graphType,
//add the metadata for the tables to be included in the query
Metadata = IncludeAppender.GetIncludeMetadata(name, includeNames),
//custom resolve function simply applies the global filters; typically it's a pass-through
Resolver = new AsyncFieldResolver <TSource, TReturn?>(
async context =>
{
var efFieldContext = BuildContext(context);
//run resolve function
var result = resolve(efFieldContext);
//apply global filters and return null if necessary
if (await efFieldContext.Filters.ShouldInclude(context.UserContext, result))
{
return result;
}
return null;
})
});
}
FieldType BuildSingleField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IQueryable <TReturn> > resolve,
Func <ResolveEfFieldContext <TDbContext, TSource>, TReturn, Task>?mutate,
IEnumerable <QueryArgument>?arguments,
Type?graphType,
bool nullable,
string?description)
where TReturn : class
{
Guard.AgainstNullWhiteSpace(nameof(name), name);
Guard.AgainstNull(nameof(resolve), resolve);
graphType ??= GraphTypeFinder.FindGraphType <TReturn>();
Type?wrappedType;
if (nullable)
{
wrappedType = graphType;
}
else
{
wrappedType = typeof(NonNullGraphType <>).MakeGenericType(graphType);
}
return(new FieldType
{
Name = name,
Type = wrappedType,
Description = description,
Arguments = ArgumentAppender.GetQueryArguments(arguments),
Resolver = new AsyncFieldResolver <TSource, TReturn?>(
async context =>
{
var efFieldContext = BuildContext(context);
var names = GetKeyNames <TReturn>();
var query = resolve(efFieldContext);
if (disableTracking)
{
query = query.AsNoTracking();
}
query = includeAppender.AddIncludes(query, context);
query = query.ApplyGraphQlArguments(context, names);
var single = await query.SingleOrDefaultAsync(context.CancellationToken);
if (single != null)
{
if (await efFieldContext.Filters.ShouldInclude(context.UserContext, single))
{
if (mutate != null)
{
await mutate.Invoke(efFieldContext, single);
}
return single;
}
}
if (nullable)
{
return null;
}
throw new("Not found");
})
});
FieldType BuildSingleField <TSource, TReturn>(
string name,
Func <ResolveEfFieldContext <TDbContext, TSource>, IQueryable <TReturn> > resolve,
Func <ResolveEfFieldContext <TDbContext, TSource>, TReturn, Task>?mutate,
IEnumerable <QueryArgument>?arguments,
Type?graphType,
bool nullable,
string?description)
where TReturn : class
{
Guard.AgainstWhiteSpace(nameof(name), name);
graphType ??= GraphTypeFinder.FindGraphType <TReturn>(nullable);
var hasId = keyNames.ContainsKey(typeof(TReturn));
return(new()
{
Name = name,
Type = graphType,
Description = description,
Arguments = ArgumentAppender.GetQueryArguments(arguments, hasId, false),
Resolver = new AsyncFieldResolver <TSource, TReturn?>(
async context =>
{
var efFieldContext = BuildContext(context);
var names = GetKeyNames <TReturn>();
var query = resolve(efFieldContext);
if (disableTracking)
{
query = query.AsNoTracking();
}
query = includeAppender.AddIncludes(query, context);
query = query.ApplyGraphQlArguments(context, names, false);
QueryLogger.Write(query);
var single = await query.SingleOrDefaultAsync(context.CancellationToken);
if (single is not null)
{
if (await efFieldContext.Filters.ShouldInclude(context.UserContext, single))
{
if (mutate is not null)
{
await mutate.Invoke(efFieldContext, single);
}
return single;
}
}
if (nullable)
{
return null;
}
throw new ExecutionError("Not found");
})
});
}
