react admin newrecords.foreach is not a function
The problem is due to your data sample format, in that case your API respose it is an object, but it need to be an array instead. Like this:
[
{ id: 126, title: "allo?", author_id: 12 },
{ id: 127, title: "bien le bonjour", author_id: 12 },
{ id: 124, title: "good day sunshine", author_id: 12 },
{ id: 123, title: "hello, world", author_id: 12 },
{ id: 125, title: "howdy partner", author_id: 12 }
]