* Adds support for resolving union/interface types when using a generated schema
* Move resolveType __typename checking into defaultResolveType
* Clean up existing tests and improve error messages
ref: graphql/graphql-js#947
# Conflicts:
# src/Utils/BuildSchema.php
# tests/Utils/BuildSchemaTest.php
As discussed in facebook/graphql#90
This proposes replacing leading comment blocks as descriptions in the schema definition language with leading strings (typically block strings).
While I think there is some reduced ergonomics of using a string literal instead of a comment to write descriptions (unless perhaps you are accustomed to Python or Clojure), there are some compelling advantages:
* Descriptions are first-class in the AST of the schema definition language.
* Comments can remain "ignored" characters.
* No ambiguity between commented out regions and descriptions.
Specific to this reference implementation, since this is a breaking change and comment descriptions in the experimental SDL have fairly wide usage, I've left the comment description implementation intact and allow it to be enabled via an option. This should help with allowing upgrading with minimal impact on existing codebases and aid in automated transforms.
BREAKING CHANGE: This does not parse descriptions from comments by default anymore and the value of description in Nodes changed from string to StringValueNode
This RFC adds a new form of `StringValue`, the multi-line string, similar to that found in Python and Scala.
A multi-line string starts and ends with a triple-quote:
```
"""This is a triple-quoted string
and it can contain multiple lines"""
```
Multi-line strings are useful for typing literal bodies of text where new lines should be interpretted literally. In fact, the only escape sequence used is `\"""` and `\` is otherwise allowed unescaped. This is beneficial when writing documentation within strings which may reference the back-slash often:
```
"""
In a multi-line string \n and C:\\ are unescaped.
"""
```
The primary value of multi-line strings are to write long-form input directly in query text, in tools like GraphiQL, and as a prerequisite to another pending RFC to allow docstring style documentation in the Schema Definition Language.
Ref: graphql/graphql-js#926
This revert #202 (commit 9d37f4c) because trying to parse PSR-7 request
was a mistake. The whole point of PSR-7 is to allow for interoperability
and be able to use specialized libs for body parsing (amongst many other
things). Trying to parse ourselves would be opening a can of worm if/when
other content types have to be supported. It is more correct and future
safe to require that the body is parsed before being passed to GraphQL.
Because PSR-7 specification only specify that `getParsedBody()` **may**
return the parsed body for `application/json`, we cannot assume that it
is always the case. So if the value returned parsed body is an empty array,
it means we should try to parse it ourselves (`null` would mean no body at
all according to spec).
With this modification we try to used given parsed body, but fallback on
trying to parse the body if necessary. This leave the door open to custom
implementation of parsing if needed, while making it easier to use out of
the box.
