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Clarify execution section. #221

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merged 5 commits into from Oct 24, 2016
Merged

Clarify execution section. #221

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d193f58
Clarify execution section.
leebyron Oct 21, 2016
237a9cf
Follow up improvements thanks to @jjergus feedback
leebyron Oct 22, 2016
7352f04
Another pass at further improvements to describing these operations. …
leebyron Oct 22, 2016
6147aef
Note about the purpose of initial value
leebyron Oct 22, 2016
a82434f
Add default value rules, further error throwing spots
leebyron Oct 24, 2016
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24 changes: 23 additions & 1 deletion spec/Section 3 -- Type System.md
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Expand Up @@ -786,7 +786,8 @@ not provided, or for which the value {null} was provided, an error should
be thrown.
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With the introduction of a null literal, do we need a separate concept of "non-nullable" and "required"? For example, should it be possible to declare an input object field which must be provided, but its value may be null?

{ required_field: 42 } # valid
{ required_field: null } # valid
{ } # invalid
{ required_field: $var } # valid if $var is required but $var may be nullable...I guess?

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I'll make sure to specifically address this point in the null literal proposal.

I think it's actually not worth separating these notions. I think there probably isn't a ton of value beyond fairly pedantic specificity in the cases of required but nullable and optional but non-nullable.


The result of coercion is an environment-specific unordered map defining slots
for each field of the input object type.
for each field both defined by the input object type and provided by the
original value.

For each field of the input object type, if the original value has an entry with
the same name, and the value at that entry is a literal value or a variable
Expand All @@ -797,6 +798,27 @@ The value of that entry in the result is the outcome of input coercing the
original entry value according to the input coercion rules of the
type declared by the input field.

Following are examples of Input Object coercion for the type:

```graphql
input ExampleInputObject {
a: String
b: Int!
}
```

Original Value | Variables | Coerced Value
-------------------------------------------------------------------------------
`{ a: "abc", b: 123 }` | `{}` | `{ a: "abc", b: 123 }`
`{ a: 123, b: "123" }` | `{}` | `{ a: "123", b: 123 }`
`{ a: "abc" }` | `{}` | Error: Missing required field {b}
`{ b: $var }` | `{ var: 123 }` | `{ b: 123 }`
`{ b: $var }` | `{ var: null }` | Error: {b} must be non-null.
`{ b: $var }` | `{}` | Error: {b} must be non-null.
`{ b: $var }` | `{}` | Error: {b} must be non-null.
`{ a: $var, b: 1 }` | `{ var: null }` | `{ a: null, b: 1 }`
`{ a: $var, b: 1 }` | `{}` | `{ b: 1 }`

#### Input Object type validation

1. An Input Object type must define one or more fields.
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