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<ol class="chapter"><li class="chapter-item expanded "><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="../quickstart.html"><strong aria-hidden="true">2.</strong> Quickstart</a></li><li class="chapter-item expanded "><a href="../types/index.html"><strong aria-hidden="true">3.</strong> Type system</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../types/objects/index.html"><strong aria-hidden="true">3.1.</strong> Objects</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../types/objects/complex_fields.html"><strong aria-hidden="true">3.1.1.</strong> Complex fields</a></li><li class="chapter-item expanded "><a href="../types/objects/context.html"><strong aria-hidden="true">3.1.2.</strong> Context</a></li><li class="chapter-item expanded "><a href="../types/objects/error/index.html"><strong aria-hidden="true">3.1.3.</strong> Error handling</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../types/objects/error/field.html"><strong aria-hidden="true">3.1.3.1.</strong> Field errors</a></li><li class="chapter-item expanded "><a href="../types/objects/error/schema.html"><strong aria-hidden="true">3.1.3.2.</strong> Schema errors</a></li></ol></li><li class="chapter-item expanded "><a href="../types/objects/generics.html"><strong aria-hidden="true">3.1.4.</strong> Generics</a></li></ol></li><li class="chapter-item expanded "><a href="../types/interfaces.html"><strong aria-hidden="true">3.2.</strong> Interfaces</a></li><li class="chapter-item expanded "><a href="../types/unions.html"><strong aria-hidden="true">3.3.</strong> Unions</a></li><li class="chapter-item expanded "><a href="../types/enums.html"><strong aria-hidden="true">3.4.</strong> Enums</a></li><li class="chapter-item expanded "><a href="../types/input_objects.html" class="active"><strong aria-hidden="true">3.5.</strong> Input objects</a></li><li class="chapter-item expanded "><a href="../types/scalars.html"><strong aria-hidden="true">3.6.</strong> Scalars</a></li></ol></li><li class="chapter-item expanded "><a href="../schema/index.html"><strong aria-hidden="true">4.</strong> Schema</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../schema/subscriptions.html"><strong aria-hidden="true">4.1.</strong> Subscriptions</a></li><li class="chapter-item expanded "><a href="../schema/introspection.html"><strong aria-hidden="true">4.2.</strong> Introspection</a></li></ol></li><li class="chapter-item expanded "><a href="../serve/index.html"><strong aria-hidden="true">5.</strong> Serving</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../serve/batching.html"><strong aria-hidden="true">5.1.</strong> Batching</a></li></ol></li><li class="chapter-item expanded "><a href="../advanced/index.html"><strong aria-hidden="true">6.</strong> Advanced Topics</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../advanced/implicit_and_explicit_null.html"><strong aria-hidden="true">6.1.</strong> Implicit and explicit null</a></li><li class="chapter-item expanded "><a href="../advanced/n_plus_1.html"><strong aria-hidden="true">6.2.</strong> N+1 problem</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../advanced/dataloader.html"><strong aria-hidden="true">6.2.1.</strong> DataLoader</a></li><li class="chapter-item expanded "><a href="../advanced/lookahead.html"><strong aria-hidden="true">6.2.2.</strong> Look-ahead</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../advanced/eager_loading.html"><strong aria-hidden="true">6.2.2.1.</strong> Eager loading</a></li></ol></li></ol></li></ol></li></ol>
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<main>
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<h1 id="input-objects"><a class="header" href="#input-objects">Input objects</a></h1>
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<blockquote>
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<p><a href="https://spec.graphql.org/October2021#sec-Language.Fields">Fields</a> may accept <a href="https://spec.graphql.org/October2021#sec-Language.Arguments">arguments</a> to configure their behavior. These inputs are often <a href="https://spec.graphql.org/October2021#sec-Scalars">scalars</a> or <a href="https://spec.graphql.org/October2021#sec-Enums">enums</a>, but they sometimes need to represent more complex values.</p>
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<p>A <a href="https://spec.graphql.org/October2021#sec-Input-Objects">GraphQL input object</a> defines a set of input fields; the input fields are either <a href="https://spec.graphql.org/October2021#sec-Scalars">scalars</a>, <a href="https://spec.graphql.org/October2021#sec-Enums">enums</a>, or other <a href="https://spec.graphql.org/October2021#sec-Input-Objects">input objects</a>. This allows <a href="https://spec.graphql.org/October2021#sec-Language.Arguments">arguments</a> to accept arbitrarily complex structs.</p>
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</blockquote>
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<p>In <a href="https://docs.rs/juniper">Juniper</a>, defining a <a href="https://spec.graphql.org/October2021#sec-Input-Objects">GraphQL input object</a> is quite straightforward and similar to how <a href="objects/index.html">trivial GraphQL objects are defined</a> - by using the <a href="https://docs.rs/juniper/latest/juniper/derive.GraphQLInputObject.html"><code>#[derive(GraphQLInputObject)]</code> attribute</a> on a <a href="https://doc.rust-lang.org/reference/items/structs.html">Rust struct</a>:</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused_variables)]
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</span><span class="boring">extern crate juniper;
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</span><span class="boring">use juniper::{graphql_object, GraphQLInputObject, GraphQLObject};
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</span><span class="boring">
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</span>#[derive(GraphQLInputObject)]
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struct Coordinate {
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latitude: f64,
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longitude: f64
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}
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struct Root;
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<span class="boring">#[derive(GraphQLObject)] struct User { name: String }
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</span>
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#[graphql_object]
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impl Root {
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fn users_at_location(coordinate: Coordinate, radius: f64) -> Vec<User> {
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// Send coordinate to database
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// ...
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<span class="boring"> unimplemented!()
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</span> }
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}
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<span class="boring">
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</span><span class="boring">fn main() {}</span></code></pre></pre>
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<h3 id="renaming"><a class="header" href="#renaming">Renaming</a></h3>
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<p>Just as with <a href="objects/index.html#renaming">defining GraphQL objects</a>, by default <a href="https://doc.rust-lang.org/reference/items/structs.html">struct</a> fields are converted from <a href="https://www.rust-lang.org">Rust</a>'s standard <code>snake_case</code> naming convention into <a href="https://graphql.org">GraphQL</a>'s <code>camelCase</code> convention:</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate juniper;
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</span><span class="boring">use juniper::GraphQLInputObject;
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</span><span class="boring">
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</span>#[derive(GraphQLInputObject)]
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struct Person {
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first_name: String, // exposed as `firstName` in GraphQL schema
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last_name: String, // exposed as `lastName` in GraphQL schema
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}
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<span class="boring">
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</span><span class="boring">fn main() {}</span></code></pre></pre>
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<p>We can override the name by using the <code>#[graphql(name = "...")]</code> attribute:</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate juniper;
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</span><span class="boring">use juniper::GraphQLInputObject;
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</span><span class="boring">
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</span>#[derive(GraphQLInputObject)]
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#[graphql(name = "WebPerson")] // now exposed as `WebPerson` in GraphQL schema
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struct Person {
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name: String,
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age: i32,
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#[graphql(name = "websiteURL")]
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website_url: Option<String>, // now exposed as `websiteURL` in GraphQL schema
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}
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<span class="boring">
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</span><span class="boring">fn main() {}</span></code></pre></pre>
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<p>Or provide a different renaming policy for all the <a href="https://doc.rust-lang.org/reference/items/structs.html">struct</a> fields:</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate juniper;
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</span><span class="boring">use juniper::GraphQLInputObject;
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</span><span class="boring">
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</span>#[derive(GraphQLInputObject)]
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#[graphql(rename_all = "none")] // disables any renaming
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struct Person {
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name: String,
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age: i32,
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website_url: Option<String>, // exposed as `website_url` in GraphQL schema
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}
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<span class="boring">
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</span><span class="boring">fn main() {}</span></code></pre></pre>
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<blockquote>
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<p><strong>TIP</strong>: Supported policies are: <code>SCREAMING_SNAKE_CASE</code>, <code>camelCase</code> and <code>none</code> (disables any renaming).</p>
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</blockquote>
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<h3 id="documentation"><a class="header" href="#documentation">Documentation</a></h3>
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<p>Similarly, <a href="https://spec.graphql.org/October2021#sec-Descriptions">GraphQL descriptions</a> may be provided by either using <a href="https://doc.rust-lang.org/reference/comments.html#doc-comments">Rust doc comments</a> or with the <code>#[graphql(description = "...")]</code> attribute:</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate juniper;
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</span><span class="boring">use juniper::GraphQLInputObject;
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</span><span class="boring">
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</span>/// This doc comment is visible only in Rust API docs.
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#[derive(GraphQLInputObject)]
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#[graphql(description = "This description is visible only in GraphQL schema.")]
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struct Person {
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/// This doc comment is visible only in Rust API docs.
|
||
|
|
#[graphql(desc = "This description is visible only in GraphQL schema.")]
|
||
|
|
// ^^^^ shortcut for a `description` argument
|
||
|
|
name: String,
|
||
|
|
|
||
|
|
/// This doc comment is visible in both Rust API docs and GraphQL schema
|
||
|
|
/// descriptions.
|
||
|
|
age: i32,
|
||
|
|
}
|
||
|
|
<span class="boring">
|
||
|
|
</span><span class="boring">fn main() {}</span></code></pre></pre>
|
||
|
|
<blockquote>
|
||
|
|
<p><strong>NOTE</strong>: As of <a href="https://spec.graphql.org/October2021">October 2021 GraphQL specification</a>, <a href="https://spec.graphql.org/October2021#sec-Input-Objects">GraphQL input object</a>'s fields <strong>cannot be</strong> <a href="https://spec.graphql.org/October2021#sec--deprecated">deprecated</a>.</p>
|
||
|
|
</blockquote>
|
||
|
|
<h3 id="ignoring"><a class="header" href="#ignoring">Ignoring</a></h3>
|
||
|
|
<p>By default, all <a href="https://doc.rust-lang.org/reference/items/structs.html">struct</a> fields are included into the generated <a href="https://spec.graphql.org/October2021#sec-Input-Objects">GraphQL input object</a> type. To prevent inclusion of a specific field annotate it with the <code>#[graphql(ignore)]</code> attribute:</p>
|
||
|
|
<blockquote>
|
||
|
|
<p><strong>WARNING</strong>: Ignored fields must either implement <code>Default</code> or be annotated with the <code>#[graphql(default = <expression>)]</code> argument.</p>
|
||
|
|
</blockquote>
|
||
|
|
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate juniper;
|
||
|
|
</span><span class="boring">use juniper::GraphQLInputObject;
|
||
|
|
</span><span class="boring">
|
||
|
|
</span>enum System {
|
||
|
|
Cartesian,
|
||
|
|
}
|
||
|
|
|
||
|
|
#[derive(GraphQLInputObject)]
|
||
|
|
struct Point2D {
|
||
|
|
x: f64,
|
||
|
|
y: f64,
|
||
|
|
#[graphql(ignore, default = System::Cartesian)]
|
||
|
|
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||
|
|
// This attribute is required, as we need to be able to construct
|
||
|
|
// a `Point2D` value from the `{ x: 0.0, y: 0.0 }` GraphQL input value,
|
||
|
|
// received from client-side.
|
||
|
|
system: System,
|
||
|
|
// `Default::default()` value is used, if no
|
||
|
|
// `#[graphql(default = <expression>)]` is specified.
|
||
|
|
#[graphql(skip)]
|
||
|
|
// ^^^^ alternative naming, up to your preference
|
||
|
|
shift: f64,
|
||
|
|
}
|
||
|
|
<span class="boring">
|
||
|
|
</span><span class="boring">fn main() {}</span></code></pre></pre>
|
||
|
|
<blockquote>
|
||
|
|
<p><strong>TIP</strong>: See more available features in the API docs of the <a href="https://docs.rs/juniper/latest/juniper/derive.GraphQLInputObject.html"><code>#[derive(GraphQLInputObject)]</code></a> attribute.</p>
|
||
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