Fix typos and add GitHub Action job for /book

.codespellrc

@@ -0,0 +1,2 @@
+[codespell]
+ignore-words-list = crate

.github/workflows/ci.yml

@@ -24,6 +24,7 @@ jobs:
     if: ${{ github.event_name == 'pull_request' }}
     needs:
       - bench
+      - codespell
       - clippy
       - feature
       - msrv
@@ -54,6 +55,15 @@ jobs:
 
       - run: make cargo.lint
 
+  codespell:
+    name: codespell (Book)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: codespell-project/actions-codespell@v2
+        with:
+          path: book/
+
   rustfmt:
     runs-on: ubuntu-latest
     steps:
@@ -342,6 +352,7 @@ jobs:
     needs:
       - bench
       - clippy
+      - codespell
       - feature
       - msrv
       - package
@@ -391,7 +402,7 @@ jobs:
     name: deploy (Book)
     if: ${{ github.ref == 'refs/heads/master'
          || startsWith(github.ref, 'refs/tags/juniper@') }}
-    needs: ["test", "test-book"]
+    needs: ["codespell", "test", "test-book"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4

Makefile

@@ -18,6 +18,9 @@ eq = $(if $(or $(1),$(2)),$(and $(findstring $(1),$(2)),\
 book: book.build
 
 
+codespell: book.codespell
+
+
 fmt: cargo.fmt
 
 
@@ -137,6 +140,15 @@ book.build:
 	mdbook build book/ $(if $(call eq,$(out),),,-d $(out))
 
 
+# Spellcheck Book.
+#
+# Usage:
+#	make book.codespell [fix=(no|yes)]
+
+book.codespell:
+	codespell book/ $(if $(call eq,$(fix),yes),--write-changes,)
+
+
 # Serve Book on some port.
 #
 # Usage:
@@ -180,8 +192,8 @@ graphql-playground:
 # .PHONY section #
 ##################
 
-.PHONY: book fmt lint release test \
-        book.build book.serve \
+.PHONY: book codespell fmt lint release test \
+        book.build book.codespell book.serve \
         cargo.fmt cargo.lint cargo.release cargo.test \
         graphiql graphql-playground \
         test.book test.cargo

book/src/advanced/dataloaders.md

@@ -1,7 +1,7 @@
 # Avoiding the N+1 Problem With Dataloaders
 
 A common issue with graphql servers is how the resolvers query their datasource.
-This issue results in a large number of unneccessary database queries or http requests.
+This issue results in a large number of unnecessary database queries or http requests.
 Say you were wanting to list a bunch of cults people were in
 
 ```graphql

book/src/advanced/multiple_ops_per_request.md

@@ -1,6 +1,6 @@
 # Multiple operations per request
 
-The GraphQL standard generally assumes there will be one server request for each client operation you want to perform (such as a query or mutation). This is conceptually simple but has the potential to be inefficent.
+The GraphQL standard generally assumes there will be one server request for each client operation you want to perform (such as a query or mutation). This is conceptually simple but has the potential to be inefficient.
 
 Some client libraries such as [apollo-link-batch-http](https://www.apollographql.com/docs/link/links/batch-http.html) have added the ability to batch operations in a single HTTP request to save network round-trips and potentially increase performance. There are some [tradeoffs](https://blog.apollographql.com/batching-client-graphql-queries-a685f5bcd41b) that should be considered before batching requests.
 

book/src/types/interfaces.md

@@ -61,13 +61,13 @@ Also, enum name can be specified explicitly, if desired.
 # extern crate juniper;
 use juniper::{graphql_interface, GraphQLObject};
 
-#[graphql_interface(enum = CharaterInterface, for = Human)] 
+#[graphql_interface(enum = CharacterInterface, for = Human)] 
 trait Character {
     fn id(&self) -> &str;
 }
 
 #[derive(GraphQLObject)]
-#[graphql(impl = CharaterInterface)]
+#[graphql(impl = CharacterInterface)]
 struct Human {
     id: String,
     home_planet: String,
@@ -248,7 +248,7 @@ use juniper::{graphql_interface, GraphQLObject};
 pub struct ObjA {
     id: Vec<String>,
 //  ^^ the evaluated program panicked at 
-//     'Failed to implement interface `Character` on `ObjA`: Field `id`: implementor is expected to return a subtype of 
+//     'Failed to implement interface `Character` on `ObjA`: Field `id`: implementer is expected to return a subtype of 
 //      interface's return object: `[String!]!` is not a subtype of `String!`.'    
 }
 

book/src/types/objects/using_contexts.md

@@ -127,7 +127,7 @@ impl User {
         let DatabaseContext(context) = context;
         // If context is immutable use .read() on RwLock.
         let mut context = context.write().await;
-        // Preform a mutable operation.
+        // Perform a mutable operation.
         context.requested_count.entry(self.id).and_modify(|e| { *e += 1 }).or_insert(1).clone()
     }
 

book/src/types/other-index.md

@@ -1,6 +1,6 @@
 # Other Types
 
-The GraphQL type system provides several types in additon to objects.
+The GraphQL type system provides several types in addition to objects.
 
 Find out more about each type below: