Last Sync: 2022-11-19 17:30:05

Databases/GraphQL/Apollo/Apollo_Server.md

@@ -2,7 +2,7 @@
 title: Apollo Server
 categories:
   - Databases
-tags: [graphql]
+tags: [graphql, REST, APIs]
 ---
 
 # Apollo Server

Databases/GraphQL/Apollo/Using_arguments_with_Apollo_Client.md

@@ -219,4 +219,66 @@ query track(id: 'xyz'){
 }
 ```
 
-The '
+The `id` parameter would be used by the `modules` resolver to return the array of the `Modules` type.
+
+## Variables in arguments
+
+Instead of writing the following within our query constants on the client-side:
+
+```js
+query GetTrack {
+  track(id: 'xyz'){
+    title
+  }
+}
+```
+
+We can make the code more reusable by using variables instead of the hardcoded `id` argument:
+
+```js
+query GetTrack($trackId: ID!) {
+  track(id: $trackId){
+    title
+  }
+}
+```
+
+This way we do not need to write a new query constant every time we want to return a specific track.
+
+## Send query with arguments using Apollo `useQuery`
+
+We can now write a proper query using the [useQuery hook](/Databases/GraphQL/Apollo/Apollo_Client.md#usequery-hook) from Apollo Client, with variables.
+
+First define our query constant:
+
+```js
+export const GET_TRACK = gql`
+  query GetTrack($trackId: ID!) {
+    track(id: $trackId) {
+      id
+      title
+      author {
+        name
+      }
+      description
+      modules {
+        id
+        title
+        length
+      }
+    }
+  }
+`;
+```
+
+Then to employ in React:
+
+```jsx
+const trackId = "xyz";
+
+const { loading, error, data } = useQuery(GET_TRACK, {
+  variables: trackId,
+});
+```
+
+Note that in contrast to the [simple example](/Databases/GraphQL/Apollo/Apollo_Client.md#query-constants)

Databases/MongoDB/Adding_documents_to_a_collection.md

@@ -1,7 +1,7 @@
 ---
 categories:
   - Databases
-tags: [mongo_db, node-js, mongoose]
+tags: [mongo-db, node-js, mongoose]
 ---
 
 # Adding documents to a collection

Databases/MongoDB/Creating_a_schema_and_model.md

@@ -1,7 +1,7 @@
 ---
 categories:
   - Databases
-tags: [mongo_db, node-js, mongoose]
+tags: [mongo-db, node-js, mongoose]
 ---
 
 # Creating a schema and model

Databases/MongoDB/Validating_Mongoose_schemas.md

@@ -1,7 +1,7 @@
 ---
 categories:
   - Databases
-tags: [mongo_db, node-js, mongoose]
+tags: [mongodb, node-js, mongoose]
 ---
 
 # Validating Mongoose schemas

Theory_of_Computation/Defining_a_computer.md

@@ -2,7 +2,7 @@
 categories:
   - Computer Architecture
 tags:
-  - theory-of-omputation
+  - theory-of-computation
   - history
 ---
 

Trash/Creating_a_GraphQL_server.md

@@ -2,7 +2,7 @@
 title: Creating a GraphQL server
 categories:
   - Databases
-tags: [graph-ql]
+tags: [graphql]
 ---
 
 # Creating a GraphQL server