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--- learnexa_graphql_api [2019/04/19 07:35]
182.72.26.6 [Implementation]
+++ learnexa_graphql_api [2019/08/08 05:29] (current)
182.72.26.6 [Learnexa GrapphQL API]
@@ Line 1: / Line 1: @@
-====== Learnexa GrapphQL API ======
+====== Learnexa GraphQL API ======
 ===== Implementation =====
@@ Line 67: / Line 67: @@
 <code>
 class Content < ApplicationRecord
+  has_many :course_contents, :dependent => :destroy
+  has_many :courses, :through => :course_contents, :class_name => 'Course', :source => :course
 end
 </code>
@@ Line 93: / Line 95: @@
     field :created_at, String, null: false
     field :updated_at, String, null: false
+    field :course_contents, [Types::CourseContentType], null: false
   end
 end
@@ Line 125: / Line 128: @@
     def get_course(id:)
       Course.find(id)
+    end
+    def get_content(id:)
+      Content.find(id)
     end
   end
@@ Line 144: / Line 151: @@
 ) Start rails server
-Open localhost:3000/graphiql to gew
+Open localhost:3000/graphiql to run the queries and fetch records.
+) Sample API curl call:
+Example 1
+Request
+<code>
+curl \
+  -X POST \
+  -H "Content-Type: application/json" \
+  --data '{ "query": "{ allCourses { title } }" }' \
+  http://localhost:3000/graphql
+</code>
+Response
+<code>
+{"data":{"allCourses":[{"title":"ds"},
+  {"title":"Agile Query-Driven Data Modeling for NoSQL"},
+  {"title":"Practitioner’s Perspective on the Enterprise Data Model"},
+  {"title":"A Foundation For All Things Process: Modeling, Design and Architecture"},
+  {"title":"Human-Centered Design"},{"title":"Application Development with Python and Flask"}]}
+}
+</code>
+Example 2
+Request query:
+<code>
+{
+  getContent(id: 3234) {
+    title
+    courseContents {
+      maximumAttempts
+    }
+  }
+}
+</code>
+Response:
+<code>
+{
+  "data": {
+    "getContent": {
+      "title": "Intermediate System to Intermediate System (IS-IS) Routing Protocol",
+      "courseContents": [
+        {
+          "maximumAttempts": 1
+        }
+      ]
+    }
+  }
+}
+</code>
+Example 3
+Request:
+<code>
+{
+  getCourse(id: 2) {
+    title
+    contents {
+      title
+    }
+  }
+}
+</code>
+Response:
+<code>
+{
+  "data": {
+    "getCourse": {
+      "title": "Practitioner’s Perspective on the Enterprise Data Model",
+      "contents": [
+        {
+          "title": "Practitioner’s Perspective on the Enterprise Data Model"
+        }
+      ]
+    }
+  }
+}
+</code>
+===== API Setup Server =====
+) Download the following zip file
+{{learnexa_api.zip}}
+) Run "bundle install"
+) Change database name in "database.yml". Point it to current devlep01 server database.
+) Start rails server in the working directory "rails s"

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