29<\/div>\n<\/td>\n
\n\n type Author {<\/code><\/div>\n\u00a0\u00a0<\/code>id: ID!<\/code><\/div>\n\u00a0\u00a0<\/code>name: String!<\/code><\/div>\n\u00a0\u00a0<\/code>posts: [Post]<\/code><\/div>\n\u00a0<\/code>}<\/code><\/div>\n<\/div>\n type Post {<\/code><\/div>\n\u00a0\u00a0<\/code>id: ID!<\/code><\/div>\n\u00a0\u00a0<\/code>title: String!<\/code><\/div>\n\u00a0\u00a0<\/code>body: String<\/code><\/div>\n\u00a0\u00a0<\/code>createdBy: Author!<\/code><\/div>\n\u00a0\u00a0<\/code>comments: [Comment]<\/code><\/div>\n}<\/code><\/div>\n<\/div>\n \u00a0<\/code>type Comment {<\/code><\/div>\n\u00a0\u00a0<\/code>id: ID!<\/code><\/div>\n\u00a0\u00a0<\/code>createdBy: Author!<\/code><\/div>\n\u00a0\u00a0<\/code>belongsTo: Post!<\/code><\/div>\n\u00a0\u00a0<\/code>text: String<\/code><\/div>\n\u00a0<\/code>}<\/code><\/div>\n<\/div>\n schema {<\/code><\/div>\n\u00a0\u00a0<\/code>query: Query<\/code><\/div>\n}<\/code><\/div>\n<\/div>\n type Query {<\/code><\/div>\n\u00a0\u00a0<\/code>allPosts: [Post]<\/code><\/div>\n\u00a0\u00a0<\/code>allAuthors: [Author]<\/code><\/div>\n}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\nWe start by defining the types, and types can be almost 1 to 1 with POJO\u2019s that we would create for our tables. First, we put a\u00a0name, then type. The character \u2018!<\/strong>\u2018 has special meaning, and it means that field is mandatory. If a field has this character and it isn\u2019t present in response it will be an invalid response and GraphQL will not send the response back, but will send appropriate error.<\/p>\nThe important thing to remember about schema is that all request and response will be validated with the schema. If a request doesn\u2019t pass schema validation, no work will be done by the server. Also if a response doesn\u2019t pass schema validation, it will not be sent to the client.<\/p>\n If you check type Author you will see that it has field posts which is of type Array of Post. Also, Post has field createdBy of type Author and comments which is of type Array of Comment. These fields are not present in POJO\u2019s<\/p>\n \n \n \n\n\n\n01<\/div>\n 02<\/div>\n 03<\/div>\n 04<\/div>\n 05<\/div>\n 06<\/div>\n 07<\/div>\n 08<\/div>\n 09<\/div>\n 10<\/div>\n 11<\/div>\n 12<\/div>\n 13<\/div>\n 14<\/div>\n 15<\/div>\n 16<\/div>\n 17<\/div>\n 18<\/div>\n 19<\/div>\n 20<\/div>\n 21<\/div>\n 22<\/div>\n 23<\/div>\n<\/td>\n \n\n Author.java<\/code><\/div>\n<\/div>\n | | | ![\"\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2017\/12\/Untitled.png\")
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