crosholo.blogg.se - Rails postgres json query

#Rails postgres json query how to#
#Rails postgres json query install#

#Rails postgres json query how to#

In the next articles, I will show you how to define mutations, add authentication, pagination and many more, so stay tuned.Storing lots of different data in a single database column does not get much love in traditional relational database approaches, mostly because it can lead to breaking normalization – and someone learning the hard way that there was a reason for all that normalization in the first place. This is actually everything to be able to perform nested queries like:Īs you can see, starting a GraphQL project with Ruby On Rails is super easy, therefore, if this is a solution that will solve your problems you shouldn’t stick to REST API and give it a try. Two for collections books and authors, and two for finding book and author using ID. app/graphql/types/enums/genre.rb Defining queries As you can see, we are using an enum for the genre.

We have a convention that at the top we are adding complex types, followed by ID and at the end simple types like Integer, String etc. The only thing that we have to do is addĪnd run seeds with rake db:seed Generates types As I mentioned before, GraphQL is strongly typed which means that if we want to query for `Author` and `Book` we have to define types for them. They will generate migrations that we can run with rake db:migrate.

adds app/graphql/store_manager_schema.rb that will be you entry point for the whole applicationīin/rails generate model Author first_name:string last_name:string date_of_birth:date -no-test-frameworkīin/rails generate model Book title:string author:references publication_date:integer genre:string -no-test-framework.

Thanks to them you will be able to use /graphiql path to easily test your endpoint locally. In routes.rb you will probably notice those lines of codes

#Rails postgres json query install#

You will have to do bundle install one more time to use it. adds gem 'graphiql-rails', group: :development to your Gemfile which mounts the GraphiQL IDE that you can use during development.We will be using them for constructing mutations, queries, interfaces, and other types Worth noticing is the way we gather parameters for GraphqlTestSchema.execute method. creates our graphQL controller app/controllers/graphql_controller.rb which will be handling all queries in the execute method:.As you can see this endpoint will be available for us in /graphql path but remember that you have to use the POST method to access it. Gem 'graphql' and follow it with bundle installĪs you probably know, in GraphQL API we define one endpoint which you can use for retrieving or changing data. We are going to use the graphql-ruby gem so in your Gemfile you have to add Remember to set up database.yml and then create a database with Rails new graphql_test -database=postgresql

The only other thing that you need is a running PostgreSQL.Īs usual with new Rails applications, you have to start with installing a bundlerĪnd then install the latest rails with this command (which can take a while)įinally, we will generate a new rails project

I also assume that you have created a gemset for your application. Ideally, you installed it through asdf or rvm. I assume that you have the latest Ruby version available on your computer. In this article, I would like to show you how to setup a Ruby On Rails application with PostgreSQL and GraphQL. It does not suffer from over-fetching or under-fetching of data and in opposition to the REST API, GraphQL is strongly typed and it is not versioned. It is not a silver bullet but it can definitely help you solve some challenges like getting many resources in a single request. It is a powerful tool that you can use for building your API. GraphQL is an open source query language created by Facebook.