Uncaught ReferenceError: ReactDOM is not defined about graphiql-rails HOT 7 CLOSED

I had this issue and it turned it to be caused because I was trying to use the graphiql gem on an API only rails project.

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i had a same issue! what is the solution?

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Which middlewares to add ?

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I had a play with the graphiql-rails gem. I tried bumping the graphiql version and re ordering the assets with no luck. Then I added a 500ms delay so the assets are all loaded. It's not elegant but it's a temporary fix.

gem 'graphiql-rails', git: 'https://github.com/gregology/graphiql-rails'

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Also I just noticed the error trace has turbolinks in it. Does this happen on a direct visit to /graphiql, or only after clicking a link? If it's only from clicking a link, you can see if you can disable turbolinks for that link.

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Yes @rmosolgo, that fixed it. I disabled turbolinks in my rails 5.2 app with:

<%= link_to "GraphiQL", '/graphiql', data: { turbolinks: false } %>

Thanks team!

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@Spots did you manage to get this working using an API only project?

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