How to add variables to graphQL query? - graphql

Question

I am using Gatsby.
I need to increase the limit of 3 to each onCLick.
I've tried to follow this post, but with no success, so I removed the edits, and here is the original code...
This will help me to load more posts.
export const LatestNews = ({data}) => {
console.log(data);
return (
<section id="news_posts_section">
<p>some data</p>
</section>
);
};
export const latestNewsQuery = graphql`
query myquery{
allMarkdownRemark(
filter: { frontmatter: { layout: { eq: "news" } } }
sort: { fields: frontmatter___date, order: DESC }
limit: 2
) {
nodes {
frontmatter {
layout
title
path
date
featuredImage
thumbnail
}
excerpt(pruneLength: 325)
}
}
}
`;
Here is my gatsby-node:
exports.createPages = ({ actions, graphql }) => {
const { createPage } = actions;
const blogPostTemplate = path.resolve('src/templates/blog-post/BlogPost.js');
const newsTemplate = path.resolve('src/templates/news-single/NewsSingle.js');
const latestNewsPage = path.resolve(
'src/components/pages-implementation/news/sections/LatestNews.js',
);
const blog = graphql(`
{
blog: allMarkdownRemark(
filter: { frontmatter: { layout: { eq: "blog" } } }
) {
edges {
node {
frontmatter {
path
}
}
}
}
}
`).then((result) => {
if (result.errors) {
result.errors.forEach((e) => console.error(e.toString()));
return Promise.reject(result.errors);
}
const posts = result.data.blog.edges;
posts.forEach((edge) => {
const { path } = edge.node.frontmatter;
createPage({
path: path,
component: blogPostTemplate,
context: {},
});
});
});
const news = graphql(`
{
news: allMarkdownRemark(
filter: { frontmatter: { layout: { eq: "news" } } }
) {
edges {
node {
frontmatter {
path
}
}
}
}
}
`).then((result) => {
if (result.errors) {
result.errors.forEach((e) => console.error(e.toString()));
return Promise.reject(result.errors);
}
const news = result.data.news.edges;
news.forEach((edge) => {
const { path } = edge.node.frontmatter;
createPage({
path: path,
component: newsTemplate,
context: {},
});
});
news.forEach(edge => {
createPage({
path: `/news/`,
component: latestNewsPage,
context: {
// This time the entire product is passed down as context
product: edge
}
});
});
});
return Promise.all([blog, news]);
};
Edit 21 November:
I replaced the above code with my attempt to use a non-static query
I added the gatsby-node config
I give here a little explanation: the BlogPost.js and NewsSingle.js are templates that create new pages for each post or news post (from Netlify CMS)
The LatestNews.js is a component in a page. This is the main page of the news. Where are shown all the news? With a static query, it works fine, however, I need to make the "limit" a variable in order to apply a load more button, that onClick will increase the limit, thus showing more news posts on the loop.
With the above configuration it says:
warning The GraphQL query in the non-page component "/home/user/projectname/src/components/pages-implementation/news/sections/LatestNews.js" will not be run.
Exported queries are only executed for Page components. It's possible you're
trying to create pages in your gatsby-node.js and that's failing for some
reason.

Answer 1

useStaticQuery (hence the name) does not allow to receive variables. If you take a look at the docs:
useStaticQuery does not accept variables (hence the name “static”),
but can be used in any component, including pages
The only way to pass variables in a GraphQL query is by using the context API in the gatsby-node.js. For example:
queryResults.data.allProducts.nodes.forEach(node => {
createPage({
path: `/products/${node.id}`,
component: productTemplate,
context: {
// This time the entire product is passed down as context
product: node
}
});
});
};
In the snippet above, will be a product variable in the context with the whole node. It can be accessed through pageContext prop in the destination template or used as a query parameter.