Gatsby graphql filter

GraphQL Query Options Reference

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After going through GatsbyJS docs I found this:. Why am I limited to these keywords when more keywords such as elemMatch are mentioned in docs? Let's say you have a markdown blog with categories as an array of string, you can filter posts with "historical" in categories like this:. You can try this query out in any of the graphiq blocks in Gatsby.

This way, you can apply further filters on the fields of each comment :. Learn more. Asked 1 year, 2 months ago. Active 1 year, 2 months ago.

Viewed 2k times. That's what I need! How can I create this filter? Atte Juvonen Atte Juvonen 3, 3 3 gold badges 25 25 silver badges 61 61 bronze badges. Active Oldest Votes. Derek Nguyen Derek Nguyen 6, 1 1 gold badge 10 10 silver badges 37 37 bronze badges. The first query you gave works in the toy examples, but it doesn't work in the real case.

Hey AtteJuvonen! Thanks, it works! This is really surprising. I would have expected a filter for "[a,b] in [b]" to return false when all elements in [a,b] are not found in [b]but it does return true, like I want it to. Glad it helps! I also think it is a bit unintuitive.

Sign up or log in Sign up using Google. Sign up using Facebook.In this guide, you will learn how to use the graphql tag in your pages, as well as go a little deeper into how the graphql tag works. Gatsby uses the concept of a page query, which is a query for a specific page in a site. The first step in displaying the description will be ensuring you have one to begin with.

The first thing to do is import graphql from Gatsby. At the top of index. Below the HomePage component declaration, export a new constant called query. Note that you can only have one page query per file. To start, update the HomePage component to destructure data from props. The data prop contains the results of the GraphQL query, and matches the shape you would expect. With this in mind, the updated HomePage markup looks like:.

Behind the scenes Gatsby handles these tags in a particular way:. During the Gatsby build process, GraphQL queries are pulled out of the original source for parsing. The longer answer is a little more involved: Gatsby borrows a technique from Relay that converts your source code into an abstract syntax tree AST during the build step.

gatsby graphql filter

More information about how queries work is included in the Gatsby Internals section of the docs. Variables can be added to page queries but not static queries through the context object that is an argument of the createPage API. In addition to hardcoding an argument directly into the page query, you can pass in a variable. The query can be changed to include a variable like this:. When a page is created dynamically from this blog post template in gatsby-node.

Keys in the context object that match up with arguments in the page query in this case: "title"will be used as variables. For more information, check out the docs on creating pages programmatically. The short answer The longer answer How to add query variables to a page query. How to use the graphql tag in pages Gatsby uses the concept of a page query, which is a query for a specific page in a site.

Add description to siteMetadata The first step in displaying the description will be ensuring you have one to begin with. How does the graphql tag work? Behind the scenes Gatsby handles these tags in a particular way: The short answer During the Gatsby build process, GraphQL queries are pulled out of the original source for parsing.

The longer answer The longer answer is a little more involved: Gatsby borrows a technique from Relay that converts your source code into an abstract syntax tree AST during the build step. How to add query variables to a page query Variables can be added to page queries but not static queries through the context object that is an argument of the createPage API.

The query can be changed to include a variable like this: When a page is created dynamically from this blog post template in gatsby-node. Edit this page on GitHub Last updated: April 9, This page will walk you through a series of GraphQL queries, each designed to demonstrate a particular feature of GraphQL.

For more information, read about why Gatsby uses GraphQL. Start with the basics, pulling up the site title from your gatsby-config. Here the query is on the left and the results are on the right. Try editing the query to include the description from siteMetadata. Gatsby structures its content as collections of nodeswhich are connected to each other with edges.

In this query you ask for the total count of plugins in this Gatsby site, along with specific information about each one. The query will still work and the returned object will reflect the nodes structure. There are several ways to reduce the number of results from a query. Skip over a number of results. In this query skip is used to omit the first 3 results.

GraphQL Tutorial - Full Guide To Making Queries (2018)

In this query filter and the ne not equals operator is used to show only results that have a title. You can find a good video tutorial on this here. Gatsby relies on Sift to enable MongoDB-like query syntax for object filtering. It is also possible to filter on multiple fields - just separate the individual filters by a comma works as an AND :. In this query the fields categories and title are filtered to find the book that has Fantastic in its title and belongs to the magical creatures category.

You can also combine the mentioned operators. You can filter out the latter with the ne operator. In the playground below the list, there is an example query with a description of what the query does for each operator. If you want to understand more how these filters work, looking at the corresponding tests in the codebase could be very useful.

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The ordering of your results can be specified with sort. You can also sort on multiple fields but the sort keyword can only be used once. The second sort field gets evaluated when the first field here: date is identical. The results of the following query are sorted in ascending order of date and title field. Children's Anthology of Monsters and Break with Banshee both have the same date but in the first query only one sort field the latter comes after the first. The additional sorting on the title puts Break with Banshee in the right order.

By default, sort fields will be sorted in ascending order. For example, to sort by frontmatter. Note that if you only provide a single sort order value, this will affect the first sort field only, the rest will be sorted in default ascending order. Gatsby relies on Moment. This allows you to use any tokens in your string.A great advantage of Gatsby is a built-in data layer that combines all data sources you configure.

Headless WordPress: Why Gatsby Should Be Next on Your List of Things to Learn

Data is collected at build time and automatically assembled into a schema that defines how data can be queried throughout your site. GraphQL is available in Gatsby without a special install: a schema is automatically inferred and created when you run gatsby develop or gatsby build.

Gatsby uses source plugins to pull in data. To source data with an existing plugin you have to install all needed packages. Furthermore you have to add the plugin to the plugins array in the gatsby-config with any optional configurations. If you want to source data from the filesystem for use with GraphQL, such as Markdown files, images, and more, refer to the filesystem data sourcing docs and recipes.

For instructions on installing plugins from npm, take a look at the instructions in the docs on using a plugin.

gatsby graphql filter

You can also create custom plugins to fit your own use cases and pull in data however you want. Data can be queried inside pages, components, or the gatsby-node.

For information on page and non-page components as they relate to queries, check out the docs guide on building with components. You can have one page query per page.

It can take GraphQL arguments for variables in your queries.

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Also, refer to the guide on querying data in pages with page query. More importantly, Gatsby looks for an exported graphql string from the file. When included in a page component file, a page query returns a data object that is passed automatically to the component as a prop. You can only have one StaticQuery per page: in order to include the data you need from multiple sources, you can use one query with multiple root fields.

It cannot take variables as arguments. Also, refer to the guide on querying data in components with static query. The StaticQuery component returns data in a render prop:. Because of how queries currently work in Gatsby, only one instance of useStaticQuery is supported in each file. Also, refer to the guide on querying data in components with useStaticQuery. Queries are written in the same shape you want data returned in.

How you source data will determine the names of fields that you can query on, based on the nodes they add to the GraphQL schema. For understanding the parts of a query refer to the conceptual guide.

GraphQL queries can take arguments to alter how the data is returned. The logic for these arguments is handled internally by Gatsby.

Arguments can be passed into fields at any level of the query. The arguments you can pass to collections like arrays or long lists of data - ex. For examples, refer to the query recipes and GraphQL query options reference guide. Fragments allow you to reuse parts of GraphQL queries. They also allow you to split up complex queries into smaller, easier to understand components.

For more information, check out the docs guide on using fragments in Gatsby. Some fragments come included in Gatsby plugins, such as fragments for returning optimized image data in various formats with gatsby-image and gatsby-transformer-sharpor data fragments with gatsby-source-contentful. The GraphQL schema can be customized for more advanced use cases: read more about it in the schema customization API docs.

Getting started with GraphQL GraphQL is available in Gatsby without a special install: a schema is automatically inferred and created when you run gatsby develop or gatsby build.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I want to query the markdown files and then filter them down to the files contained within a sub-directory. My folder structure looks like this:. So far I can query all the markdown pages in the directory but I'm having trouble trying to filter down path.

There must be a way to do it with a graphQL query. Instead what I do is map all the results and then check if the slug string includes 'team' this tells me that its in the 'team' folder. And then it makes the component. This works fine. But I thought the whole point of graphQl is to query and filter to return the exact data I need.

Instead I'm back at writing my own filter code in javascript:.

gatsby graphql filter

Have a look at the gatsby graphql reference for filter and make sure you are using graphiql to explore what is available within your schema. Learn more. Asked 6 months ago.

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I'm using Gatsby and MarkdownRemark. My folder structure looks like this: - src - pages -index. Instead I'm back at writing my own filter code in javascript: if item. Active Oldest Votes. Thank you ksav, This is exactly what I was looking for. I knew there had to be a way to do it.

I'm going to read through that filter documentation that you linked. I was having trouble articulating my searches to find this. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.There are many options for loading data into React components. One of the most popular and powerful of these is a technology called GraphQL.

GraphQL was invented at Facebook to help product engineers pull needed data into React components. GraphQL is a q uery l anguage the QL part of its name. Using a special syntax, you describe the data you want in your component and then that data is given to you.

Gatsby uses GraphQL to enable page and StaticQuery components to declare what data they and their sub-components need. Then, Gatsby makes that data available in the browser when needed by your components. Data from any number of sources is made queryable in one unified layer, a key part of the Gatsby building process:.

Data returned by GraphQL comes back in the exact same shape that you asked for it, without having to travel across the network because it was already gathered at build time. Since all data is combined in the data layer, it's even possible to query multiple sources at the same time. For a more in-depth look, read why Gatsby uses GraphQL. The result of the query is automatically inserted into your React component on the data prop.

GraphQL and Gatsby let you ask for data and then immediately start using it. The following diagram shows a GraphQL query, with each word highlighted in a color corresponding to its name on the legend:. This is similar to how you would name a function or a variable, and like a function this can be omitted if you would rather the query be anonymous.

Creating a static blog with Gatsby

We hope you love it as much as we do and find it useful for all your projects. The official Gatsby tutorial also includes an introduction to using GraphQL specifically with Gatsby.

One of the great things about GraphQL is how flexible it is. People use GraphQL with many different programming languages and for web and native apps.

Most people run GraphQL on a server to respond live to requests for data from clients. Gatsby uses GraphQL at build-time and not for live sites.

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Gatsby uses plugins which can fetch data from different sources. That data is used to automatically infer a GraphQL schema. This makes it easy to pull data from anywhere and immediately start writing GraphQL queries against your data. GraphQL enables another unique feature of Gatsby — it lets you control data transformations with arguments to your queries.

Some examples follow.

GraphQL Concepts

One way of doing this is to load a date-formatting JavaScript library into the browser. See the full list of formatting options by viewing our GraphQL reference page.

Gatsby has transformer plugins which can transform data from one form to another. A common example is markdown. If you install gatsby-transformer-remarkthen in your queries, you can specify if you want the transformed HTML version instead of markdown:. Gatsby has rich support for processing images. The query automatically creates all the needed responsive thumbnails and returns src and srcSet fields to add to your image element. Combined with a special Gatsby image component, gatsby-imageyou have a very powerful set of primitives for building sites with images.

Notice that in the above example for querying imageswe used You can read more about them here. If you wish to define your own fragments for use in your application, you can use named exports to export them in any JavaScript file, and they will be automatically processed by Gatsby for use in your GraphQL queries. For example, if I put a fragment in a helper component, I can use that fragment in any other query:. For example, on your index page you might map over all of your posts to show them in a list.

If the index component becomes too large, you might want to refactor it into smaller components.In this lesson, learn how to use StaticQuery to load data directly in the components that use them, making your Gatsby sites easier to understand and maintain.

Access all courses and lessons, track your progress, gain confidence and expertise. Instructor: Let's start by taking a look at where the data comes from. Right now, the heading is being pulled in through this GraphQL query that goes to the site metadata. Site metadata is added in Gatsby config. We have site metadata, title, and that gives us My Fantastic Website which is displayed here. The way that that's being done is this GraphQL query goes in this site, site metadata, title, and then that gets passed as data into our header component as a prop, so data, site metadata, title.

That shows up in the header as a title prop which we then display. We want to convert this over to a staticquery, so that we're able to get the data in the component that uses it instead of having to pass it around via props.

To do that, we're going to start by importing both staticquery and GraphQL from Gatsby. Then, we're going to set up this staticquery, and the static query has two props. The first one is the query prop, and the second one is a render prop which is going to receive data as an argument, and then it returns a component which we're going to use the same component that we had before.

Then we have to close this. Now we're set up almost, so we can remove this title prop because we're not going to use it anymore. Then we have to go back to our index, and we're going to just take this GraphQL query as is. Let's pull that out. Don't need this anymore at all. No longer need GraphQL from Gatsby, and we don't need to pass this title prop down anymore. Let's go ahead and get rid of that. This gives us our index file, nice and clean. We're not pulling in data that we don't need, that we're not using.

We're only displaying this header component and header component is responsible for its own data. To do that, let's put this query in place, get this ready, and now the results of this GraphQL query is going to be passed down as data. We need to make sure that that data is ending up giving us the title.

Data site, site metadata, title. Here we go. Let's save everything. We're going to need to restart our Gatsby server with yarn develop because we just changed the GraphQL query and that requires updating the cache. We're going to restart that, reload our page and there we go. Now we've got My Fantastic Website. Just to make sure that that is in fact what we need. Yep, that's shown up.

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Then let's go in and let's change the Gatsby config.


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