GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Graphql provides an excellent standard for queries and mutations.
Is there any support for sorting and filtering multiple fields for Graphql queries.
We can pass sort fields as simple input variables. Yes I read the response as why it won't support. I'am not sure is there someway to integrate with sequelizejs operators with Graphql.
In other words, you can include any form of arguments to your queries to support the server the resolverso it can return the data the client needs and in the form it needs it. With no disrespect intended, I'd venture to say you haven't yet made the "mental model shift" that Byron mentioned in his post.
Once you've made it, all of this will make a lot more sense. Thanks for the detailed response. But passing the list of values as object input field values will be difficult for complex queries. And also we should parse the JSON in mongoose schema resolver etc.
What UI component are you trying to feed data to? Is it by chance a search component of some kind? That is part of the "mental model shift". We are applying complex search criteria on DataTable UI components. You mean for something like this? No matter what, the only available possibility offered to you by GraphQL to filter and order the data on the server is to insert the filtering and ordering information through query arguments.
GraphQL itself does not have specific syntax dedicated to describing "sort" or "filter" semantics since that would require the underlying representation make such things available, even at the cost of performance. A field which returns values that could be sorted or filtered accept arguments describing how the client would like them. Also remember that you should use Variables when your query will be changing per request, that will avoid converting JSON descriptions of your filters and sorts into any kind of query syntax.
Thanks Smolinari and Leebyron for your comments. So the details won't be available in parent collection directly. I will try to make it as single collection otherwise it is going to be complex. Thanks in advance.
In graphiql you'll see a "variables" editor in the bottom left.In GraphQL we would like to follow this pattern as well. In this article we will go through modifiers, a special group of types which allows us to modify the default behavior of other types.
In GraphQL we deal with various groups of types. These groups are as follows:. It may be helpful first to go through the articles above. After gaining a fundamental understanding of other types such as scalars and object types you can then move on to modifiers. Next we can start working on the project setup so that we can test our queries. We assume that yarngit and Node. Now you can execute this command in your shell. The model schema in the repository is built with a class-based approach using the graphql-js library.
It is often much clearer to view the whole schema written in Schema definition language SDL. For some time now, SDL has been a part of the specification and it is often used to build the schema itself using the buildschema utility or the library called graphql-tools.
We can see that we have defined one output object type called User with the following fields: idusernameemailphonefirstnamelastname. The id field is typed as an ID scalar and other fields are typed as Strings. The user query returns the User object based on the passed id. The users query then returns a list of users. We have also defined the nonrequired enum type role, which is used in the users query as an argument for filtering the result.
In this simple schema we used modifiers quite a lot. In the rest of the article we will go through these use cases. As we have already mentioned, modifier is a special group of types in GraphQL. These types can be defined as follows:. From this definition it is clear that we always need to define the type to which we are applying the modifier.
In current GraphQL specification, we have these two types of modifiers. Each of the modifier is classified as a separate type:. The list modifier will be our main focus in this article. It will allow us to define if we would like to return a sequence of types.
In this article we will focus mainly on List modifiers and leave a more in-depth discussion of non-null modifiers for another article. In general, a GraphQL list represents a sequence of values.
It is possible to view these values as arrays e. As we mentioned a list keeps items in order. In SDL the list modifier is written as square brackets with the wrapped instance of the type in the bracket. In our schema we used the list modifier to define that if we call the query users, it returns a sequence of types of User from the database.
This is achieved by defining the schema as follows:. By calling query users we expect to return a list of users. The queries in our repository are defined as follows:. We can see that we achieve the same functionality as with SDL.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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I've recently dove into GraphQL and am loving it so far. Being consistent with why GraphQL was made and what it is, it obviously does not supports as it is not a data store.
GraphQL Query Options Reference
However, I have been researching online and was wondering if there is a GraphQL-recommended way of implementing operators. If not, should there be? I've seen people take a few different approaches, and our team has thought of some of their own, and here are two of our most popular internally ideas.
I'd love to get feedback on them. In conclusion, the feeling I get is going to JSON is the right route to go, even though it might be unfortunate.
Example two seems to be the simplest, and even it is quite a bit of code. Maybe a mix of having support for simple filtering caseStatus:'something' caseStatus:'! I am also new to GraphQL and not sure at all if this might help, but I believe this is where directives might come in handy.
Arguments are usually more generic than setting the conditions for your query, so I'm not sure operators would make sense in arguments. There are different approaches as to how to model the sequlized queries, but just tackling your listed examples something like this would be possible I think.
Hey asiandrummer thanks for the response. With the following, the problem is that there would be two queries done to the database when I'd like just one done.
GraphQL List - How to use arrays in GraphQL schema (GraphQL Modifiers)
With the second example, that's exactly how I see graphql, but the issue here is that the caseCategories query is contextual; I'd have to define it so that the schema knows it is being queried for categories. Whereas I need all fields on the entity case searchable and don't know which ones will be searched against and with what operators.
In addition, there are fields that are arrays for example userListand if I assume that when an array is passed as a value it is an or query, then I'd never be able to do an exact value match for userList. I was playing around with the idea of having operators like or and and and that they'd be queryable like so. The or being a graphql schema that resolves a string.
If so, how was it tackled? I think to properly understand why it does not have these requires a shift in mental models. To help understand the mental model shift, it's useful to think about fields and arguments like function calls in programming languages.
In GraphQL, like in programming languages, the arguments provided to a field do not have semantic meaning.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.
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.
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. See moment. You can also pass in a locale to adapt the output to your language. The above query gives you the english output for the weekdays, this example outputs them in german.
Dates also accept the fromNow and difference function. The former returns a string generated with Moment. Excerpts accept three options: pruneLengthtruncateand format.
These can be both simple scalar values as well as objects. To add variables to page component queries, pass these in the context object when creating pages.Using the graphQL query interface is there a mechanism to filter on multiple values?
I was previously querying cayley with gizmo, and was able to filter on multiple values there, by passing an array of string values to the second parameter of the has function though this does not seem to be documented, it does work.
In gizmo I could do this by writing something like g. My workaround for graphQL would be to send multiple queries, but that may not be ideal if there were a large number of car models in this example. I did see a topic touching on this in a a discussion about collaboration between a common graphql like language between dgraph, and cayley, one of the customizations that that thread talked about was dgraph added custom support for filter filtering on multiple values.
Which lead me to wonder if there is anything in place in cayley graphql which would allow for filtering on multiple values? This was a bit of misinformation from my side - Cayley already supports filters on multiple values. Just tested version verison 0. For future reference, this actually does work, the problem was that you need a space between the colon, and the brace of the array, so it should be model: [.
With that change it works. GraphQL, possible to filter on multiple values? Getting Help. Multiple values are not supported yet, but it should be easy to implement.
Invocation: cayley http -i. Has g. It works, this is good enough for my purposes for the time being. Thank you.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I have a user field set up as shown in the Arguments section of the docs. So I can query my data source for a user by id. But what if I want them to be able to search by different fields as well?
Or get a list of all users? I'm told Expected value of type "abstractplay. UserType" but got: abstractplay. But there's no casting that happens in the working code. So what am I supposed to do differently with this new code that returns multiple results?
Here's a good tutorial that goes through a lot of things and uses EF. Many thanks. I'll walk through that. Thanks for your patience with my questions.
Again, if you're open, I'll submit a docs PR once I get things working. There's some foundational stuff that might be helpful. I think it would be helpful. I was just looking at the basic StarWars example and it doesn't show returning a list of data.
So it would be helpful for sure.
I implemneted slightly different sorting, filtering and grouping inspired by Linq actually! In Linq you have pipes described by expressions which defer execution till it reaches a materializing expression. This is described very well in Linq ecosystem. For example users. Also, there is System. Dynamic nuget package which basically implements a good part of Linq by using string expressions.
For my example I would then have users. In your example then instead of creating multiple properties to basically just do filtering I would have. The only downside is the variable shape of the output since where, orderBy and groupBy properties are going to appear in the output a variable number of ways depending on the query. My solution for that was to use in the query renaming of properties, which is a GraphQL feature and then use JsonPath to get to the actual results.
Thinking more about it, a better implementation would be to just use directives for where and orderBy since they do not actually modify the shape of the result. This would be my next implementation. Perlkonig I encourage you to view this example project by Jacek Kosciesza.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
Already on GitHub? Sign in to your account. Confirmed, this is implemented, issue with original query was it required a space between the colon and the array brace, ie model: [.How to Extract Data from a Spreadsheet using VLOOKUP, MATCH and INDEX
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Sign up. New issue. Jump to bottom. Labels good first issue query languages. Milestone v0. Copy link Quote reply. This comment has been minimized. Sign in to view. Member Author. It was actually implemented earlier. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.