React Apollo dynamically create query from state

Question

Heres a model situation I have some fields in my DB lets say color,size,height ...

I can fetch and display these fields to user who can choose these fields and they are afterwards set to components state

What i want to achieve is to dynamically create GQL query (not query variables) from these fields stored in state

Example

//import react gql ....
class MyComponent extends Component {

constructor(props){
   super(props)
   this.state = {
     fields : []
   }
}

render(){
...
}

componentWillMount(){
    fetch(...)
      .then(fields => this.setState({fields}))
   }

}

export default graphql( --->state => CREATE_QUERY_DYNAMICALLY_FROM_FIELDS(state.fields)<----,{..some options})

Is there a way to access components state during query creation ?

Or some other approach ?

Any ideas appreciated

I don't think there is any built-in function for dynamically creating queries, but since the query is just a string you could format that string by yourself. Eg: `\`query{ topLevelField { ${ fields.join(',') } }}\`` Also you should declare the list of fields outside of your react component, if you are going to declare the `graphql` query outside of your component. — zoran404, Jun 15 '18 at 09:46
Since ```graphql``` doesn't support dynamic queries, try to use the apollo client and inject the query conditionally or even the declarative [](https://www.apollographql.com/docs/react/why-apollo.html#declarative-data) Component. — Lafi, Jun 15 '18 at 09:50
@LefiTarik great comment i have upgraded to react-apollo 2.1 and with works like a charm if you write it as an answer i would definitely accept :) — Ziker, Jun 20 '18 at 13:50

score 5 · Answer 1 · answered Jun 20 '18 at 16:11

class MyComponent extends Component {

   constructor(props){
       super(props)
       this.state = {
         fields : []
       }
   }

   render(){
   ...
   }

   componentWillMount(){
       const query = gql`
           query myDynamicQuery {
               viewer {
                   endpoint {
                       ${this.state.fields.join('\n')}
                   }
               }
           }
       `
       this.props.client.query({ query }).then((res) => ...)
   }
}
export default withApollo(MyComponent)

Hope this is working :)

Your suggestion works! In fact, the entire query can be dynamic. I do not know what downstream impact there might be (related to offline or subscriptions). — mabulu, Nov 09 '18 at 16:08

score 2 · Accepted Answer · answered Jun 20 '18 at 13:57

2

Since graphql doesn't support dynamic queries, try to use the apollo client and inject the query conditionally or even you could use the declarative <Query .../> Component.

answered Jun 20 '18 at 13:57

Lafi

1,310
1
15
14

2

actually graphql **does** support dynamic queries (the query is simply sent as a json payload in the post). I am going to try what @a-moynet suggested working – mabulu Nov 09 '18 at 14:34

React Apollo dynamically create query from state

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