Problems connecting api to react-native

i was doing a new app with react native i'm using rails/graphql but the problem is when i try to call the api url in my app with the configuration that i've made. it doesnt work at all (lauching expo cli), the error that o get is:

[Error: Network error: Network request failed]

i've already set the ip address of my pc instead of 'localhost' but i dont get any results my code is:

// React
import React from 'react';

// React-native
import { StyleSheet, Text, View } from 'react-native';

// Components
import Test from './app/components/Test/index';

import { ApolloProvider } from 'react-apollo'
import { ApolloClient } from 'apollo-client'
import { createHttpLink } from 'apollo-link-http'
import { InMemoryCache } from 'apollo-cache-inmemory'
import { setContext } from 'apollo-link-context';

// 2
const httpLink = createHttpLink({
  uri: 'http://my-ip-address:3000/graphql'
})

// 3
const client = new ApolloClient({
  link: httpLink,
  cache: new InMemoryCache()
})

export default class App extends React.Component {
  render() {
    console.log('client ', client)
    return (
      <ApolloProvider client={client}>
        <Test />
      </ApolloProvider> 
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});

the component that is calling the query is:

// React
import React, { Fragment } from 'react';

// React-native
import { StyleSheet, Text, View } from 'react-native';

// React Apollo
import { graphql } from 'react-apollo';
import {flowRight as compose} from 'lodash';

 // Queries
 import queries from './queries';

 class Test extends React.Component {
   constructor() {
     super();
   }

   render() {
     console.log('props ', this.props);
     return(
       <View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}>
         <Text>
           Se conecto! 
         </Text>
       </View>
     );
   }
 }


 export default compose(
   graphql(queries.getSpots, { name: 'getSpots' }),
 )(Test);