[explore-v2] add edit link below datasource select (#1919)

* add edit link below datasource select

* add default prop

superset/assets/javascripts/explorev2/components/SelectField.jsx

@@ -1,11 +1,11 @@
 import React, { PropTypes } from 'react';
 import Select, { Creatable } from 'react-select';
 
-
 const propTypes = {
   choices: PropTypes.array,
   clearable: PropTypes.bool,
   description: PropTypes.string,
+  editUrl: PropTypes.string,
   freeForm: PropTypes.bool,
   label: PropTypes.string,
   multi: PropTypes.bool,
@@ -18,6 +18,7 @@ const defaultProps = {
   choices: [],
   clearable: true,
   description: null,
+  editUrl: null,
   freeForm: false,
   label: null,
   multi: false,
@@ -89,6 +90,9 @@ export default class SelectField extends React.Component {
     return (
       <div>
         {selectWrap}
+        {this.props.editUrl &&
+          <a href={`${this.props.editUrl}/${this.props.value}`}>edit</a>
+        }
       </div>
     );
   }

superset/assets/javascripts/explorev2/stores/fields.js

@@ -31,6 +31,7 @@ export const fields = {
     label: 'Datasource',
     clearable: false,
     default: null,
+    editUrl: '/tablemodelview/edit',
     mapStateToProps: (state) => ({
       choices: state.datasources || [],
     }),