Mutation only updating messages for individual conversation, but not Conversations for User

Conversation.js

createMessage(){
      Relay.Store.update(new CreateMessageMutation({
        user: this.props.user,
        conversation: foundEdge.node,
        receiverId: receiverId,
        body: this.state.curText
      }), {onFailure, onSuccess});
}


export default Relay.createContainer(Conversation, {
  fragments: {
    user: () => Relay.QL`
      fragment on User {
        id
        rails_id
        username
        email
        conversations(first:100){
          edges{
            node{
              id
              rails_id
              last_message_time
              seller{
                rails_id
                username
              }
              buyer{
                rails_id
                username
              }
              ${CreateMessageMutation.getFragment('conversation')}
              messages(first:100){
                  edges{
                    node{
                      body
                      created_at
                      user{
                        rails_id
                        username
                      }
                    }
                  }
              }
            }
          }
        }
        ${CreateMessageMutation.getFragment('user')}
      }
    `,
  },
});

CreateMessageMutation.js

export default class CreateMessageMutation extends Relay.Mutation {
	static fragments = {
		// TODO update 'read' field in DB
	    conversation: () => Relay.QL`
	      fragment on Conversation {
	        id,
	        last_message_time
	      }
	    `,
	    user: () => Relay.QL`
	      fragment on User {
	        id
	      }
	    `,
  	};

  	getMutation() {
    	return Relay.QL`mutation{createMessage}`;
  	}

  	getFatQuery() {
	    return Relay.QL`
	      fragment on CreateMessagePayload {
	        MessageEdge,
	        conversation{
	          id
	          last_message_time
	          messages{
	            edges{
	              node{
	                id
	              }
	            }
	          }
	        },
	        user {
	          conversations(first: 100) {
	            edges {
	              node {
	              	last_message_time
	                messages{
	                  edges{
	                    node{
	                     id
	                    }
	                  }
	                }
	              }
	            }
	          }
	        }
	      }
	    `;
	}

	getConfigs() {
		return [{
	      
	      type: 'FIELDS_CHANGE',
	      fieldIDs: {
	        user: this.props.user.id,
	      },
	    },

	    {
	      type: 'RANGE_ADD',
	      parentName: 'conversation',
	      parentID: this.props.conversation.id,
	      connectionName: 'messages',
	      edgeName: 'MessageEdge',
	      rangeBehaviors: {
	        '': 'append',
	      },
	    }];
	}

	getVariables () {
	    return {
	   	  senderId: this.props.user.id, 
	   	  receiverId: this.props.receiverId,
	   	  conversationId: this.props.conversation.id,
	   	  body: this.props.body
	    }
	}
}