diff --git a/packages/vulcan-core/lib/modules/containers/withMulti.js b/packages/vulcan-core/lib/modules/containers/withMulti.js
index 0500c218f..22f36c5e0 100644
--- a/packages/vulcan-core/lib/modules/containers/withMulti.js
+++ b/packages/vulcan-core/lib/modules/containers/withMulti.js
@@ -61,7 +61,7 @@ export default function withMulti(options) {
   const { fragmentName, fragment } = extractFragmentInfo(options, collectionName);
 
   const typeName = collection.options.typeName;
-  const resolverName = Utils.camelCaseify(Utils.pluralize(typeName));
+  const resolverName = collection.options.multiResolverName;
 
   // build graphql query from options
   const query = gql`
@@ -189,7 +189,7 @@ export default function withMulti(options) {
                   : providedTerms;
 
               return props.data.fetchMore({
-                variables: { terms: newTerms }, // ??? not sure about 'terms: newTerms'
+                variables: { input: { terms: newTerms } }, // ??? not sure about 'terms: newTerms'
                 updateQuery(previousResults, { fetchMoreResult }) {
                   // no more post to fetch
                   if (!fetchMoreResult.data) {
diff --git a/packages/vulcan-core/lib/modules/default_resolvers.js b/packages/vulcan-core/lib/modules/default_resolvers.js
index 7c675ae1b..449532fda 100644
--- a/packages/vulcan-core/lib/modules/default_resolvers.js
+++ b/packages/vulcan-core/lib/modules/default_resolvers.js
@@ -94,7 +94,7 @@ export function getDefaultResolvers(options) {
       description: `A single ${typeName} document fetched by ID or slug`,
 
       async resolver(root, { input = {} }, context, { cacheControl }) {
-        const { selector = {}, enableCache = false } = input;
+        const { selector = {}, enableCache = false, allowNull = false } = input;
 
         debug('');
         debugGroup(`--------------- start \x1b[35m${typeName} Single Resolver\x1b[0m ---------------`);
@@ -116,8 +116,12 @@ export function getDefaultResolvers(options) {
           : await Connectors.get(collection, selector);
 
         if (!doc) {
-          const MissingDocumentError = createError('app.missing_document', { message: 'app.missing_document' });
-          throw new MissingDocumentError({ data: { documentId, slug } });
+          if (allowNull) {
+            return { result: null };
+          } else {
+            const MissingDocumentError = createError('app.missing_document', { message: 'app.missing_document' });
+            throw new MissingDocumentError({ data: { documentId, slug } });
+          }
         }
 
         // if collection has a checkAccess function defined, use it to perform a check on the current document
@@ -137,4 +141,4 @@ export function getDefaultResolvers(options) {
       },
     },
   };
-}
\ No newline at end of file
+}
diff --git a/packages/vulcan-lib/lib/modules/collections.js b/packages/vulcan-lib/lib/modules/collections.js
index 34986a7cf..1fa1f809c 100644
--- a/packages/vulcan-lib/lib/modules/collections.js
+++ b/packages/vulcan-lib/lib/modules/collections.js
@@ -37,7 +37,7 @@ Mongo.Collection.prototype.attachSchema = function (schemaOrFields) {
   } else {
     this.simpleSchema().extend(schemaOrFields)
   }
-}
+};
 
 /**
  * @summary Add an additional field (or an array of fields) to a schema.
@@ -134,6 +134,8 @@ export const createCollection = options => {
   // add typeName if missing
   collection.typeName = typeName;
   collection.options.typeName = typeName;
+  collection.options.singleResolverName = Utils.camelCaseify(typeName);
+  collection.options.multiResolverName = Utils.camelCaseify(Utils.pluralize(typeName));
 
   // add collectionName if missing
   collection.collectionName = collectionName;
@@ -158,13 +160,13 @@ export const createCollection = options => {
         hidden: true,
         type: Array,
         isIntlData: true,
-      }
+      };
 
       delete schema[`${fieldName}_intl`].intl;
 
       schema[`${fieldName}_intl.$`] = {
         type: getIntlString(),
-      }
+      };
 
       // if original field is required, enable custom validation function instead of `optional` property
       if (!schema[fieldName].optional) {
@@ -287,9 +289,9 @@ export const createCollection = options => {
     // console.log(parameters);
 
     return parameters;
-  }
+  };
 
   Collections.push(collection);
 
   return collection;
-}
+};
diff --git a/packages/vulcan-lib/lib/modules/config.js b/packages/vulcan-lib/lib/modules/config.js
index 0329aee38..27d60550e 100644
--- a/packages/vulcan-lib/lib/modules/config.js
+++ b/packages/vulcan-lib/lib/modules/config.js
@@ -50,6 +50,7 @@ SimpleSchema.extendOptions([
   'options', // form options
   'query', // field-specific data loading query
   'selectable', // field can be used as part of a selector when querying for data
+  'unique', // field can be used as part of a selectorUnique when querying for data
   'orderable', // field can be used to order results when querying for data
 
   'intl', // set to `true` to make a field international
diff --git a/packages/vulcan-lib/lib/modules/graphql.js b/packages/vulcan-lib/lib/modules/graphql.js
index 3e0ac4f15..5704ec0ce 100644
--- a/packages/vulcan-lib/lib/modules/graphql.js
+++ b/packages/vulcan-lib/lib/modules/graphql.js
@@ -125,7 +125,7 @@ export const GraphQLSchema = {
     this.directives = deepmerge(this.directives, directive);
   },
   
-  // for a given schema, return main type fields, selector fields, 
+  // for a given schema, return main type fields, selector fields,
   // unique selector fields, orderBy fields, creatable fields, and updatable fields
   getFields(schema, typeName) {
     const fields = {
@@ -227,7 +227,17 @@ export const GraphQLSchema = {
         }
 
         if (field.selectable) {
-          // TODO
+          fields.selector.push({
+            name: fieldName,
+            type: inputFieldType,
+          });
+        }
+
+        if (field.selectable && field.unique) {
+          fields.selectorUnique.push({
+            name: fieldName,
+            type: inputFieldType,
+          });
         }
 
         if (field.orderable) {
@@ -289,13 +299,13 @@ export const GraphQLSchema = {
         const queryResolvers = {};
   
         // single
-        if (resolvers.single) { 
+        if (resolvers.single) {
           addGraphQLQuery(singleQueryTemplate({ typeName }), resolvers.single.description);
           queryResolvers[Utils.camelCaseify(typeName)] = resolvers.single.resolver.bind(resolvers.single);
         }
   
         // multi
-        if (resolvers.multi) { 
+        if (resolvers.multi) {
           addGraphQLQuery(multiQueryTemplate({ typeName }), resolvers.multi.description);
           queryResolvers[Utils.camelCaseify(Utils.pluralize(typeName))] = resolvers.multi.resolver.bind(resolvers.multi);
         }
diff --git a/packages/vulcan-lib/lib/modules/graphql_templates.js b/packages/vulcan-lib/lib/modules/graphql_templates.js
index 64912d92e..f920a6cdb 100644
--- a/packages/vulcan-lib/lib/modules/graphql_templates.js
+++ b/packages/vulcan-lib/lib/modules/graphql_templates.js
@@ -2,7 +2,7 @@ import { Utils } from './utils';
 
 export const convertToGraphQL = (fields, indentation) => {
   return fields.length > 0 ? fields.map(f => fieldTemplate(f, indentation)).join(`\n`) : '';
-}
+};
 
 export const arrayToGraphQL = fields => fields.map(f => `${f.name}: ${f.type}`).join(', ');
 
@@ -19,7 +19,7 @@ export const getArguments = args => {
   } else {
     return '';
   }
-}
+};
 
 /* ------------------------------------- Generic Field Template ------------------------------------- */
 
@@ -158,6 +158,8 @@ export const singleInputTemplate = ({ typeName }) =>
   selector: ${typeName}SelectorUniqueInput
   # Whether to enable caching for this query
   enableCache: Boolean
+  # Return null instead of throwing MissingDocumentError
+  allowNull: Boolean
 }`;
 
 /*
@@ -175,11 +177,11 @@ type MultiMovieInput {
 export const multiInputTemplate = ({ typeName }) =>
 `input Multi${typeName}Input {
   # A JSON object that contains the query terms used to fetch data
-  terms: JSON, 
+  terms: JSON,
   # How much to offset the results by
-  offset: Int, 
+  offset: Int,
   # A limit for the query
-  limit: Int, 
+  limit: Int,
   # Whether to enable caching for this query
   enableCache: Boolean
   # Whether to calculate totalCount for this query
@@ -348,7 +350,7 @@ export const createInputTemplate = ({ typeName }) =>
 
 /*
 
-Type for update mutation input argument 
+Type for update mutation input argument
 
 type UpdateMovieInput {
   selector: MovieSelectorUniqueInput!
@@ -540,4 +542,4 @@ export const deleteClientTemplate = ({ typeName, fragmentName }) =>
       ...${fragmentName}
     }
   }
-}`;
\ No newline at end of file
+}`;
diff --git a/packages/vulcan-users/lib/modules/permissions.js b/packages/vulcan-users/lib/modules/permissions.js
index 0b44937d6..c8905d698 100644
--- a/packages/vulcan-users/lib/modules/permissions.js
+++ b/packages/vulcan-users/lib/modules/permissions.js
@@ -205,6 +205,7 @@ Users.isAdminById = Users.isAdmin;
 Users.getViewableFields = function (user, collection, document) {
   return Utils.arrayToFields(_.compact(_.map(collection.simpleSchema()._schema,
     (field, fieldName) => {
+      if (fieldName.indexOf('.$') > -1) return null;
       return Users.canReadField(user, field, document) ? fieldName : null;
     }
   )));