diff --git a/packages/strapi-bookshelf/lib/index.js b/packages/strapi-bookshelf/lib/index.js
index a09fc90e8c..29e4001013 100755
--- a/packages/strapi-bookshelf/lib/index.js
+++ b/packages/strapi-bookshelf/lib/index.js
@@ -227,7 +227,7 @@ module.exports = function(strapi) {
 
               // Build associations key
               utilsModels.defineAssociations(
-                definition.globalName,
+                model.toLowerCase(),
                 definition,
                 details,
                 name
diff --git a/packages/strapi-bookshelf/package.json b/packages/strapi-bookshelf/package.json
index fffc8ed841..26c2ea11f0 100755
--- a/packages/strapi-bookshelf/package.json
+++ b/packages/strapi-bookshelf/package.json
@@ -55,4 +55,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}
\ No newline at end of file
diff --git a/packages/strapi-mongoose/lib/index.js b/packages/strapi-mongoose/lib/index.js
index 0b1cf3ba84..31f83b0c29 100755
--- a/packages/strapi-mongoose/lib/index.js
+++ b/packages/strapi-mongoose/lib/index.js
@@ -205,7 +205,7 @@ module.exports = function (strapi) {
                 const verbose = _.get(utilsModels.getNature(details, name, undefined, model.toLowerCase()), 'verbose') || '';
 
                 // Build associations key
-                utilsModels.defineAssociations(model, definition, details, name);
+                utilsModels.defineAssociations(model.toLowerCase(), definition, details, name);
 
                 if (_.isEmpty(verbose)) {
                   definition.loadedModel[name].type = utils(instance).convertType(details.type);
diff --git a/packages/strapi-plugin-content-manager/config/queries/bookshelf.js b/packages/strapi-plugin-content-manager/config/queries/bookshelf.js
index 512b3f32ee..e5a30a8481 100755
--- a/packages/strapi-plugin-content-manager/config/queries/bookshelf.js
+++ b/packages/strapi-plugin-content-manager/config/queries/bookshelf.js
@@ -11,9 +11,13 @@ module.exports = {
         qb.orderBy(params.sort);
       }
 
-      qb.offset(_.toNumber(params.skip));
+      if (params.skip) {
+        qb.offset(_.toNumber(params.skip));
+      }
 
-      qb.limit(_.toNumber(params.limit));
+      if (params.limit) {
+        qb.limit(_.toNumber(params.limit));
+      }
     }).fetchAll({
       withRelated: this.associations.map(x => x.alias)
     });
@@ -39,14 +43,14 @@ module.exports = {
 
   create: async function (params) {
     const entry = await this
-      .forge()
-      .save(Object.keys(params.values).reduce((acc, current) => {
+      .forge(Object.keys(params.values).reduce((acc, current) => {
       if (this._attributes[current].type) {
         acc[current] = params.values[current];
       }
 
       return acc;
     }, {}))
+      .save()
     .catch((err) => {
       if (err.detail) {
         const field = _.last(_.words(err.detail.split('=')[0]));
diff --git a/packages/strapi-plugin-users-permissions/config/queries/bookshelf.js b/packages/strapi-plugin-users-permissions/config/queries/bookshelf.js
index efcd6ca2e5..e34302b8f6 100644
--- a/packages/strapi-plugin-users-permissions/config/queries/bookshelf.js
+++ b/packages/strapi-plugin-users-permissions/config/queries/bookshelf.js
@@ -1,42 +1,49 @@
 const _ = require('lodash');
 
 module.exports = {
-  find: async function (params) {
-    const records = this.query(function(qb) {
+  find: async function (params = {}, populate) {
+    const records = await this.query(function(qb) {
       _.forEach(params.where, (where, key) => {
         qb.where(key, where[0].symbol, where[0].value);
       });
 
       if (params.sort) {
-        qb.orderBy(params.sort);
+        qb.orderByRaw(params.sort);
       }
 
-      qb.offset(params.start);
+      if (params.start) {
+        qb.offset(params.start);
+      }
 
-      qb.limit(params.limit);
+      if (params.limit) {
+        qb.limit(params.limit);
+      }
     }).fetchAll({
-      withRelated: _.keys(_.groupBy(_.reject(this.associations, {autoPopulate: false}), 'alias'))
+      withRelated: populate || _.keys(_.groupBy(_.reject(this.associations, { autoPopulate: false }), 'alias'))
     });
 
     return records ? records.toJSON() : records;
   },
 
-  count: async function (params) {
+  count: async function (params = {}) {
     return await this
-      .forge()
+      .where(params)
       .count();
   },
 
-  findOne: async function (params) {
-    if (_.get(params, '_id')) {
-      params.id = params._id;
-      delete params._id;
+  findOne: async function (params, populate) {
+    const primaryKey = params[this.primaryKey] || params.id;
+
+    if (primaryKey) {
+      params = {
+        [this.primaryKey]: primaryKey
+      }
     }
 
     const record = await this
       .forge(params)
       .fetch({
-        withRelated: this.associations.map(x => x.alias)
+        withRelated: populate || this.associations.map(x => x.alias)
       });
 
     return record ? record.toJSON() : record;
@@ -46,20 +53,20 @@ module.exports = {
     return this
       .forge()
       .save(Object.keys(params).reduce((acc, current) => {
-      if (_.get(this, ['_attributes', current, 'type'])) {
-        acc[current] = params[current];
-      }
+        if (_.get(this._attributes, [current, 'type']) || _.get(this._attributes, [current, 'model'])) {
+          acc[current] = params[current];
+        }
 
-      return acc;
-    }, {}))
-    .catch((err) => {
-      if (err.detail) {
-        const field = _.last(_.words(err.detail.split('=')[0]));
-        err = { message: `This ${field} is already taken`, field };
-      }
+        return acc;
+      }, {}))
+      .catch((err) => {
+        if (err.detail) {
+          const field = _.last(_.words(err.detail.split('=')[0]));
+          err = { message: `This ${field} is already taken`, field };
+        }
 
-      throw err;
-    });
+        throw err;
+      });
   },
 
   update: async function (search, params = {}) {
@@ -72,19 +79,25 @@ module.exports = {
     if (primaryKey) {
       search = {
         [this.primaryKey]: primaryKey
+      };
+    } else {
+      const entry = await module.exports.findOne.call(this, search);
+
+      search = {
+        [this.primaryKey]: entry[this.primaryKey] || entry.id
       }
     }
 
     return this.forge(search)
-    .save(params, {
-      patch: true
-    })
-    .catch((err) => {
-      const field = _.last(_.words(err.detail.split('=')[0]));
-      const error = { message: `This ${field} is already taken`, field };
+      .save(params, {
+        patch: true
+      })
+      .catch((err) => {
+        const field = _.last(_.words(err.detail.split('=')[0]));
+        const error = { message: `This ${field} is already taken`, field };
 
-      throw error;
-    });
+        throw error;
+      });
   },
 
   delete: async function (params) {
@@ -107,8 +120,8 @@ module.exports = {
 
   addPermission: async function (params) {
     return this
-      .forge()
-      .save(params);
+      .forge(params)
+      .save();
   },
 
   removePermission: async function (params) {
diff --git a/packages/strapi-plugin-users-permissions/config/queries/mongoose.js b/packages/strapi-plugin-users-permissions/config/queries/mongoose.js
index 747a10acff..5117d0daf9 100644
--- a/packages/strapi-plugin-users-permissions/config/queries/mongoose.js
+++ b/packages/strapi-plugin-users-permissions/config/queries/mongoose.js
@@ -17,11 +17,12 @@ module.exports = {
   },
 
   findOne: async function (params, populate) {
-    if (!params[this.primaryKey] && params.id) {
-      params[this.primaryKey] = params.id;
-      delete params.id;
-    } else if (params.id) {
-      delete params.id;
+    const primaryKey = params[this.primaryKey] || params.id;
+
+    if (primaryKey) {
+      params = {
+        [this.primaryKey]: primaryKey
+      }
     }
 
     return this
diff --git a/packages/strapi-plugin-users-permissions/controllers/Auth.js b/packages/strapi-plugin-users-permissions/controllers/Auth.js
index 2e7f11cb3a..96bc2a47e1 100644
--- a/packages/strapi-plugin-users-permissions/controllers/Auth.js
+++ b/packages/strapi-plugin-users-permissions/controllers/Auth.js
@@ -158,13 +158,14 @@ module.exports = {
       return ctx.badRequest(null, ctx.request.admin ? [{ messages: [{ id: 'Auth.form.error.password.format' }] }] : 'Your password cannot contain more than three times the symbol `$`.');
     }
 
+    // Retrieve root role.
+    const root = await strapi.query('role', 'users-permissions').findOne({ type: 'root' }, ['users']);
+
     // First, check if the user is the first one to register as admin.
-    const hasAdmin = await strapi.query('user', 'users-permissions').count(strapi.utils.models.convertParams('user', { type: 'root' }));
+    const hasAdmin = root.users.length > 0;
 
     // Check if the user is the first to register
-    const role = hasAdmin < 1 ?
-      await strapi.query('role', 'users-permissions').findOne({ type: 'root' }, []):
-      await strapi.query('role', 'users-permissions').findOne({ type: 'guest' }, []);
+    const role = hasAdmin === false ? root : await strapi.query('role', 'users-permissions').findOne({ type: 'guest' }, []);
 
     if (!role) {
       return ctx.badRequest(null, ctx.request.admin ? [{ messages: [{ id: 'Auth.form.error.role.notFound' }] }] : 'Impossible to find the root role.');
@@ -180,7 +181,6 @@ module.exports = {
         jwt: strapi.plugins['users-permissions'].services.jwt.issue(user),
         user: _.omit(user.toJSON ? user.toJSON() : user, ['password', 'resetPasswordToken'])
       });
-
     } catch(err) {
       const adminError = _.includes(err.message, 'username') ? 'Auth.form.error.username.taken' : 'Auth.form.error.email.taken';
 
diff --git a/packages/strapi-plugin-users-permissions/services/UsersPermissions.js b/packages/strapi-plugin-users-permissions/services/UsersPermissions.js
index e58c18c258..2f2756341e 100644
--- a/packages/strapi-plugin-users-permissions/services/UsersPermissions.js
+++ b/packages/strapi-plugin-users-permissions/services/UsersPermissions.js
@@ -17,7 +17,7 @@ module.exports = {
       return new Error('This feature requires to install the Content Manager plugin');
     }
 
-    const role = await strapi.query('role', 'users-permissions').create(_.omit(params, ['users', 'permissions']));
+    const role = await strapi.query('role', 'users-permissions').create(_.omit(params, ['users', 'permissions', 'type']));
 
     const arrayOfPromises = Object.keys(params.permissions).reduce((acc, type) => {
       Object.keys(params.permissions[type].controllers).forEach(controller => {
@@ -53,6 +53,10 @@ module.exports = {
       throw new Error('Cannot found this role');
     }
 
+    if (role.type === 'root') {
+      return new Error(`You cannot delete the root admin role.`);
+    }
+
     // Move users to guest role.
     const arrayOfPromises = role.users.reduce((acc, user) => {
       acc.push(strapi.query('user', 'users-permissions').update({
@@ -149,7 +153,7 @@ module.exports = {
     // Group by `type`.
     role.permissions = role.permissions.reduce((acc, permission) => {
       _.set(acc, `${permission.type}.controllers.${permission.controller}.${permission.action}`, {
-        enabled: permission.enabled,
+        enabled: _.toNumber(permission.enabled) == true,
         policy: permission.policy
       });
 
@@ -339,6 +343,7 @@ module.exports = {
         arrayOfPromises.push(this.updateUserRole(user, guest._id || guest.id));
       });
 
+
     return Promise.all(arrayOfPromises);
   },