diff --git a/src/services/cooperation.js b/src/services/cooperation.js
index 5de10ce8..0e544e14 100644
--- a/src/services/cooperation.js
+++ b/src/services/cooperation.js
@@ -1,7 +1,7 @@
-const mongoose = require('mongoose')
 const Cooperation = require('~/models/cooperation')
 const mergeArraysUniqueValues = require('~/utils/mergeArraysUniqueValues')
 const removeArraysUniqueValues = require('~/utils/removeArraysUniqueValues')
+const getCooperationByIdPipeline = require('~/utils/cooperations/getCooperationByIdPipeline')
 const handleResources = require('~/utils/handleResources')
 const { createError, createForbiddenError } = require('~/utils/errorsHelper')
 const { VALIDATION_ERROR, DOCUMENT_NOT_FOUND, ROLE_REQUIRED_FOR_ACTION } = require('~/consts/errors')
@@ -25,444 +25,12 @@ const cooperationService = {
     return result
   },
 
-  getCooperationById: async function (id, userRole) {
-    const isStudent = userRole === roles.STUDENT
+  getCooperationById: async (id, userRole) => {
+    const isClosedResourcesHidden = userRole === roles.STUDENT
 
-    const cooperationById = await (isStudent
-      ? this.getCooperationByIdForStudent(id)
-      : this.getCooperationByIdForTutor(id))
+    const pipeline = getCooperationByIdPipeline(id, isClosedResourcesHidden)
 
-    return cooperationById
-  },
-
-  getCooperationByIdForTutor: async (id) => {
-    const cooperationById = await Cooperation.findById(id).populate([
-      { path: 'sections.resources.resource', select: '-createdAt -updatedAt' },
-      {
-        path: 'offer',
-        populate: [
-          {
-            path: 'category',
-            select: ['name', 'appearance']
-          },
-          {
-            path: 'subject',
-            select: 'name'
-          },
-          {
-            path: 'author',
-            select: ['firstName', 'lastName', 'photo', 'professionalSummary', 'totalReviews', 'FAQ', 'averageRating']
-          }
-        ],
-        select: ['id', 'author', 'category', 'subject', 'title', 'languages', 'proficiencyLevel', 'description']
-      },
-      {
-        path: 'initiator'
-      },
-      {
-        path: 'receiver'
-      }
-    ])
-
-    return cooperationById
-  },
-
-  getCooperationByIdForStudent: async (id) => {
-    const [cooperationById] = await Cooperation.aggregate([
-      {
-        $match: {
-          _id: mongoose.Types.ObjectId(id)
-        }
-      },
-      {
-        $set: {
-          sections: {
-            $map: {
-              input: '$sections',
-              as: 'section',
-              in: {
-                _id: '$$section._id',
-                title: '$$section.title',
-                description: '$$section.description',
-                resources: {
-                  $filter: {
-                    input: '$$section.resources',
-                    as: 'resource',
-                    cond: {
-                      $eq: ['$$resource.availability.status', 'open']
-                    }
-                  }
-                }
-              }
-            }
-          }
-        }
-      },
-      {
-        $unwind: {
-          path: '$sections',
-          includeArrayIndex: 'sections.sectionOrder',
-          preserveNullAndEmptyArrays: true
-        }
-      },
-      {
-        $unwind: {
-          path: '$sections.resources',
-          preserveNullAndEmptyArrays: true
-        }
-      },
-      {
-        $lookup: {
-          from: 'attachments',
-          localField: 'sections.resources.resource',
-          foreignField: '_id',
-          as: 'attachment'
-        }
-      },
-      {
-        $lookup: {
-          from: 'lessons',
-          localField: 'sections.resources.resource',
-          foreignField: '_id',
-          as: 'lesson'
-        }
-      },
-      {
-        $lookup: {
-          from: 'quizzes',
-          localField: 'sections.resources.resource',
-          foreignField: '_id',
-          as: 'quiz'
-        }
-      },
-      {
-        $lookup: {
-          from: 'questions',
-          localField: 'sections.resources.resource',
-          foreignField: '_id',
-          as: 'question'
-        }
-      },
-      {
-        $set: {
-          'sections.resources.resource': {
-            $switch: {
-              branches: [
-                {
-                  case: {
-                    $eq: ['$sections.resources.resourceType', 'attachment']
-                  },
-                  then: {
-                    $first: '$attachment'
-                  }
-                },
-                {
-                  case: {
-                    $eq: ['$sections.resources.resourceType', 'lesson']
-                  },
-                  then: {
-                    $first: '$lesson'
-                  }
-                },
-                {
-                  case: {
-                    $eq: ['$sections.resources.resourceType', 'quiz']
-                  },
-                  then: {
-                    $first: '$quiz'
-                  }
-                },
-                {
-                  case: {
-                    $eq: ['$sections.resources.resourceType', 'question']
-                  },
-                  then: {
-                    $first: '$question'
-                  }
-                }
-              ],
-              default: '$$REMOVE'
-            }
-          }
-        }
-      },
-      {
-        $group: {
-          _id: '$sections._id',
-          resources: {
-            $push: '$sections.resources'
-          },
-          cooperationId: {
-            $first: '$_id'
-          },
-          offer: {
-            $first: '$offer'
-          },
-          initiator: {
-            $first: '$initiator'
-          },
-          initiatorRole: {
-            $first: '$initiatorRole'
-          },
-          receiver: {
-            $first: '$receiver'
-          },
-          receiverRole: {
-            $first: '$receiverRole'
-          },
-          title: {
-            $first: '$title'
-          },
-          additionalInfo: {
-            $first: '$additionalInfo'
-          },
-          proficiencyLevel: {
-            $first: '$proficiencyLevel'
-          },
-          price: {
-            $first: '$price'
-          },
-          status: {
-            $first: '$status'
-          },
-          needAction: {
-            $first: '$needAction'
-          },
-          availableQuizzes: {
-            $first: '$availableQuizzes'
-          },
-          finishedQuizzes: {
-            $first: '$finishedQuizzes'
-          },
-          sections: {
-            $first: '$sections'
-          },
-          createdAt: {
-            $first: '$createdAt'
-          },
-          updatedAt: {
-            $first: '$updatedAt'
-          },
-          sectionOrder: {
-            $first: '$sectionOrder'
-          }
-        }
-      },
-      {
-        $sort: {
-          'sections.sectionOrder': 1
-        }
-      },
-      {
-        $set: {
-          _id: '$cooperationId',
-          resources: '$$REMOVE',
-          cooperationId: '$$REMOVE',
-          'sections.sectionOrder': '$$REMOVE',
-          'sections.resources': {
-            $filter: {
-              input: '$resources',
-              as: 'resource',
-              cond: { $ne: ['$$resource', {}] }
-            }
-          }
-        }
-      },
-      {
-        $set: {
-          sections: {
-            $cond: {
-              if: {
-                $eq: ['$sections', { resources: [] }]
-              },
-              then: '$$REMOVE',
-              else: '$sections'
-            }
-          }
-        }
-      },
-      {
-        $group: {
-          _id: '$_id',
-          offer: {
-            $first: '$offer'
-          },
-          initiator: {
-            $first: '$initiator'
-          },
-          initiatorRole: {
-            $first: '$initiatorRole'
-          },
-          receiver: {
-            $first: '$receiver'
-          },
-          receiverRole: {
-            $first: '$receiverRole'
-          },
-          title: {
-            $first: '$title'
-          },
-          additionalInfo: {
-            $first: '$additionalInfo'
-          },
-          proficiencyLevel: {
-            $first: '$proficiencyLevel'
-          },
-          price: {
-            $first: '$price'
-          },
-          status: {
-            $first: '$status'
-          },
-          needAction: {
-            $first: '$needAction'
-          },
-          availableQuizzes: {
-            $first: '$availableQuizzes'
-          },
-          finishedQuizzes: {
-            $first: '$finishedQuizzes'
-          },
-          sections: {
-            $push: '$sections'
-          },
-          createdAt: {
-            $first: '$createdAt'
-          },
-          updatedAt: {
-            $first: '$updatedAt'
-          }
-        }
-      },
-      {
-        $lookup: {
-          from: 'users',
-          localField: 'initiator',
-          foreignField: '_id',
-          as: 'initiator'
-        }
-      },
-      {
-        $lookup: {
-          from: 'users',
-          localField: 'receiver',
-          foreignField: '_id',
-          as: 'receiver'
-        }
-      },
-      {
-        $lookup: {
-          from: 'offers',
-          localField: 'offer',
-          foreignField: '_id',
-          as: 'offer',
-          pipeline: [
-            {
-              $lookup: {
-                from: 'categories',
-                localField: 'category',
-                foreignField: '_id',
-                as: 'category'
-              }
-            },
-            {
-              $lookup: {
-                from: 'users',
-                localField: 'author',
-                foreignField: '_id',
-                as: 'author'
-              }
-            },
-            {
-              $lookup: {
-                from: 'subjects',
-                localField: 'subject',
-                foreignField: '_id',
-                as: 'subject'
-              }
-            },
-            {
-              $set: {
-                author: {
-                  $first: ['$author']
-                },
-                category: {
-                  $first: ['$category']
-                },
-                subject: {
-                  $first: ['$subject']
-                }
-              }
-            },
-            {
-              $project: {
-                _id: true,
-                author: {
-                  _id: true,
-                  firstName: true,
-                  lastName: true,
-                  photo: true,
-                  professionalSummary: true,
-                  totalReviews: true,
-                  FAQ: true,
-                  averageRating: true
-                },
-                category: {
-                  _id: true,
-                  name: true,
-                  appearance: true
-                },
-                subject: {
-                  _id: true,
-                  name: true
-                },
-                title: true,
-                languages: true,
-                proficiencyLevel: true,
-                description: true
-              }
-            }
-          ]
-        }
-      },
-      {
-        $set: {
-          initiator: {
-            $first: ['$initiator']
-          },
-          receiver: {
-            $first: ['$receiver']
-          },
-          offer: {
-            $first: ['$offer']
-          }
-        }
-      },
-      {
-        $project: {
-          initiator: {
-            appLanguage: false,
-            bookmarkedOffers: false,
-            isEmailConfirmed: false,
-            isFirstLogin: false,
-            lastLoginAs: false,
-            password: false
-          },
-          receiver: {
-            appLanguage: false,
-            bookmarkedOffers: false,
-            isEmailConfirmed: false,
-            isFirstLogin: false,
-            lastLoginAs: false,
-            password: false
-          },
-          'sections.resources.resource': {
-            createdAt: false,
-            updatedAt: false
-          }
-        }
-      }
-    ])
+    const [cooperationById] = await Cooperation.aggregate(pipeline)
 
     return cooperationById
   },