relationship

问题 I have asked reference question in this link.I got answer using NSMangedObjectID.Now I have used below function to get Component entity from its componentID.As in the API response of SyncSurveyWebReadings,I only get componentId,I need to fetch Component entity & set as relationship.Now time taking issue is not there.But may be relationship is not getting set.When I print the relationship object I got, Optional<Array<SurveyReadingWeb>> ▿ some : 1 element - 0 : <GazSurvey_Dev.SurveyReadingWeb:

问题 I have asked reference question in this link.I got answer using NSMangedObjectID.Now I have used below function to get Component entity from its componentID.As in the API response of SyncSurveyWebReadings,I only get componentId,I need to fetch Component entity & set as relationship.Now time taking issue is not there.But may be relationship is not getting set.When I print the relationship object I got, Optional<Array<SurveyReadingWeb>> ▿ some : 1 element - 0 : <GazSurvey_Dev.SurveyReadingWeb:

问题 In my laravel project I created three tables as employees , teams and employee_teams . There is many to many relationship in "employee_teams" tables, with the foreign keys of employee_id and team_id . "employee_teams" table DB structure id | employee_id | team_id In the Employee form there is a multi-select dropdown which helps to assign multiple teams for the particular employee. <select name="namedropdown[]" id="namedropdown" class="selectpicker" multiple data-live-search="true"> <option

问题 In my laravel project I created three tables as employees , teams and employee_teams . There is many to many relationship in "employee_teams" tables, with the foreign keys of employee_id and team_id . "employee_teams" table DB structure id | employee_id | team_id In the Employee form there is a multi-select dropdown which helps to assign multiple teams for the particular employee. <select name="namedropdown[]" id="namedropdown" class="selectpicker" multiple data-live-search="true"> <option

问题 I have a question about database relationship I am trying to build a monitoring system with the following rules : Channels belongs to one Sensor Sensors belongs to one Device Devices belongs to one Probe Probes belongs to one Core Here is a preview of the tables +-------------+ +-------------+ | Cores | | Probes | +-------------+ +-------------+ | id | | id | | fields ... | | fields ... | +-------------+ | core_id | +-------------+ +-------------+ +-------------+ +-------------+ | Devices | |

问题 I have a question about database relationship I am trying to build a monitoring system with the following rules : Channels belongs to one Sensor Sensors belongs to one Device Devices belongs to one Probe Probes belongs to one Core Here is a preview of the tables +-------------+ +-------------+ | Cores | | Probes | +-------------+ +-------------+ | id | | id | | fields ... | | fields ... | +-------------+ | core_id | +-------------+ +-------------+ +-------------+ +-------------+ | Devices | |

问题 Here's what I want to achieve, we have Staff and every staff can have one Position for a department, as well as one Designation for a department and multiple Additional Charges for multiple departments, one department per Additional Charge . And I want to store all the responsibilities in the staff_responsibilities table I have a staff table with the following columns id name email Then I have staff_responsibilities table with the following columns: staff_id designation_id department_id

问题 I'm trying to create a simple relationship between tables : - attribute_type - id name - category - id name description So I created a pivot table to link them : - attribute_type_category - attribute_type_id category_id There is the model relationships : On AttributeType.php public function category() { return $this->belongsToMany('App\AttributeTypeCategory', 'attribute_type_category', 'attribute_type_id', 'category_id'); } On AttributeTypeCategory.php public function category() { return

问题 I'm trying to create a simple relationship between tables : - attribute_type - id name - category - id name description So I created a pivot table to link them : - attribute_type_category - attribute_type_id category_id There is the model relationships : On AttributeType.php public function category() { return $this->belongsToMany('App\AttributeTypeCategory', 'attribute_type_category', 'attribute_type_id', 'category_id'); } On AttributeTypeCategory.php public function category() { return

问题 I'm trying to create a simple relationship between tables : - attribute_type - id name - category - id name description So I created a pivot table to link them : - attribute_type_category - attribute_type_id category_id There is the model relationships : On AttributeType.php public function category() { return $this->belongsToMany('App\AttributeTypeCategory', 'attribute_type_category', 'attribute_type_id', 'category_id'); } On AttributeTypeCategory.php public function category() { return