CODEWITHSUNDEEP
swiftparse-platform
Hunter
Hunter

Reputation: 421

parse: check column then use data in that row

enter image description here

Is it possible to check the Parse column "ID" for 0 (any number) then if 0 (the one in the column) equals indexPath.row 0 (the first cell) it displays the data from the row of 0 in Parse? The picture above is the class for the viewcontroller, the tableview cell data is in another class.

ID: number that will be checked with the indexPath.row

navTitle: navigation bar title

articleTitle: UILabel

written: UILabel

date: UILabel

article: UITextView

Edit for possible duplicate: It is not a duplicate, the other question answers how to move data from a cell to a view controller using prepareForSegue. This question is asking how, if possible, to check a column on Parse and if a number in that column matches an indexPath.row it will use the data from that row to which the number corresponds.

Upvotes: 1

Views: 112

Answers (1)

Jordan H
Jordan H

Reputation: 55825

I now understand you would like to show the data that is appropriate for a given index path in a detail view controller, after they tap on the cell at said index path. This is assuming you are correctly showing the appropriate data in the table view, and now the question is how to obtain and show the relevant data for the row the user tapped on in a new view controller.

To do this, you could add an internal property to your detail view controller that is an Int. Set this property to the table view's selected index path's row before the detail view controller is shown, perhaps in prepareForSegue for example. 

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if let detailVC = segue.destinationViewController as? DetailViewController {
        if let selectedIndexPath = self.tableView.indexPathForSelectedRow {
            detailVC.integerIdentifier = selectedIndexPath.row
        }
    }
}

Now in that detail view controller, you can access the property's value and query for the information you need from Parse given that value. (And you'll likely want to display some feedback to the user to inform them you're downloading the appropriate data to display.) For example, you could have the following code in a function you call from viewDidLoad:

let query = PFQuery(className: "eventsDetail")
query.whereKey("ID", equalTo: self.integerIdentifier)
query.getFirstObjectInBackgroundWithBlock { (detail: PFObject?, error: NSError?) -> Void in
    //update your labels etc using the detail (Optional) PFObject
}

I want to note, importantly, that this is not a great way to store the data in Parse. One should not tie the data to how it will be displayed, which is the case here tying an identifier to the index path, forcing item with ID 0 to magically be the article details appropriate for the first cell in the table. You may wish to revisit the database design. For example, perhaps your other class that is used to generate a list of events could have a pointer to the event detail class, which would allow you to obtain the event details before you select an event and not have to query again for details.



Original Answer:
I understand you would like to show the data in this Parse class in your app in a table view, where the first table view cell displays the data for ID 0, the second cell displays the data for ID 1, etc.

To accomplish this, you'll want to query this class and apply an ascending order on the "ID" column. You will get back an array of PFObjects that are sorted as desired - lowest to highest ID, which you can use for your table view's data source to map them one-to-one.

Your query may look something like this:

let query = PFQuery(className: "Article")
query.orderByAscending("ID")
query.findObjectsInBackgroundWithBlock { (articles: [PFObject]?, error: NSError?) -> Void in
    //use articles array as the data source, update the interface
    self.articles = articles
    self.tableView.reloadData()
}

Now in your table view data source methods, use this array to populate the table:

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.articles.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let article = self.articles[indexPath.row]
    //... configure cell, show article title, etc, return cell
}

Upvotes: 1

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