I have one array like "house". Each house object has multiple parameters like id, name, images, address. And i am showing all these in table view. Now i have one parameter key name.
I have to loop in to my house array , and find out the name which is contain in my array and i have to find out the Index.
So that in my table view i need to scroll that particular house item to top.
Any solution how can i achieve that.
Eg: Array - > [[id, name, image,address], [id, name, image,address], [id, name, image,address], [id, name, image,address]]
I have one key : "name".
I have to loop in to my array and get the index, so that i can scroll to that particular index.
Thanks
You can use the functions firstIndexOf and lastIndexOf functions available in swift. You can find details on How to find index of list item in Swift?
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I have the following situation:
I have an object
This object has an item that is an object again
The second object contains array of objects with ids
Can I filter only the parent objects that have subobjects that contain something in particular in the array on the bottom of the tree?
Try this:
$filter=nameOfObjectArrayProperty/any(o: contains(o/id, 'some-alue'))
or
$filter=nameOfObjectArrayProperty/any(o: o/id eq 'some-value')
It's also important to note that "/any" can be replaced with "/all" if you want all the subobjects to match your filter criteria.
Picture linked below as this is a bit tangled:
I am working with a data set that has "nested" values. There are three different types of entries: categories, then subcategories that are nested under the categories, then individual items that are nested under the subcategories (picture linked below). The entries are matched up using a filter system. Column A has the entry type, column B has the actual value, column C has the filter. The filter is always the value of entry you are nesting under. So, for a subcategory entry, Column A= "Subcategory", Column B= [name of subcategory] Column C = Column B of the category type entry above (the name of category it belongs to).
I need a way to automatically fill in the filters.
The way I am thinking I could do this is to search Column A (moving up) for the first instance of the entry type I need, and then return the value of the Column B cell in that row. Is this possible?
Given your exact data above (looking only at A14:C), delete everything from C14:C (including the header) and place the following formula in C14:
=ArrayFormula({"FILTER"; IF((A15:A="") + (A15:A="Category"),, IF(A15:A="Subcategory", VLOOKUP(ROW(A15:A), FILTER({ROW(A15:A), B15:B}, A15:A="Category"), 2, TRUE), VLOOKUP(ROW(A15:A), FILTER({ROW(A15:A), B15:B}, A15:A="Subcategory"), 2, TRUE)))})
This will create the title (which you can edit within the formula itself as you like) and all results for non-null rows thereafter.
You'll need to adjust the 15 in ranges to whatever the starting row of your non-header data actually is in your sheet.
I am totally stuck on this issue and I cannot find any answer on my doubt.
I will try to explain in the best way possible but that's pretty hard.
So, I have got a first model(Recipe), that stores inside the column ingredients all the ingredients inside an array. I also have an Ingredients model, which is connected through a join table to Recipe, that has as the first column the names of all the ingredients available.
I would like to include inside my search method a query that turns the ingredients.name column into an array and return back from the search method only those recipes whose array of ingredients is fully contained in ingredients.name array.
I tried with this
recipes = recipes.joins(:ingrediantizations).where('array_agg('ingredients.name') #> recipe.ingredients')
But it is not giving the right resuslt - ingrediantizations is the join table.
Hope you can help me out!
After a couple of day of wrapping my head around this, I finally got to the solution.
I post it so that someone could benefit for it.
The second step could seem weird but it is, I guess, the only way to make an array with curly brackets, as required for literal arrays in PSQL.
Ingredients was the attribute storing the ingredients in an array.
items = Item.pluck(:name)
items = "{#{ items.map {|term| %Q("#{ term }") }.join(",") }}"
recipes=recipes.where("ingredients <#?", "#{items}")
Hopefully this is a little clearer. I'm sorry but I'm very new to coding in general. I have multiple tables that I have to query in succession in order to get to the correct array that I need. The following logic for the query is as follows:
this gives me an array based upon the store :id
store = Stores.find(params[:id])
this gives me another array based upon the param .location found in the table store where that value equals the row ID in the table Departments
department = Departments.find(store.location)
I need to preform one last query but in order to do so I need to figure out which day of the meeting is needed. In order to do this I have to create the parameter day_of_meeting found in the table Stores. I try to call it from the array above and create a new variable. In the Table Departments, I there are params such as day_1, day_2 and so on. I need to be able to call something like department.day_1 or department.day_2. Thus, I'm trying to actually create the variable by join the words "department.day_" to the variable store.day_of_meeting which would equal some integer, creating department.day_1...
which_day = ["department.day_", store.day_of_meeting].join("")
This query finds uses the value found from the variable department.day_1 to query table Meeting to find the values in the corresponding row.
meeting = Meeting.find(which_day)
Does this make my problem any clearer to understand?
findmethod can only accept parameters like Meeting.find(1) or Meeting.find("1-xx").
so, what you need is Meeting.find(department.send("day_" + store.day_of_meeting.to_s))
Hope to help!
I have one array, which are IDs from one ActiveRecord table.
so I would like to sort that array based on last name which is associated with that ID...how can I do that?
To clarify:
array #students=[], inside are IDs and I would like to sort by Student.find(ID).last
Thank you.
Dorijan
Without fully understanding the question, if you're given a list of id's, you can sort by last_name when you're doing the query:
Student.where("id IN (?)", #students).order(:last_name)
Of course, this assumes that #students is an array of ids and nothing else.
Responding to your comment, I'm not sure why you'd need to do that, but if your #student array is just a list of ids ignorant of the Student model and its attributes, and you would still like to order that array, you can do this:
#students = Student.where("id IN (?)", #students).order(:last_name).collect(&:id)
This will return an array of ids sorted by last name. But again, I don't really know what you have going on behind the scenes, and I'm not sure what you're asking for.
Based on your comment, you want to do the following:
Take in a list of IDs of students as input
Return a list of IDs ordered by the student's last name in the database.
You should be able to do the following:
Student.where(:id => #ids).order(:last_name).map(&:id)
Breaking this down:
where(:id => #ids) only selects Students with an ID in the ID array.
order(:last_name) sorts the results by last name.
map(&:id) takes in an array of Students and returns just the ID column. Essentially, the method in brackets (which is a shortcut for calling id for each student) is called for each student found, and the return values are assembled into a new array (which will only contain the ids).
Some gotchas:
If an ID doesn't exist in the database, it will be excluded from the results - if your result array is smaller than your input array, you may be trying to access a record that no longer exists.
If the Students table has a lot of columns, you may want to consider calling select(:id) so that you don't pull every column of the Student records from the database.
Student.find( #students ).sort_by { |s| s.last_name }