We use google forms to send out tests to our students. We have a spreadsheet with rosters where we keep the info of the students (email, birthday, gender, guardian etc) for every class in our school. One roster per sheet. After we finalize and approve a form we immediately link the form to a Responses spreadsheet.We wonder whether we could (from the existing roster spreadsheet) automate the following workflow:  Create and fill-in with one of the email addresses, a single option checkbox question. This could be the first question of the form.  Generate a pre-filled link of the form with the above mentioned email address from the roster.  Append the generated pre-filled link to the Responses spreadsheet.  Rotate the process through all emails in the roster so we end up with a column of the links. Related How can we NOT record, but on the fly disregard responses not matching an already existing roster Show URL used to edit responses from a Google Form in a Google Spreadsheet by using a script Can I auto-fill an answer on a form edit URL?
How can one auto create pre-filled URLs with registered addresses from a roster
google spreadsheets;google forms;automation
Short answerYes, it's possible to automate the workflow but with slight changes. This answer assumes that the OP is using a consumer account instead of a Google Apps for Work of Google Apps for Education account.ExplanationFirst StepCreate and fill-in with one of the email addresses, a single option checkbox question. This could be the first question of the form.REMARK: If you want that to use a unique option to prevent that the student change it, then you will need to create a new form for each student. To automate this you will need to use Google Apps Script or an add-on. This was left out of this answer as it will make it too long for the Q&A model of this site.Checkboxes are used to allow multiple option selection, radio buttons are used to allow to select only one option but both will show all the email addresses and this could take a lot of space. Instead of using a checkbox/radio button, consider to use a dropdown list as the list of all email address will be displayed only when the user click the dropdown button.If the list has hundreds of email addresses, instead of a dropdown use text question to make the form load faster.Second StepGenerate a pre-filled link of the form with the above mentioned email address from the roster.Pre-filled links use URL parameters with special ID for each question. To keep the things simple, get the link from the form at least to take on URL to be used as template.To get the link to be used as template follow the instructions of Prepopulate form answers - Google docs editors HelpThird stepAppend the generated pre-filled link to the Responses spreadsheet.  Assuming that the OP is referring to the roster spreadsheet, add a column to hold the pre-filled URL for each student.For a form with two questions, one for the email address and pre-filled, the pre-filled URL will look like the followinghttps://docs.google.com/forms/d/form_id/viewform?entry.29450426=name@example.comThe form id will look like the following1awKpg_diniayS6360kNXrcgihk36azQ3DJEaZqXDY7AThe pre-filled email field will look like the following:entry.29450426=name@example.comThe part between entry. and = could be different for each form, and obviously the email could be anyone as in this step the purpose is to find the URL to be used as template.Forth stepRotate the process through all emails in the roster so we end up with a column of the links.REMARK: In the automation terminology, instead of rotation the term used is iteration but also could be referred to this kind of task as doing a loop or looping through....There are several ways to automate this. You could use formulas, Google Apps Script and Add-ons. Using a formula.In this step, the pre-filled URL corresponding to each student will be generated.In the roster spreadsheet, assuming that the first row holds the column headers and the column B holds the student email addresses, in the new column add the following formula in the cell in the second row=https://docs.google.com/forms/d/form_id/viewform?entry.29450426=&B2Then fill down as necessary.REMARKS:The following formula will fill the required cells, but it requires that the there aren't data below the students data range.=FILTER(    https://docs.google.com/forms/d/form_id/viewform?entry.29450426=&B2:B,    LEN(B2:B) )Using add-onsI don't think that there is an add-on that implement the whole workflow, so it's very likely that could be necessary to use several or to mix formulas, scripts and add-ons.One of the add-ons that could be helpful is FormMule. It's a very popular addon among teachers that could be used to send the pre-filled form URL that correspond to each student.FormMule - Google+ CommunityFormMule - AddonUsing Google Apps Script (GAS)As this could require a very long explanation for someone that doesn't know the basic this be excluded of this answer.