LessonStep: Fill in the blank format

[ceolinwill]

LessonStep

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1. Add new kind: fill_the_blank
2. Create a new changeset for fill_the_blank steps
3. Content shouldn't be required for fill_the_blank kind
4. Add new segments field (list)
5. segments field should be required for fill_the_blank
6. Migration: Allow content to be null

StepOption

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1. Create new changeset for fill_the_blank steps
2. Add segment field (int)
3. Fill the blank changeset: Cast only segment, title, and lesson_step_id

Editor: Fill in the blank

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1. Add the fill_the_blank kind
2. Automatically add 3 example segments
3. Automatically add two options
4. One option should be linked to a segment
5. Option associated with a segment should use the segment's index
6. When making a segment empty, adds an option associated with it
7. When adding content to an empty segment, remove its associated
8. When deleting an option associated with a segment, also remove the segment
9. When deleting a segment, also delete its option if it has one
10. When deleting a segment, update option segment index
11. List segments
12. Empty segments should have a different decorator
13. Display a + button to add a new segment
14. Allow to edit segments
15. Allow to delete segments
16. List options for fill in the blank steps
17. Edit options for fill in the blank steps (see current segment)

Play: Fill in the blank

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1. Display segments
2. Display empty spaces for empty segments
3. When an option is clicked it's added to the next empty segment
4. When an option is clicked on a segment, it's removed from that segment
5. Submit: Correct: Must match the correct segments
6. Submit: Error: When at least one segment doesn't match
7. Submit: Error: Feedback: Display both the answer and the correct sentence
8. Submit: Double check user selection

Tasks

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1. Make sure score is properly calculated for fill_the_blank steps

Dashboard

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1. Properly display user selections for fill_the_blank steps